Finis Shale ID

[mikecable]

Straight line cephalopod fragments. One stood out. Plant? Finis Shale.

[Tidgy's Dad]

I think it's a scaphopod. 

Nice. 

[jpc]

What age is Finis Shale?  

[Miocene_Mason]

1 minute ago, jpc said:

What age is Finis Shale?  

I remember hearing Carboniferous but I am not sure. Looks like orthodontic nautiloids to me.

[Tidgy's Dad]

Yes, Upper Carboniferous / Pennsylvanian. 

Found one on the web :

http://www.northtexasfossils.com/scaphopoda.htm

Scaphopod : Plagioglypta . 

[mikecable]

Thanks all.  The structure was just so much different than the others.

[mikecable]

Lost Creek Reservoir. Jacksboro, texas. Finis Shale. The fmis Shale is in the lower section of the Graham Formation, Cisco. Virgilian Series of the Upper Pennsylvanian. This, approximately 300 million year old, outcrop represents one of the most richly fossiliferous exposures of marine shelf sediments in the United States.

[erose]

There are several types of scaphopods there and several (2-3+?) straight cephalopods. Look for presence of a siphuncle and the position, centered, off-center, very close to the edge.