1891 North American Continent beginning of Lower Silurian (Ordovician) Time - J W Powell

12637

J W POWELL

Hypothetical Map of the North American Continent at the beginning of Lower Silurian (Ordovician) Time

Continent: North America

1890
Lithograph, Colored
Sheet Size 11.25 x 14.1 inches
Publisher: US Geological Survey, Washington DC
VG condition with center fold as issued, toning to margin and center fold

Cartographer/Map Maker: J W Powell