Mystery Fossil from the Lost River - no idea!

[cameronsfossilcollection]

Here with another fossil, and I’m pretty sure this time it’s actually a fossil  Distinct striations on a smooth impression in the shale. Just half an inch longways and about .4 inches tall. 
Found at the regular Lost River cut, Middle Devonian age. Thanks guys! 

[Nautiloid]

Might be an impression of a bivalve or brachiopod.