Ptychopariida;
Cedariidae, Cedaria minor and Ptychopariida: Marjumiidae; Modocia
weeksensis (Trilobites)
Geologic
Time: Upper Middle Cambrian
Size (25.4mm=1
inch): Modocia: 21 mm long by 15 mm across, Cedaria: 11 mm and 9 mm long
by 10 mm and 7 mm wide on a 130 mm by 115 mm matrix
Fossil Site:
Weeks Formation, Millard County, Utah
|  Description:
This plaque displays 2 examples of trilobites of the Order Ptychopariida.
The larger example is Modocia weeksensis (once called M. hewlisca).
They are typically found missing the genals, and as such are mostly
molts. There are also many partials of the same taxon present. The
complete trilobites are members of the family Cedariidae known as
Cedaria minor. They are a fine, well-inflated examples with tightly-attached
genals that would make a fine addition to any trilobite collection.
Overall, we have a fine assemblage of 2 trilobites from the same
order of disparate morphology.
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