Shell mass?

[Blackfoot58]

This was found in the Okojobi, Iowa area many years ago and was gifted to me. I’m not sure “Fossils” is the correct forum, but definitely not a rock. Pretty fragile piece. Amazing how it has held together. So many tiny shells and shell fragments in one compressed mass.
I thought it worth sharing.

 

Amazon Forum Fav 👍

Diving for Pleasure and Treasure - Grab it through Amazon!

[Red-Coat]

Neat. Fossil marine detritus. I can see bryozoans (the mesh-like structures) and a large pelecypod.

 

[ToddsPoint]

From the map, it looks like Lake Okojobi is in the glaciated part of your state. If it is, those shells could have come from anywhere north.

 

[ToddsPoint]

To the west, it’s underlaid by Cretaceous deposits. Leftovers from ancient shallow seas.