Mystery Fossil from Coleraine Formation, MN

[TheGoblinKing]

Hey there everyone!

   I haven't been on in some time but I've just started unpacking my stuff from a move and I came across this fossil that I found in the fall of last year. I found it in an eroding gravel cliff that I frequently find Coleraine formation deposits in. 

 

   This fossil is one of the handful that I haven't been able to identify. Whatever it is, it's one of the larger fossil/casts that I've found. Any help would be appreciated! 

 

[Rockwood]

Sorry. I don't see a fossil here. 

[TheGoblinKing]

@Rockwood

Here are some daylight photos. Ive included a gastropod and some sort of horn coral that I found in the same area as the subject. 

 

The mineral replacement as well as the matrix sediment varies widely at this site. My guess is that this is caused my the glacial deposition of the formation from different layers/depths.

 

I'm quite a long ways from being called an expert, but I've handled quite a bit of coleraine and spent many hours collecting it. If this isn't a fossil then it's an example of some very odd erosion on a chunk of coleraine formation matrix material/seafloor.

 

An extra look would be appreciated

[Rockwood]

I still don't recognize anything in the top photos here. It's not uncommon to find a mixture of degrees of preservation in close proximity. Sometimes non fossil clasts can be in the mix as well. 

[TheGoblinKing]

Alrighty, it was worth a shot! Thanks for taking some time to check it out

[Coco]

Hi,

 

On the last object I think I see a coral, and on the one before a part of the gastropod internal mussel.

In the future, number your photos or articles ! It’s easier to answer and help you

 

Coco

[Ludwigia]

Concretionary ironstone in my opinion.

[rocket]

Concretion is a really lovely whim of nature! No fossil, but in my opinion worth to collect 

Edited August 24, 2022 by rocket

[Fossildude19]

First item, concretion.

Second item, gastropod steinkern.

Third item, rugose coral.