I found this rock on Ocean Beach in San Francisco. I have In the same area over the past few weeks recovered several fragments of Sand Dollar fossils probably about two million years old, according to a local geology/oceanology professor who recognized them right away. I am wondering if this rock might be a turtle scute as I have seen similar looking samples online that were Holocene turtle scutes. The sand dollars were the first fossils I’ve ever found outside of fossilized clams so I have no problem if this is just a rock.
Many thanks in advance for the expert guidance and help.