This colorful geological map focuses on the United States, but also includes a good portion of Canada and the Baja. It identifies twelve different geological structures by color. This updated German edition by Justus Perthes presents much of the same information as Marcou's original 1853 map but extends geological coverage to the Pacific and eliminates the geological profile across the top. The Copper trap previously shown in the Wind River Mountains is not depicted here. An uncommon edition of Marcou's scarce map.

References: cf Marcou #48.

Condition: B+

Fine impression and bright color with a 1-inch separation in the upper centerfold, just extending into the image. There is also a repaired small tear in the upper left blank margin not affecting the image.