Subject: Lake Superior, Michigan
Period: 1849 (circa)
Publication: 
Color: Hand Color
Size:
24 x 19.5 inches
61 x 49.5 cm
This detailed geological map covers the region from the Keweenaw Bay to the Chocolate River.  A color-coded key locates seven geological units, including sandstone, quartz, limestone, schistose and trappean rocks, granite and basalt.  There is also good detail of relief shown in hachure.  A scale below title converts chains to miles.  Fancy title lettering.
References: Karpinski (MI) #787; Marcou & Marcou #369
Condition: B
There is some light offsetting in the image and it is trimmed close to the neatline at top and bottom.  Issued folding.