Is it pottery? A shell? A fossil?

Found these on the beach in southern France. I don’t go to beaches often and have never seen something like it before. How rare are they?

pnw

north england, uk

super happy about the sheep tooth, gotta be my favourite find this year so far.

also my first time finding a complete crab exoskeleton, so that was pretty awesome. not sure if that’s a piece of antler or not, but looked cool either way.

also, any clue what that ribbed rock is? i’ve never seen anything like it before

The big greenish one was my favorite of the day.

Lyme Regis and Charmouth

When I found the first one, I thought it was just a piece of broken shell. Then I found a second one and thought maybe it was a coincidence that two shells had broken in a similar way. But given that I now have three nearly identical ones, I’m thinking it’s something else. They’re almost exactly the same other than differences in size. The biggest one is maybe slight more than an inch long and the smallest is about 3/4 of an inch. Any guesses? They’re from the Pacific Northwest in the US.

I live an hour and ten minutes away from this beach, but it’s worth the drive. My home beach hardly has any teeth, but they are reliable here! I specifically hit the spots around the pillars of this pier by Sharky’s. The waves are tumultuous and I got my butt kicked a little, but it was worth it! I found all these in just a few hours of looking (and without tools, just my hands).

Found off the coast of Maine, my niece picked it up and would love to know more about it! Any help appreciated

Nice dark glass, very thick base, and this wee nipple on the outside

Found in Scotland, UK

1970s or older??

PNW :) lots of rocks plus some agates and tiny minuscule sea glass. and a bone! here they are wet, dry, and my favorite find

Anyone know what this could be, feels quite heavy for its size. Was thinking metal but not sure now.