HomeMy WebLinkAboutTechnical Report 04 - Paleo Resources Inventory
August 24, 2022 12919
Subject: Paleontological Resources Inventory Report for the Otay Ranch Town Center Redevelopment
Project, City of Chula Vista, San Diego County, California
Mr. Tony Pauker
Brookfield Properties
733 8th Avenue
San Diego, CA 92101
Dear Mr. Pauker:
This letter documents the results of the paleontological resources inventory in support of the Otay Ranch Town
Center Redevelopment project (project). The project includes changes to existing entitlements to allow mixed-
use/residential development on a portion of a 87.25-acre site (Assessor’s Parcel Numbers 643-061-02, 04, 05,
08, and 11), including 840 residential units, in the eastern portion of the City of Chula Vista (City), within the Otay
Ranch General Development Plan (GDP) Area (Figure 1) (Figures are provided at the end of this memorandum).
More specifically, the site is located immediately east of State Route 125 (SR-125) between Birch Road and Olympic
Parkway. The site is within the Sectional Planning Area (SPA) known as the Freeway Commercial SPA. The City of
Chula Vista (City) is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA).
In accordance with CEQA, the County of San Diego, and the Society of Vertebrate Paleontology (SVP 2010)
guidelines, Dudek performed a paleontological resources inventory for the project. The inventory consisted of a San
Diego Natural History Museum (SDNHM) paleontological records search and a review of geological mapping and
geological and paleontological literature, The SDNHM reported one fossil locality within the project site and 25 fossil
localities within a one-half (0.5) mile radius buffer from the same geological unit that underlies the project site.
Since the project site is currently developed, no survey for paleontological resources was conducted.
Even though the project site has been developed, there is a potential to encounter intact subsurface paleontological
resources below the level of previous ground disturbance and artificial fill. As such, a paleontological monitoring
program, which includes the preparation and implementation of a Paleontological Resources Impact Mitigation
Program (PRIMP), is necessary to reduce impacts to any potential paleontological resources onsite.
1 Project Location
Otay Ranch lies within the East Planning Area of the City of Chula Vista. The East Planning Area is bordered by
Interstate 805 (I-805) to the west, San Miguel Mountain and SR-54 to the north, the Otay Reservoir and the Jamul
foothills to the east, and the Otay River Valley to the south (Figure 1). The SPA Plan is located in the northeastern
portion of the Otay Valley Parcel of the 22,899-acre Otay Ranch GDP project area. The project site, which comprises
the northwestern portion of FC-1, is located immediately east of SR-125, west of Eastlake Parkway, between Ring
Road, and Birch Road.
12919] 2 AUGUST 2022
2 Project Description
The project includes residential and mixed-use/residential in the northwest quadrant of FC-1 by introducing 840
residential units within the Town Center site. The northwest portion of the FC-1 site (approximately 14.77 acres)
would be rezoned to Mixed-Use/Residential (MU/R). The SPA Amendment would also reduce existing commercial
entitlements on the entirety of the FC-1 site from 960,000 square feet to 816,000 square feet.
FC-1 is 87.25 acres and is currently developed with commercial uses known as the Otay Ranch Town Center (Town
Center) (Figure 1). Existing land uses at the Otay Ranch Town Center are primarily commercial in nature including
retail, food and beverage, entertainment, and community-serving land uses.
3 Paleontological Resources
Paleontological resources are the remains or traces of plants and animals that are preserved in earth’s crust, and per
the Society of Vertebrate Paleontology ([SVP] 2010) guidelines, are older than written history or older than approximately
5,500 years. They are limited, nonrenewable resources of scientific and educational value, which are afforded protection
under state laws and regulations. This analysis also complies with guidelines and significance criteria specified by SVP
(2010). Table 1 provides definitions for high, moderate, low, marginal, and no paleontological resource potential, or
sensitivity, as set forth in and in agreement with the County of San Diego’s (2009) Guidelines for Determining
Significance: Paleontological Resources.
