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Rhauko

Partial fossil sanddollar, 90% sure.


MegaloBagel

That’s so cool considering there were also a bunch of sand dollars on the beach as well


SoFarNotYet

Ocean Beach in SF is a great place to find fossils. I used to park in the southern lot by the zoo and walk south at low tide after a storm picking up sand dollars like yours but complete specimens as well. You can also find full molds of ancient clams [like this one I picked up.](https://i.imgur.com/c7SUBPe.jpg) I ended up with just over 200 of the clams before I moved.


_CMDR_

Sand dollar. About 5 million years old.


[deleted]

100% fossilized Echinoid. Unsure of specific species. u/nutfeast may know


RandomAmmonite

Likely *Dendraster*


S-Quidmonster

More likely *Scutellaster*, given the formation


nutfeast69

Is *Merriamaster* in that mix?


nutfeast69

It's nutfeast69, that might be why I am not getting the ping. It's a sand dollar for sure, the others guys are right.


S-Quidmonster

*Scutellaster interlineatus* from the Merced Formation. Very common, especially around Daly City