This is the second edition of Hitchcock important geological map of the United States. In addition to the geologic formations, the large and colorful map includes information identifying railroads, roads, canals, army arsenals and forts. A table at lower left provides an explanatory key to the colors used to indicate nine distinct geological formations. The carefully drawn map shows good geographical detail as well as remarkable geological information. J. Bien lithographer.

References: Marcou & Marcou #67.

Condition: B

Great color and strong, bold impression. All folds are reinforced with archival tape on verso to repair some small separations and minor paper loss.