Table 1. Paleontological Resources Sensitivity Criteria
Resource
Sensitivity/Potential Definition
High High resource potential and high sensitivity are assigned to geologic
formations known to contain paleontological localities with rare, well
preserved, critical fossil materials for stratigraphic or paleoenvironmental
interpretation, and fossils providing important information about the
paleoclimatic, paleobiological and/or evolutionary history (phylogeny) of
animal and plant groups. In general, formations with high resource
potential are considered to have the highest potential to produce unique
invertebrate fossil assemblages or unique vertebrate fossil remains and
are, therefore, highly sensitive.
Moderate Moderate resource potential and moderate sensitivity are assigned to
geologic formations known to contain paleontological localities. These
geologic formations are judged to have a strong, but often unproven,
potential for producing unique fossil remains (Deméré and Walsh 1993).
Low Low resource potential and low sensitivity are assigned to geologic
formations that, based on their relatively young age and/or high-energy
depositional history, are judged unlikely to produce unique fossil remains.
Low resource potential formations rarely produce fossil remains of scientific
significance and are considered to have low sensitivity. However, when
fossils are found in these formations, they are often very significant
additions to our geologic understanding of the area.
TO: TONY PAUKER
SUBJECT: PALEONTOLOGICAL RESOURCES INVENTORY REPORT FOR THE OTAY RANCH TOWN CENTER
REDEVELOPMENT PROJECT, CITY OF CHULA VISTA, SAN DIEGO COUNTY, CALIFORNIA
12919] 3 AUGUST 2022
Marginal Marginal resource potential and marginal sensitivity are assigned to
geologic formations that are composed either of volcaniclastic (derived
from volcanic sources) or metasedimentary rocks, but that nevertheless
have a limited probability for producing fossils from certain formations at
localized outcrops. Volcaniclastic rock can contain organisms that were
fossilized by being covered by ash, dust, mud, or other debris from
volcanoes. Sedimentary rocks that have been metamorphosed by heat
and/or pressure caused by volcanoes or plutons are called
metasedimentary. If the sedimentary rocks had paleontological resources
within them, those resources may have survived the metamorphism and
still be identifiable within the metasedimentary rock, but since the
probability of this occurring is so limited, these formations are considered
marginally sensitive.
No Sensitivity No resource potential is assigned to geologic formations that are composed
entirely of volcanic or plutonic igneous rock, such as basalt or granite, and
therefore do not have any potential for producing fossil remains. These
formations have no paleontological resource potential, i.e., they are not
sensitive.
Source: County of San Diego 2009.
4 Regulatory Framework
4.1 California Environmental Quality Act
The CEQA Guidelines require that all private and public activities not specifically exempted be evaluated against the
potential for environmental damage, including effects to paleontological resources. Paleontological resources, which are
limited, nonrenewable resources of scientific, cultural, and educational value, are recognized as part of the environment
under these state guidelines. This study satisfies project requirements in accordance with CEQA (13 PRC [Public
Resources Code], 21000 et seq.).
Paleontological resources are explicitly afforded protection by CEQA, specifically in Section VII(f) of CEQA Guidelines
Appendix G, the “Environmental Checklist Form,” which addresses the potential for adverse impacts to “unique
paleontological resource[s] or site[s] or … unique geological feature[s].” This provision covers fossils of signal
importance – remains of species or genera new to science, for example, or fossils exhibiting features not previously
recognized for a given animal group – as well as localities that yield fossils significant in their abundance, diversity,
preservation, and so forth.
4.2 PRC Section 5097.5
The PRC Section 5097.5 (Stats 1965, c 1136, p. 2792) regulates removal of paleontological resources from state
lands, defines unauthorized removal of fossil resources as a misdemeanor, and requires mitigation of disturbed
sites.
TO: TONY PAUKER
SUBJECT: PALEONTOLOGICAL RESOURCES INVENTORY REPORT FOR THE OTAY RANCH TOWN CENTER
REDEVELOPMENT PROJECT, CITY OF CHULA VISTA, SAN DIEGO COUNTY, CALIFORNIA
12919] 4 AUGUST 2022
4.3 City of Chula Vista Regulations
4.3.1 City of Chula Vista’s General Plan
The environmental chapter of the City of Chula Vista General Plan (Chapter 9, Section 3.1.10) specifically addresses
potential impacts to non-renewable paleontological resources and outlines policies to mitigate negative impacts
(City of Chula Vista 2005). The objective and policies protecting paleontological resources are outlined below:
Objective E-10: Protect important paleontological resources and support and encourage public education and
awareness of such resources.
