GEOLEX database Geologic Unit: Hanson Creek Usage: Hanson Creek Formation (ID*,NV*) Age: Ordovician, Middle* Ordovician, Late* Silurian, Early* Geologic Province: Great Basin province* Idaho Mountains province* Areal Extent: ID* NV* Type Locality: "Typical" exposures occur on west side of Roberts Creek Mountain, Eureka Co, NV. Derivation of name not stated by author, but probably named from Pete Hanson Creek (Merriam, 1940). Subunits: Combs Canyon Dolomite Member (NV*). Unit Name History: Named (Merriam, 1940). Overview (Dover, 1983). Note: If you need more information, please contact Nancy Stamm (nstamm@usgs.gov). Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys. "No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses (). Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]). U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html Database project personnel Last modified: 15-Jan-2013