Unit is named the Rand Schist. Age is Archean.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
Rand Schist of Hulin (1925) is adopted. Age is Precambrian(?).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
Age of the Rand Schist is Mesozoic(?).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).