Policy E-10.1: Continue to assess and mitigate the potential impacts of private development and public facilities
and infrastructure to paleontological resources in accordance with the California Environmental Quality Act.
Policy E-10.2: Support and encourage public education and awareness of local paleontological resources, including
the establishment of museums and educational opportunities accessible to the public.
5 Methods
5.1 Geological Map and Literature Review
Published geological maps (Kennedy 1975; Kennedy and Tan 2008) and published and unpublished reports were
reviewed to identify geological units on the site and determine their paleontological sensitivity.
5.2 Paleontological Records Search
A paleontological records search request was sent to the SDNHM on July 20, 2022. The purpose of the museum
records search is to determine whether there are any known fossil localities in or near the project site, identify the
sensitivity of geological units present within the project site, and aide in determining whether a paleontological
mitigation program is warranted to avoid or minimize potential adverse effects of construction on paleontological
resources.
6 Results
6.1 Geological Map Review, Literature Review, and Records
Search
The project site lies within the Peninsular Ranges Geomorphic Province (California Geological Survey, 2002). This
province extends from the tip of the Baja California Peninsula to the Transverse Ranges (the S an Gabriel and San
Bernardino Mountains) and includes the Los Angeles Basin, offshore islands (Santa Catalina, Santa Barbara, San
Nicholas, and San Clemente), and continental shelf. The eastern boundary is the Colorado Desert Geomorphic
Province (California Geological Survey 2002; Morton and Miller 2006). The ancestral Peninsular Ranges were
TO: TONY PAUKER
SUBJECT: PALEONTOLOGICAL RESOURCES INVENTORY REPORT FOR THE OTAY RANCH TOWN CENTER
REDEVELOPMENT PROJECT, CITY OF CHULA VISTA, SAN DIEGO COUNTY, CALIFORNIA
12919] 5 AUGUST 2022
formed by uplift of plutonic igneous rock resulting from the subduction of the Farallon Plate underneath the North
American Plate during the latter portion of the Mesozoic era (approximately 125 to 90 million years ago [mya])
(Abbott 1999).
According to surficial geological mapping at a 1:100,000 scale and the results of a paleontological records search
conducted by the SDNHM (Confidential Appendix A), the project site is underlain by the late Oligocene
(approximately 28 - 23 mya) Otay Formation (map unit To) (Todd et al. 2004; Cohen et al. 2022).
The paleontological records search results letter from the SDNHM was received on July 28, 2022. The SDNHM
reported one fossil locality from within the boundaries of the project site, and 25 fossil localities within a one-half
mile radius of the project from the same geological unit mapped within the project site. Several of the fossil localities
located outside of the project site boundaries are within 500 meters (~less than one third of a mile) of the project
site boundaries (Confidential Appendix A). The following paragraphs summarize the paleontological records search
results and geological unit present within the project site.
6.1.1 Otay Formation
First named by Artim and Pinckney (1973) for alluvial- and fluvial-derived continental sedimentary rocks cropping
out in southwestern San Diego County, the late Oligocene Otay Formation consists of three informal members as
assigned by Deméré and Walsh (1991). The basal member, the “conglomerate member” or “fanglomerate
member”, which is not known to commonly yield fossils and is assigned moderate paleontological sensitivity, is
composed of subangular to subrounded boulders and cobbles in a gritstone matrix (Deméré and Walsh 1991;
Confidential Appendix A). The gritstone member overlies the conglomerate member and is known to yield significant
paleontological resources but not abundantly. The gritstone member is also assigned moderate paleontological
sensitivity (Deméré and Walsh 1991; Confidential Appendix A). The upper sandstone-claystone member of the Otay
Formation has produced many significant paleontological resources and is assigned high paleontological sensitivity
(Deméré and Walsh 1991; Confidential Appendix A).
