Ammonites from the
Prionocyclus novimexicanus
Biozone




Prionocyclus novimexicanus  (Marcou) 1858

  pnovimexicanus pnovimexicanus
gracile form of Prionocyclus novimexicanus  the one on the left is 58mm and the one on the right is 50mm


novimex

gracile form of Prionocyclus novimexicanus, 58mm



novimex r novimex r  
 
robust form of Prionocyclus novimexicanus
The one on the left with some nacreous shell is 47mm dia.
The specimen on the right is 73mm dia., it shows the sutures well.

novimex r

the robust form, 117mm dia.
all from the Mancos Shale southeast of Green River



Scaphites whitfieldi Cobban 1951

s whit
46mm long


S whitfieldi  
38mm long

from concretions in the lower part of the main body of the Mancos Shale southeast of Green River.



Baculites yokoyamai Tokunaga and Shimizu 1926


B yoko

86mm long, 13mm at the aperture, from the Mancos Shale southeast of Green River.


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