Here is a nice specimken of a quite rare Brachyaspidion microps from the Pierson Cove Formation.
Pierson Cove Formation is mostly equal to Wheeler and mostly Marjum Formations and represent a shallower environment.
|Drum mountains, Millard Co., Utah, USA|
|Size trilobite:||about 11 mm long|
|Age:||Middle Cambriun, Pierson Cove Fm. (about 518 Mill. Y.)|