The SDNHM reported 26 fossil localities within the 0.5-mile radius buffer zone for the project site. Of these localities,
one (SDNHM 5593) was discovered in the southwestern portion of the project site and yielded ostracods and
freshwater pulmonate snails (Confidential Appendix A). Other nearby localities, some of which are located within
500 meters of the project site, produced fossil terrestrial vertebrates, including cranial bones, postcranial bones,
teeth, and impressions of plants, fragmentary pulmonate snails and eggshells, turtles, lizards, birds, and small and
large mammals (Confidential Appendix A). The SDNHM suggested assigning all members of the Otay Formation
high paleontological sensitivity since available geological mapping does not subdivide the formation into members.
7 Summary and Management Recommendations
Dudek’s review of records search data, geological mapping, geological and paleontological literature revealed the
project site has high paleontological sensitivity and there is one existing fossil locality within the project site and
several within approximately 500 meters of it. Given the high potential for the Otay Formation to produce
paleontological resources during grading for site preparation, trenching for utilities, and augering, a qualified
paleontologist should be retained for the project who meets or exceeds the qualifications set forth in the SVP (2010)
TO:TONY PAUKER
SUBJECT: PALEONTOLOGICAL RESOURCES INVENTORY REPORT FOR THE OTAY RANCH TOWN CENTER
REDEVELOPMENT PROJECT, CITY OF CHULA VISTA, SAN DIEGO COUNTY, CALIFORNIA
12919] 6 AUGUST 2022
guidelines. The qualified paleontologist shall prepare and adopt a PRIMP prior to the commencement of project-
related earthmoving activities. Implementation of a paleontological mitigation program would reduce any potential
impacts to below a level of significance for paleontological resources.
Prior to the issuance of grading permits, the applicant shall provide written confirmation to the City of Chula Vista
that a qualified paleontologist has prepared a PRIMP and has been retained to carry out the PRIMP. A qualified
paleontologist is defined as an individual with an MS or PhD in paleontology or geology who is familiar with
paleontological procedures and techniques and has expertise in local geology, stratigraphy, and biostratigraphy.
The PRIMP shall be consistent with the SVP (2010) guidelines and contain the following components:
▪ Introduction to the project, including project location, description grading activities with the potential to impact
paleontological resources, and underlying geologic units.
▪ Description of the relevant laws, ordinances, regulations, and standards pertinent to the project and potential
paleontological resources.
▪ Requirements for the qualified paleontologist to attend the pre-construction meeting and provide worker
environmental awareness training at the pre-construction meeting as well as at the jobsite the day grading
is to be initiated. In addition, the qualified paleontologist shall inform the grading contractor and City
Resident Engineer of the paleontological monitoring program methodologies.
▪ Identification of where paleontological monitoring of excavations impacting the Otay Formation is required
within the project site based on construction plans and/or geotechnical reports.
▪ Procedures for adequate paleontological monitoring (including necessary monitoring equipment), methods
for treating fossil discoveries, fossil recovery procedures, and sediment sampling for microvertebrate
fossils, including the following requirements:
- A paleontological monitor shall be on site at all times during the original cutting of previously
undisturbed sediments of highly sensitive geologic units (the Otay Formation) to inspect cuts for
contained fossils. (A paleontological monitor is defined as an individual who has experience in the
collection and salvage of fossil materials.) The paleontological monitor shall work under the direction
of a qualified paleontologist.
- Paleontological monitoring is not required in areas underlain by artificial fill unless grading activities
are anticipated to extend beneath the veneer of fill and impact underlying Otay Formation deposits.
- If fossils are discovered, the qualified paleontologist and/or paleontological monitor shall recover them.
The paleontologist (or paleontological monitor) shall be allowed to temporarily direct, divert, or halt
grading within 50 feet of the resource to allow recovery of fossil remains. Because of the po tential for
the recovery of small fossil remains, it may be necessary in certain instances, and at the discretion of
the qualified paleontologist, to set up a screen-washing operation on the project site. Alternatively,
sediment samples can be collected and processed off-site.
