@mackenzie-ross-2 Thanks!

Possibly Saturnus dubius (Packard, 1922)

Ceraurus sp. pygidium to the right of the gastropod.

Part of a partial and very heavily weathered ammonite, not a vertebrate. The shiny lustrous part is part of the nacre (like the inside of a pearl shell), which means it is a mollusk. The “teeth bumps” are likely sutures of an ammonite. If you look at a suture from the end, it has round evenly spaced bumps. You can see some examples here:…[Read more]

In a word, no. No one can determine the age of a rock simply by a picture.

To be more specific:
If you found it within the bedrock itself, if the rock formations in the area have been mapped, if the geologic maps have been incorporated into macrostrat, then you can look up the location of where you found it and see what formations have been…[Read more]

@mackenzie-ross-2 Thanks!

To stabilize fragile shell specimens, I like to consolidate them with repeated applications of 5% Paraloid/Acryloid B72 solution prior to extraction. I also try to extract them with a healthy amount of surrounding matrix to ensure stability and that any obscured pieces of the specimen remain. The matrix can then be removed later on at home or in…[Read more]

It may also be a worn ray dental plate. Please take a picture of the entire specimen with a scale reference, such as a ruler.