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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).
DD1991 posted a topic in General Fossil DiscussionThe 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
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
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