Map of United States in the Late Cretaceous Time

By Water Availability and Use Science Program 1969 (approx.)

Map of the U.S. cover by shallow sea except areas of the Rocky Mountains, Great Lakes, Appalachian, and North East.

Original Thumbnail Medium

Detailed Description

Map of United States in Late Cretaceous Time (66 to 100 million years ago). Source: USGS Bulletin 1291.

Sources/Usage

Public Domain.