Not an arrowhead yet possibly an effigy of some kind?

I found this while shell and rock hunting in Malaga cove, Palos verdes a few years back. The markings on it have always impressed me. Thinking of was an old shell only I never looked further into this piece until now. The area is known for artifacts from Tongva/Gabriello people.

The entire area is rich in history, where even tusks from mammoths have been found. With that being said, I’m super curious what this looks like to some and if anyone has ever seen anything similar? Or is just an old broken marked up piece of a shell?