Nanjemoy MD Fossil ID #3

[MGooden]

Good evening, brand newbie here. We recently went shark tooth hunting on the beach at Purse State Park in Maryland and along with sand Tiger/goblin/mackerel shark teeth, Gastropod internal molds, stingray dental plates, I collected a few other items that seemed unique. I looked online at some fossil sites for the Paleocene era but man I have to admit I was ready to toss these. Figured it was worth an ask here. 
 

I used the centimeter side of my ruler to take photos of each of the items and will post each in a separate post. 
 

 

[Rockwood]

This looks like another trace fossil. It's too incomplete for me to try to identify further though. The matrix looks similar to the gastropod steinkerns that were common there when I visited the spot.

[MGooden]

6 hours ago, Rockwood said:

This looks like another trace fossil. It's too incomplete for me to try to identify further though. The matrix looks similar to the gastropod steinkerns that were common there when I visited the spot.

Thank you so much!