Unknown fossil

[PaleoOrdo]

I found this fossile last summer at the beach of Randsfjorden in Norway, Kalvsjøen formation, from late Katian, late Ordovician, but cannot figure out what it is. The speciemen is about 3 cm long and geodized in the middle.

Does anyone have an idea what it can be? Thanks for any suggestions.

Martin

[GeschWhat]

[Fossildude19]

Looks like a cross section through a bivalve, to me. 

[FossilDAWG]

I agree, a strongly ribbed bivalve or brachiopod.  The way the fossil stands out from the limestone suggests it may be silicified.  You may be able to expose more by etching in vinegar or very dilute acetic acid.  If you try that, just keep an eye out on how it progresses to make sure you don't dissolve the fossil.

 

Don

[PaleoOrdo]

5 hours ago, FossilDAWG said:

I agree, a strongly ribbed bivalve or brachiopod.  The way the fossil stands out from the limestone suggests it may be silicified.  You may be able to expose more by etching in vinegar or very dilute acetic acid.  If you try that, just keep an eye out on how it progresses to make sure you don't dissolve the fossil.

 

Don

Thank you Don and Tim. I agree with bivalve or brachiopod, indeed it is strongly ribbed,

Thank you for the advice, Don,  I will give the vinegar a try.

Edited July 20, 2023 by PaleoOrdo