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Hey guys, I've been off the radar for awhile .. work you know .. been working on Siggraph for those of you who are familiar with software development. Just wanted to start a new topic here .. This one is right at 3.00" - 7.62cm C. carcharias Bahia Inglesa Formation South of Caldera Provincia Copiapo III Regio de Atacama Chile
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Found this recently when grubbing around my San Diego Formation (Pliocene) riverbed that is full of marine fossils. Most bones I have found are from baleen whales, or 'other' marine mammals. This bone fossil seems somewhat different than other whale (or other cetacean?) bones I have found. It is smaller.. which doesn't mean much, but the ratio of inner to outer cortex maybe also seems different. I do not know exactly what distinguishing qualities are that would allow one to differentiate from something like a bird, or dolphin. I previously found a manatee rib, but was only sure of this because a curator at the Nat helped ID that. Two images are of the embedded bone, the next two are of a presumably baleen whale bone that was also found that day.
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From the album: Kandeek
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Took this photo of an unnamed eschrichtiid from the Pliocene San Diego Formation of San Diego County in March 2019. Until the 2000s, the fossil record of gray whales was confined to the Pleistocene, but thanks to the work of Michelangelo Bisconti, it is apparent that gray whales emerged about the same time as the oldest rorquals (Eschrichtioides was long considered a balaenopterid, but eventually recognized as a gray whale relative).
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Balaenid from San Diego Formation of San Diego County, California
DD1991 posted a topic in General Fossil Discussion
The balaenid specimen SDNHM 43880 I photographed at the San Diego Natural History Museum in December 2017 was once referred to Balaenula, but Churchill et al. (2012) recovered it as sister to the bowhead whale rather the right whales and Balaenula, and recent erection of Archaeobalaena dosanko for the one balaenid specimen from Japan previously referred to Balaenula makes clear that the previous referral of SDNHM 43880 was untenable. However, it is unclear whether SDNHM 43880 is a new genus and species or alternatively a new Balaena species due to the cladistic position of SDNHM 43880 obtained by Churchill et al. (2012). Churchill, M., Berta, A. and Deméré, T. (2012), The systematics of right whales (Mysticeti: Balaenidae). Marine Mammal Science, 28: 497-521. doi:10.1111/j.1748-7692.2011.00504.x-
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Here is a nice little gastropod cluster on the matrix that was rescued from a construction site along Reynard Way in San Diego. I think they are in the family Naticidae and are possibly Polinices galianor. Anyone have any thoughts? I'd love to nail it down more specifically if possible. Naticidae "Reynard Way" ~3-1.5Mya Pliocene to Early Pleistocene San Diego Formation San Diego County, CA Kingdom: Animalia Phylum: Mollusca Class: Gastropoda -- Subclass: Caenogastropoda Order: Littorinimorpha Family: Naticidae Genus: Favor Polinices? Species: Galianor