"Geological Map of Isle Royale Lake Superior", Jackson, Charles T.
Period: 1847 (dated)
Publication: Report on the geology and topograhy of…Lake Superior land district
Color: Hand Color
21 x 14.7 inches
53.3 x 37.3 cm
This is an early edition of Jackson's important geological map that locates Sandstone, Conglomerate and Trap formations and also delineates a copper vein as well as copper and silver mines. This edition varies from other examples we've seen with a simple legend that has smaller colored blocks and does not expand on the Trap formation as "Basalt and Porphyry." Within the map only two colors are used compared to the later version with three. Also, this example does not note Abandoned Mines, Mineral Land Supposed to Contain Copper or any furnaces. Further, it does not have the attribution to Exec. Doc. No. 5, 31st Congress, 1st Session and the survey credits to J.W. Foster, J.D. Whitney, S.W. Hill and W.S. Chlatter are likewise missing. An early edition of Jackson's 1847 issue.
References: Karpinski (MI) #764; Marcou & Marcou #363
Very nice example, folding as issued.