| |
| | Summary of Citation (Site not responding. Last check: 2007-11-07) |
 | | Type section designated as Pony Trail Canyon in Frenchie Creek and Pine Valley 15' quads, Eureka Co, NV. |
 | | Publication: Smith, J.F., Jr., 1974, Age of Pony Trail Group in Cortez Mountains, Eureka County, Nevada, IN Cohee, G.V., and Wright, W.B., Changes in stratigraphic nomenclature by the U.S. Geological Survey, 1972: U.S. Geological Survey Bulletin, 1394-A, p. |
 | | Frenchie Creek Rhyolite of Pony Trail Group is considered Late Jurassic on basis of 151 +/-3 Ma age on biotite (R.L. Armstrong, written commun., 1972). |
| ngmdb.usgs.gov /Geolex/Refsmry/sumry_11619.html (246 words) |
|