Nanjemoy MD Fossil ID #2

[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.

Edited December 14, 2022 by MGooden

[Ludwigia]

Bivalve with bryozoa

[rocket]

nice find, could you do a close up of the bryozoa? Thanks

[MGooden]

7 hours ago, rocket said:

nice find, could you do a close up of the bryozoa? Thanks

Sure! Attached. How’s this?

[rocket]

3 minutes ago, MGooden said:

Sure! Attached. How’s this?

 

good, I downloaded it and hope to identify. Not easy with the bryozoans, normally you need the internal structures, openings, chambers... But, for a first idea it will perhaps be possible

[MGooden]

Can you tell me what time period this would have been from? I'm googling but confused as to when this fossil would have come from. 

[hemipristis]

8 hours ago, MGooden said:

Can you tell me what time period this would have been from? I'm googling but confused as to when this fossil would have come from. 

The Nanjemoy Fm is the fossiliferous strata at Purse (one of my favorite collecting locations in days of yore), and is late Paleocene/early Eocene. Your bivalve belongs to the oyster family, but I don’t know the genus or species.  I recall finding them there.

Edited December 15, 2022 by hemipristis

[MGooden]

On 12/15/2022 at 6:13 AM, hemipristis said:

The Nanjemoy Fm is the fossiliferous strata at Purse (one of my favorite collecting locations in days of yore), and is late Paleocene/early Eocene. Your bivalve belongs to the oyster family, but I don’t know the genus or species.  I recall finding them there.

thanks so much!

[MarcoSr]

On 12/15/2022 at 6:13 AM, hemipristis said:

The Nanjemoy Fm is the fossiliferous strata at Purse (one of my favorite collecting locations in days of yore), and is late Paleocene/early Eocene. Your bivalve belongs to the oyster family, but I don’t know the genus or species.  I recall finding them there.

 

Purse State Park has exposed zones 2 through 5 of the Paleocene Aquia Formation.  Zones 3 and 5 are hard indurated layers.  You have to go further downriver from Purse State Park to find exposed the early Eocene Nanjemoy Formation.

 

Marco Sr,