Naterskater Posted August 26 Share Posted August 26 (edited) I found this shell at half moon bay in Northern California, It washed up on shore. Im pretty sure it’s a fossil - I’m wondering what type of shell it is, and possibly how old it could be? Any help would be much appreciated! Approx dimensions: L3” x W2.5” x H1.5” Edited August 26 by Naterskater More tags Link to post Share on other sites
Tidgy's Dad Posted August 26 Share Posted August 26 Maybe a species of Crepidula? Here's an article on the geology by our own @Boesse https://ucmp.berkeley.edu/2010/05/marine-vertebrate-paleontology-in-half-moon-bay/#:~:text=In the Santa Cruz area%2C fossils of sharks%2C rays%2C,spot in Half Moon Bay. So, it's Miocene / Pliocene about 7 to 2.5 million years old. 2 Link to post Share on other sites
Naterskater Posted August 26 Author Share Posted August 26 Thank you! Link to post Share on other sites
Boesse Posted August 26 Share Posted August 26 Indeed, a Crepidula princeps from the Purisima Fm. 1 Link to post Share on other sites
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