Moon Engineer Special Study Generalized Photogeologic Map
By Astrogeology Science Center
April 1961 (approx.)
Detailed Description
Eugene Shoemaker's prototype Copernicus geology map. Was never formally published and printed sparingly in April 1961. Identifies five stratigraphic "systems". Pre-Imbrian, Imbrian, Procellarian, Erastothenian, and Copernican systems. It would later be discovered that this was to simplistic.
Sources/Usage
Public Domain.