SDAG Monthly Meeting
Wednesday, December 17, 2014
The San Diego Natural History Museum
1788 El Prado
San Diego, CA 92101
Located in Balboa Park, the SDNHM is near the intersection of Park Boulevard and Village Place, just south of the San Diego Zoo.
Enter through the grand entrance on the North side, facing the large Morton Bay Fig tree.
Menu: Deluxe Mexican Buffet, Cash Bar
Cost: $40.00 for non-members, $35.00 for members, $25.00 for students
if pre-registered by the deadline, $5 extra if you did not make a reservation.
Click the SDAG member checkbox on the reservation form if you are a member.
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no later than NOON, Monday, December 15th.
RESERVATIONS CANNOT BE ACCEPTED AFTER Monday at noon.
Late reservations/cancellations are preferred over walk-ins or no-shows.
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As a new payment option, there will be a phone credit card reader at the meeting.
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Speaker: Dr. Tom Deméré
"The recovery of late Oligocene vertebrate fossils in south Carlsbad: Implications for the geologic history of Paleogene strata in northern San Diego County."
Paleogene strata exposed along the coastal plain of northern San Diego County have traditionally been assigned to either the La Jolla Group or
the Santiago Formation, both typically considered to be of Eocene age.
However, since 1994 paleontological evidence has emerged that clearly demonstrates the occurrence of Oligocene fossils in portions of this
Paleogene stratigraphic sequence.
These fossils have primarily been recovered from temporary exposures at a variety of residential and roadway construction project sites in Oceanside.
Additional fossils have been recovered from sea cliff exposures in Carlsbad, and include well-preserved skulls and jaws of the diminutive oreodont,
This distinctive vertebrate fossil is also known from the Otay Formation in Chula Vista and represents an index fossil of the Early Arikareean
North American Land Mammal Age (Late Oligocene, ~28-30 Ma).
As its generic name implies, Sespia californica also occurs in the Oligocene portion of the Sespe Formation in Ventura County.
Stratigraphically, the sedimentary rocks containing Oligocene fossils in Oceanside lie above strata containing middle and upper Eocene vertebrate
fossils and below strata of the middle Miocene San Onofre Breccia.
The general strike of these Paleogene and Neogene beds is N-S, with a homoclinal westerly dip that in some areas reaches 20 degrees.
The overall stratigraphic sequence closely resembles middle Paleogene and Neogene sequence in southern Orange County, where
Eocene strata mapped as the Santiago Formation are overlain by Oligocene strata that are mapped as Sespe-Vaqueros Undifferentiated,
which in turn are overlain by middle Miocene Strata mapped as San Onofre Breccia.
Tom attended San Diego State University (BS Geology), USC (MS Geology) and UCLA (Ph.D. Biology).
After an initial period working in the petroleum industry, Tom moved to the San Diego Natural History Museum where he has been employed since 1979.
He is currently Curator of the Department of Paleontology, where he occupies the Joshua L. Baily, Jr.
Chair of Paleontology. Tom's research interests are in Cenozoic paleontology and geology of Southern California and Baja California.
His invertebrate paleontological work has concentrated on Plio-Pleistocene molluscan biostratigraphy, paleoecology, and taphonomy.
His vertebrate paleontological work focuses on the evolutionary history of marine mammals (pinnipeds and cetaceans).
In pursuing this line of research Tom is involved with field investigations to discover new fossils of pinnipeds and cetaceans, with anatomical
investigations of both fossil and Recent marine mammals, and with functional analysis of feeding and locomotor anatomical features.
Since the early 1980s, Tom has been deeply involved with conservation of the rich and unique paleontological resources of Southern California.
In this regard, he has helped put together guidelines for determining the paleontological resource sensitivity of geological deposits that occur in the region.
Tom has also headed up the Museum's Department of PaleoServices, whose goal it is to mitigate negative construction-related impacts to sensitive
Typically, mitigation involves monitoring of construction activities, discovery and salvaged of unearthed fossil remains, preparation of salvaged fossils,
identification and curation of prepared fossils, and storage of curated fossils in perpetuity for future generations.
Over the past 34 years this effort has resulted in the recovery of countless rare and/or unique fossil remains, many of which are, or have been,
displayed for the public at the Museum.
As an adjunct faculty at nearby SDSU in both the Department of Geological Sciences and Department of Biology, Tom has had the opportunity to
advise a number of undergraduate and graduate students on various paleontological projects.
Tom's involvement with students increased in 2009 when he began teaching courses (Geobiology and Historical Geology) in the Department of
Geological Sciences, where he was an undergraduate student in the 1970s.
Upcoming SDAG meetings - 2015
January 21: Reena Deutsch - The Impossible Landslide (Carrizo Gorge's 1932 Goat Canyon Disaster)
February 18: Chuck Houser - Calcite
Meetings are usually scheduled for the 3rd Wednesday evening of the month. Meeting information on this website is normally updated the second week of the month.
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