The Nopah Trilobite Quarry consists of two small sites with outcrops of fossil-bearing shale along the Old Spanish Trail Highway in California southwest of Pahrump, Nevada. Trilobites here occur in the Lower Cambrian Pyramid Shale Member of the Carrara Formation, in greenish shales and maroon siltstones dating from about 518 mya. Few specimens are intact, but it is easy to find legs and head shields from three members of the genus Olenellus. Link to more information.

Access to the site is via a paved highway, 0.3 miles west of Emigrant Pass. The quarry sites are in roadcuts, but a parking area allows fossil hunters to park safely off the road. The area has been quarried for years, so look for quarry pits and discard piles. From the parking area (Table 1, Site 1607), there is a productive roadcut uphill along the highway (Upper Site; Site 01), and another productive area downhill and just off the highway (Lower Site; Site 02).

Link to map.