Unknown Silica Shale (Middle Devonian) Bivalve

[connorp]

I collected this bivalve cast a couple years ago in the Silica Shale (Middle Devonian) of Michigan. I'm not super positive on an ID and was hoping someone here might have some thoughts. @Peat Burns @Misha @Tidgy's Dad? Thanks for any help.

 

 

[Fossildude19]

Looks like a Modiomorpha sp. to me.

 

[Tidgy's Dad]

Maybe Mytilarca cordata? 

Really not sure. 

Nice specimen . 

[Fossildude19]

@Peat Burns

[Peat Burns]

On 4/7/2022 at 12:50 AM, connorp said:

I collected this bivalve cast a couple years ago in the Silica Shale (Middle Devonian) of Michigan. I'm not super positive on an ID and was hoping someone here might have some thoughts. @Peat Burns @Misha @Tidgy's Dad? Thanks for any help.

 

 

 

On 4/7/2022 at 2:49 PM, Fossildude19 said:

@Peat Burns

I think Tim is right.  So far as I know, there is only one Modiomorpha recorded from the Silica Shale:  Modiomorpha subalata (I'm not sure if that name is still valid or not).  Here is a comparison of Connor's (top), one figured in the Silica Shale book from the Medusa North Quarry (middle), and one figured in the Bulletin of the Buffalo Society of Natural Sciences (New York) (bottom):

 

 

 

 

Edited April 11, 2022 by Peat Burns