▪ Paleontological reporting, and collections management:
- Prepared fossils along with copies of all pertinent field notes, photos, maps, and the final
paleontological monitoring report discussed below shall be deposited in a scientific institution with
paleontological collections such as the San Diego Natural History Museum within 90 days of completion
of monitoring unless the City and the qualified paleontologist determine the extent of fossils recovered
will require more preparation, stabilization, and/or curatorial time. Any curation costs shall be paid for
by the applicant.
TO: TONY PAUKER
SUBJECT: PALEONTOLOGICAL RESOURCES INVENTORY REPORT FOR THE OTAY RANCH TOWN CENTER
REDEVELOPMENT PROJECT, CITY OF CHULA VISTA, SAN DIEGO COUNTY, CALIFORNIA
12919] 7 AUGUST 2022
o A final paleontological monitoring report shall be completed. This report shall include discussions of
the methods used, stratigraphy exposed, fossils collected, and significance of recovered fossils, and
shall be submitted to the designated scientific institution within 90 days of the completion of monitoring
unless the City and the qualified paleontologist determine the extent of fossils recovered will require
more preparation, stabilization, and/or curatorial time.
Should you have any questions relating to this report and its findings please contact Michael Williams
(mwilliams@dudek.com) or Sarah Siren (ssiren@dudek.com).
Sincerely,
____________________________________
Michael Williams, Ph.D.
Senior Paleontologist
Att.: Figure 1, Regional Location Map
Appendix A, Confidential SDNHM Paleontological Records Search Results
cc: Sarah Siren, Alexandra Martini, Dudek
TO: TONY PAUKER
SUBJECT: PALEONTOLOGICAL RESOURCES INVENTORY REPORT FOR THE OTAY RANCH TOWN CENTER
REDEVELOPMENT PROJECT, CITY OF CHULA VISTA, SAN DIEGO COUNTY, CALIFORNIA
12919] 8 AUGUST 2022
References
Abbott, P.L., 1999. The Rise and Fall of San Diego: 150 Million Years of History Recorded in Sedimentary Rocks.
San Diego, California: Sunbelt Publications.
California Geological Survey. 2002. California Geomorphic Provinces: Note 36. 4 pp.
City of Chula Vista. 2005. City of Chula Vista General Plan, Environmental Element, Electronic resource,
https://www.chulavistaca.gov/home/showdocument?id=9341. Accessed on March 15, 2019.
Cohen, K.M., S.C. Finney, P.L. Gibbard, and J.-X. Fan. 2022. “The ICS International Chronostratigraphic Chart.”
Episodes 36: 199–-204. 2013; updated. Available at:
https://stratigraphy.org/ICSchart/ChronostratChart2021-05.jpg.
County of San Diego. 2009. Guidelines for Determining Significance: Paleontological Resources. San Diego,
California: County of San Diego Land Use and Environment Group, Department of Planning and Land Use,
Department of Public Works. Approved March 19, 2007, Modified January 15, 2009.
Deméré, T.A. and S.L. Walsh. 1993. Paleontological Resources, County of San Diego. Prepared for the San Diego
Planning Commission, pp. 1–68. Revised 07 April 2003.
Kennedy, M.P. 1975. “Geology of the San Diego Metropolitan Area, California. Section A Western San Diego
Metropolitan Area.” California Division of Mines and Geology, Bull. 200: 9–39.
Morton, D.M. and F.K. Miller. 2006. Geologic Map of the San Bernardino and Santa Ana 30-minute x 60-minute
Quadrangles, California, Geology and Description of Map Units, Version 1.0: U.S. Geological Survey, Open-
File Report OF-2006-1217. 194 pp.
SVP (Society of Vertebrate Paleontology). 2010. Standard Procedures for the Assessment and Mitigation of
Adverse Impacts to Paleontological Resources. https://vertpaleo.org/Membership/Member-
Resources/SVP_Impact_Mitigation_Guidelines.aspx.
Todd, V.R., Alvarez, R.M., and Techni Graphic Systems, Inc., 2004, Preliminary geologic map of the El Cajon 30' X
60' quadrangle, southern California: U.S. Geological Survey, Open-File Report OF-2004-1361, scale
1:100,000.
