Ammonites from the
Prionocyclus hyatti
Biozone


Prionocyclus hyatti  (Stanton) 1893
  gracile hyatti  


hyattir

Robust form of P. hyatti, 42mm dia.


Placenticeras pseudoplacenta (Hyatt) 1903

C. inflatum
From the Lower Ferron Sandstone Member



Scaphites carlislensis Morrow 1935

Scaphites carlislensis
The only specimen of Scaphites I have found from this biozone in Utah,
45mm long, from the Lower Ferron Member near Mounds.

<back to Collignoniceras | Home |  Chart| on to Macombi Zone>