This is a piece of soft-shelled turtle bone, family Trionychidae

These are from a group of sharks called the gray sharks or requiem sharks, genus Carcharhinus

Hi @jacob-hunter! I wondering if this may be a large piece of schist with staurolite crystals on it. Could you take some more photos with a scale bar?

Hi Trinity! I think this is a worn down oyster shell.

Hello, this is a tiger shark tooth, Galeocerdo cuvier!

Hey @charlie-smith, this was previously called Isurus praecursor, but has since been re-assigned to Macrorhizodous praecursor.

Hi @samantha-ocon, horn corals fall under the subclass Rugosa (according to PBDB), so the taxonomy cannot be updated unless you can narrow it down to an order.

Sure thing, it definitely can be challenging to distinguish them! Physogaleus has a more robust root, has a twist towards the top of the crown, and often has finer serrations. I like to use this website to help ID shark teeth http://elasmo.com/

Hi @jacob-polzin, I meant to mention in my first comment that this tooth looks like Galeocerdo aduncus to me rather than Physogaleus. Could you update that as well?

Hi @thijs-verbeke do you have any more specific locality or geologic data for this specimen?

The ID is the same, the name has just been updated.

Hey @thijs-verbeke can you narrow down the location to a nearby city? Also, I think the Yixian Formation is part of the Jehol Group.

Hey @jacob-beasecker could you add a couple more photos of this specimen from different angles?

Hi @thijs-verbeke, do you happen to know the nearest town to where this was found? Also, I think the taxonomy has been updated on this species to Edmontia longiceps. https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=63920

Hi @thijs-verbeke, I’m not seeing any identifiable features on this one to assign it Desmostylus. @gsantos any thoughts on this one?

Hi @danita-brandt, sorry for all the messages today. We’re wrapping up the curation from the FOSSILblitz. The photo on this one is a little too blurry for us to verify the ID.

Hey @jacob-beasecker, this one also looks like Heliophyllum based on the second 3D model on this page: https://www.digitalatlasofancientlife.org/learn/cnidaria/anthozoa/rugosa/

@mackenzie-smith were you able to narrow down the ID on this one?

Hey @danita-brandt, do you now the nearest town to where this was found so that we can mark this as research grade?