TO: TONY PAUKER
SUBJECT: PALEONTOLOGICAL RESOURCES INVENTORY REPORT FOR THE OTAY RANCH TOWN CENTER
REDEVELOPMENT PROJECT, CITY OF CHULA VISTA, SAN DIEGO COUNTY, CALIFORNIA
Project Location
Otay Ranch Town Center Redevelopment Project
SOURCE: Bing Maps 2022
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Appendix A
SDNHM Records Search Results (Confidential)
28 July 2022
Michael Williams
Dudek
605 Third Street
Encinitas, CA 92024
RE: Paleontological Records Search – Otay Ranch Town Center Redevelopment
Dear Dr. Williams:
This letter presents the results of a paleontological records search conducted for the Otay Ranch
Town Center Redevelopment project (Project), located in the City of Chula Vista, San Diego County,
California. The Project site is located at the current Otay Ranch Town Center and is bordered to north by
Transit Guideway, to the east by Eastlake Parkway, to the south by Birch Road, and to the west by
northbound State Route (SR) 125 (South Bay Freeway).
Methods
A review of published geological maps covering the Project site and surrounding area was
conducted to determine the specific geologic units underlying the Project site. Each geologic unit was
subsequently assigned a paleontological resource sensitivity (Deméré and Walsh, 1993). In addition, a
search of the paleontological collection records housed at the San Diego Natural History Museum
(SDNHM) was conducted in order to determine if any documented fossil collection localities occur at the
Project site or within the immediate surrounding area.
Results
Published geological reports (e.g., Todd, 2004) covering the Project area indicate that the
proposed Project has the potential to impact the late Oligocene-age Otay Formation. This geologic unit
and its paleontological sensitivity are summarized below.
The SDNHM has a total of 26 recorded fossil localities that lie within a half mile of the Project
site, all of which are from the Otay Formation and are discussed in greater detail below. Several of these
localities lay in close proximity to the Project site (within 500 feet), and one (SDSNH Locality 5593) lies
within the Project boundaries. A map (Figure 1) and list (Appendix A) of the fossil localities are attached
at the end of this report.
Otay Formation – Fluvial deposits of the late Oligocene-age (approximately 29 million years
old) Otay Formation underlie the entire Project site. The SDNHM has 26 recorded fossil localities from
the Otay Formation within a half-mile radius of the Project site, one of which (SDSNH Locality 5593) is
located in the southwestern portion of the Project site. The locality was discovered in a 2-foot thick,
purple, massive claystone at an elevation of 597 feet above sea level during mass grading for the
McMillin Otay Ranch Village 12 development, and produced internal and external molds of shells of
pulmonate freshwater snails and ostracods. The remaining 25 localities produced fossil teeth, jaws, and
postcranial elements of terrestrial vertebrates (e.g., turtles, lizards, marsupials, squirrels, mice, gophers,
hedgehog, camelids, the small deer-like artiodactyl Hypertragulus, and the oreodont Sespia californica);
Otay Ranch Town Center Redevelopment - Paleontological Records Search 2
bird bones, egg shells, and tracks; pulmonate snail shell fragments; and stem and leaf impressions of
flowering plants. The upper sandstone-mudstone unit of the Otay Formation has been assigned a high
paleontological sensitivity, while the lower fanglomerate and gritstone units have produced vertebrate
fossils at only a few localities and have been assigned a moderate paleontological sensitivity. However,
as these units are undifferentiated on existing geologic maps of the Project area, the entire formation
should be treated as having a high paleontological sensitivity.
Summary and Recommendations
The high paleontological sensitivity of the Otay Formation (Deméré and Walsh, 1993), as well as
the presence of fossil collection localities within the boundaries of and in close proximity to the Project
site, suggests the potential for construction of the proposed Project to result in impacts to
paleontological resources. Any proposed excavation activities that extend deep enough to encounter
previously undisturbed deposits of this geologic unit (i.e., below the depth of any previously imported
artificial fill or disturbed sediments present within the Project site) have the potential to impact the
paleontological resources preserved therein. If such excavation is required for Project construction,
implementation of a complete paleontological resource mitigation program during ground-disturbing
activities is recommended. The mitigation program must include, at a minimum, measures for
construction monitoring, fossil salvage and data recovery, laboratory preparation and curation of the
fossils at an appropriate regional repository, and production of a final paleontological mitigation report.
