Crushed
Shell fragments
of
Prionocyclus novimexicanus?
Crushed
whorl with penny for scale. Notice base of spine in upper left hand
corner and small umbillical nodes or bullae below. Most shell fragments
from this locality are probably from the living chamber, but some have been
found with some of the inner whorls preserved (crushed of course). A
complete shell has not been found, most ammonites found in situ at
this locality are only about 30% complete. I have not found a specimen
at this locality with the venter preserved so I cannot identify them with
absolute certainty. Found a few meters above the Juana Lopez Member
in the main body of the Mancos Shale near the railroad siding of Grassy,
Emery County, Utah
Spine
base with possible plug of nacreous shell.
End view of shell at right shows both sides of shell with two spine
bases pushed against each other.
(click either image for more detail)
The spines shown below are hollow and also crushed. Internal
molds of these fossils would have nodes where the spine bases are.
A smaller
spine with a complete tip
A large spine
(click image for more detail)
End view
of a spine
