Identifying Strata using Fossils


Specimen 1
This is a crinoid from the Fort Payne Formation.
Crinoids are found in all three strata, but Stones River, Nashville and Maysville Group crinoids are small and not found in massive blocks

Specimen 2 
This is a trace fossil from the Stones River Group.  Trace fossils are also found in all strata, but are more common and more spectacular in the Stones River Group.

Specimen 3
These are bryozoans from the Maysville Group.  the small branched ones are Hallopora.  I am not sure of the identity of the flat bryozoan/

Specimen 4
This is a slab of the brachiopod Resserella, from the Nashville Group.  Resserella is the commonest fossill in the Hermitage Formation of the Nashville Group and is not found elsewhere in the strata we are examining.

Specimen 5
This is a brachiopod from the Fort Payne Formation.  

Specimen 6 
This is a slab from the Stones River Group.  The clearest evidence is the presence of the delicate snail Hormotoma gracilis.  Hormotoma is also found in the Nashville Group, but that Hormotoma is larger and thicker.

Specimen 7
These are the typical bryozoans of the Stones River Group, possibly Rhynidictya or Escharopora, and the thin, frond-like Pachydictya.  Bryozoans of the Stones River Group are generally thinner and more delicate than those of the Nashville and Maysville Groups 

Specimen 8
Dendritic (tree-like) graptolite of the Fort Payne Formation

Specimen 9 
Brachiopods of the Nashville Group (Catheys Formation).  The brachiopod in the center of the slab is Hebertella