This AgnostidTtrilobite from the Wheeler Formation of Utah is a beautiful specimen of the species Ptychagnostus atavus. 

This is a piece with servile Nevada Trilobites of the relative rare species Syspacephalus various from the Emigrant Fm.. Some of the specimens are preserved as negative.

This is a rare Nevada Trilobite of the species Teresellus goldfieldensis from the lower Cambrian Poleta Formation of the Montezuma Range. This fossil is a inexpansive study piece for this rare Trilobite species.