Help Identifying Imprints

[Littlefoot]

These two imprints were found at Stratford Hall, Virginia, last July. I had a pickle of a time photographing them so the impression would show up, especially as on one of them, the imprint is pretty faint. 

 

I was wondering if anyone could verify if these are fossils, and if so, can anyone identify just what exactly these are imprints of? Thank you for any thoughts you might have!

 

Imprint #1 Front

 

Back

 

 

Imprint #2 Front

 

Black and White version.

 

Back

[Fossildude19]

These look crabby - decapod-ish - arthropod-ish, to me.  

Maybe @Al Dente or @Plax might have some ideas. 

[Auspex]

+1 for crab impressions.

[ynot]

From the looks of those, You have pieces of concretions that contained crabs. Nice find.

Now You need to look for a whole concretion with a crab in it.

[Plax]

am with the others re crab concretion. In future visits I'd look for similarly shaped/colored concretions and crack them to see if they contain more complete crabs. Sometimes a bit of crab will be peaking out around an edge so you can prep at home instead of with the hammer.

[Littlefoot]

Thank you so much @Fossildude19, @Auspex, @ynot, and @Plax !

 

Plax -- that's great advice to look for similar concretions! I'll do that the next time I visit Stratford!

[MeargleSchmeargl]

Looks like you're getting really crabby today.