New Members Mossrute Posted September 4, 2023 New Members Share Posted September 4, 2023 Hi, I am new to this forum. I have a degree in biology and a degree in art. I specialized in zoology and my final project was about cephalopod evolution. I am an oil painter, scientific illustrator, and calligrapher. I have limited experience with fossils. I have actually never posted on any forum before, so apologies if I am not doing something correctly. I recently found this odd formation in a rock at the beach. I am not sure what it is. Has anyone seen something like this before? Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 4, 2023 Share Posted September 4, 2023 (edited) Welcome to the Forum. Tell us about the rock and where you found it. Can you scratch it with a metal blade? Does it fizz in acid? A wild guess would be a bivalve in diatomite from the Miocene Monterey Group because it is a commonly found white rock layer found along coastal California. Use the map of California geology: https://maps.conservation.ca.gov/cgs/gmc/ Edited September 4, 2023 by DPS Ammonite 1 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
New Members Mossrute Posted September 4, 2023 Author New Members Share Posted September 4, 2023 Thank you. I found it in Goleta at the beach mixed in with many other rocks. a metal blade easily scratches it. vinegar reacts mildly (bubbles). Yes, according to the map it is Miocene, marine sedimentary. Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 4, 2023 Share Posted September 4, 2023 Since it fizzes in acid it is limestone or lime rich rock and not siliceous diatomite. See if you can narrow down the formation: https://pubs.usgs.gov/of/2007/1403/downloads/pdf/OF07-1403_map.pdf My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
New Members Mossrute Posted September 4, 2023 Author New Members Share Posted September 4, 2023 I ended up having to use a different map (attached). Goleta Geo Map .pdf It was very difficult to pinpoint the location. The map does not seem accurate when compared to google earth. However. I am fairly certain I figured it out: I think it is "Tmm." Here is a screen shot of the description from the PDF: If not "Tmm" then it is probably "Qls", but more likely the former. Link to comment Share on other sites More sharing options...
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