Map of United States in Middle Pennsylvanian Time (about 300 million y

Map of United States in Middle Pennsylvanian Time (about 300 million years ago).

Detailed Description

Map of United States in Middle Pennsylvanian Time (about 300 million years ago). (Source: USGS Bulletin 1291)

Details

Image Dimensions: 1024 x 660

Date Taken:

Location Taken: US