Need help determining if this is a fossil.

[Chicory56]

I found these two in the creek in my backyard in central western New Jersey.  They appear to have symmetry and share common features.  Does anyone know what I might be looking at?

I’ve also found what appear to be osteoderms in great abundance in the same area.  Any help or guidance in the right direction would be appreciated.  Thank you. 

[Lone Hunter]

Do you have pictures of the osteoderms? 

[Paleorunner]

Wait for responses from other members, but I only see two rocks.
Welcome to the forum.

[Rockwood]

3 hours ago, Chicory56 said:

They appear to have symmetry and share common features.

Sorry. This degree of similarity is well within the statistical probability of a random event given the sheer number of rocks to be found.

I agree that these look like common rocks.

[Chicory56]

Thank you everyone, for the quick responses and warm welcome!  Here are some photos of what I thought to be osteoderms.  They stick to my hands when my palms are sweaty.   I kept noticing that the pointy looking ones all have this tip, where the surface texture seems to be different from the rest of the rock.  The last one doesn’t seem to be an osteoderm but it looks rather interesting.  

[Plax]

Since you're in the Triassic / Jurassic outcrop belt you also have the chance for igneous rocks. These do look sedimentary though and some of the shapes are probably trace fossils. Red beds in the area may have footprints and the very dark beds may have fish and other remains. This rock is very difficult to prospect with out a good guide. The professional literature is probably the only source for information. Here's one I googled up that may be of help. Olsen is a prolific author on the subject.

https://www.ldeo.columbia.edu/~polsen/nbcp/olsen_formations_80_sm.pdf

[Fossildude19]

Not seeing any osteoderms here, unfortunately.