Description

Late Cambrian
Weeks Formation
Amasa Valley, UT, USA
Very fine 0.5 inch trilobite
Trilobite,

Menomonia is a genus of trilobite that lived only during the Late Cambrian.  It’s been found in rocks of that age in various parts of North America (eastern and western Canada, Texas, Wisconsin and Utah).

The availability of Weeks Formation trilobites on the market has been spotty across the years.  Here’s a high-quality Menomonia specimen.