The fossil collection locality information contained within this paleontological record search
should be considered private and is the sole property of the San Diego Natural History Museum. Any use
or reprocessing of information contained within this document beyond the scope of the Otay Ranch
Town Center Redevelopment project is prohibited.
If you have any questions concerning these findings please feel free to contact me at
kmueller@sdnhm.org.
Sincerely,
Kirstin Mueller
Assistant Report Writer
San Diego Natural History Museum
Enc: Figure 1: Project map
Appendix A: List of SDSNH fossil localities in the vicinity of the Project
Otay Ranch Town Center Redevelopment - Paleontological Records Search 3
Literature Cited
Deméré, T.A., and S.L. Walsh. 1993. Paleontological Resources, County of San Diego. Unpublished
technical report prepared for the San Diego County Department of Public Works: 1–68.
San Diego Natural History Museum (SDNHM), unpublished paleontological collections data.
Todd, V.R. 2004. Preliminary Geologic Map of the El Cajon 30' x 60' Quadrangle, Southern California. U.S.
Geological Survey, Open-File Report 2004-1361.
Appendix A: Locality List
San Diego Natural History Museum
Department of Paleontology
1 of 1
Locality Number Locality Name Location Elevation (feet)Geologic Unit Era Period Epoch
4846 Winding Walk (Otay Ranch Village 11)City of Chula Vista, San Diego County, California 625 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
4933 Eastlake Parkway Extension City of Chula Vista, San Diego County, California 611 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5412 Winding Walk Phase 2 - micro site City of Chula Vista, San Diego County, California 644 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5413 Winding Walk Phase 2 - misc vert site City of Chula Vista, San Diego County, California 635 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5414 Winding Walk Phase 2 - Bird Trackways City of Chula Vista, San Diego County, California 623 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5593 McMillin Otay Ranch Village 12 City of Chula Vista, San Diego County, California 597 Otay Formation Cenozoic Paleogene late Oligocene
5594 McMillin Otay Ranch Village 12 City of Chula Vista, San Diego County, California 625 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5595 McMillin Otay Ranch Village 12 City of Chula Vista, San Diego County, California 622 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5734 Winding Walk Phase III City of Chula Vista, San Diego County, California 623 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5735 Winding Walk Phase III - Bird Egg Hill City of Chula Vista, San Diego County, California 618 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5736 Winding Walk Phase III City of Chula Vista, San Diego County, California 611 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5737 Winding Walk Phase III City of Chula Vista, San Diego County, California 594 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5739 Winding Walk Phase III - Bird Egg Hill City of Chula Vista, San Diego County, California 625 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
5743 Winding Walk Phase III City of Chula Vista, San Diego County, California 597 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
6838 Millenia at Otay Ranch City of Chula Vista, San Diego County, California 601 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
6839 Millenia at Otay Ranch - Camel Site City of Chula Vista, San Diego County, California 602 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
6840 Millenia at Otay Ranch City of Chula Vista, San Diego County, California 609 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
6841 Millenia at Otay Ranch City of Chula Vista, San Diego County, California 611 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
6842 Millenia at Otay Ranch City of Chula Vista, San Diego County, California 625 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
7386 Millenia at Otay Ranch City of Chula Vista, San Diego County, California 609 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
7392 Millenia Phase 2 City of Chula Vista, San Diego County, California 604 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
7589 Millenia Lot 2 Sudberry City of Chula Vista, San Diego County, California 600 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
7935 Suwerte at Otay Ranch City of Chula Vista, San Diego County, California 613 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
7936 Suwerte at Otay Ranch City of Chula Vista, San Diego County, California 615 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
7937 Pinnacle at Millenia City of Chula Vista, San Diego County, California 595 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene
7938 Pinnacle at Millenia City of Chula Vista, San Diego County, California 604 Otay Formation, sandstone-mudstone member Cenozoic Paleogene late Oligocene