Ammonites from the
Prionocyclus wyomingensis
Biozone




Prionocyclus wyomingensis  Meek 1876

  pwyo pwyo
gracile form of Prionocyclus wyomingensis from the upper part of the Juana Lopez Member of the Mancos Shale
at localities east of Ferron to Southeast of Green River, Utah.  The one on the left is 58mm and the one on the right is 71mm

Pwyo?

gracile form 76mm dia, close to P. novimexicanus, from east of Clawson


wyomingensis r

robust form of Prionocyclus wyomingensis, 37mm



Pwyo lat Pwyo ventral  
 
robust form of Prionocyclus wyomingensis 32mm.  lateral and ventral view.

large P. macombi

a large adult specimen from concretions in the Frontier Formation east of Vernal.
320 mm dia., the gracile form.




Scaphites ferronensis Cobban 1951


Scaphites ferronensis S ferronensis

from the upper part of the Juana Lopez Member of the Mancos Shale
at localities east of Ferron to Southeast of Green River
,
The one on the left is 46mm long, the one on the right is 37mm long

pissinus
Pteroscaphites pisinus Cobban 1952, next to a larger Scaphite (S. cf. S. whitfieldi)


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