"Geological Map of Isle Royale Lake Superior", Jackson, Charles T.
Subject: Lake Superior, Michigan
Period: 1847 (dated)
Color: Hand Color
21.3 x 14.8 inches
54.1 x 37.6 cm
This is an early edition of Jackson's important geological map that locates sandstone, conglomerate and trap formations and delineates copper veins as well as copper and silver mines. A scale below title converts chains to miles. Fancy title lettering.
References: cf. Marcou & Marcou #363
There is some light offsetting in the image, else very good. Issued folding.