Pogonip Group

The Pogonip Group is an Ordovician period geologic group located in southern Nevada and in Utah.

Geology

Its subunits in Nevada, from youngest/later to oldest/earlier, are:

Goodwin Limestone — thick
Ninemile Formation — thick
Antelope Valley Limestone — thick

It preserves fossils dating back to the Early Ordovician stage of the Ordovician period.