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