File:US pennsylvanian general USGS.jpg
Generalized geographic map of the United States location in Middle Pennsylvanian time.
During the Carboniferous period, the contrast in the distribution of land and water from the ancient past to the present becomes more dramatic. The map shows the outline of the United States as it looked during the Pennsylvanian Period some 300 million years ago. It gives the appearance of reversing present-day geography.
A highland which lay to the east, south, and north supplied much of the sedimentary debris that was spread over the midwestern part of the United States. The Midwest was mainly a low swampy area in which scouring rushes and fern trees grew in profusion. Sediment was carried into the region from deltas to the east. From time to time, the level of the sea fluctuated -- possibly because of glacial conditions in the Southern Hemisphere. Swamps were flooded, and forests were destroyed. Slowly, layers rich in tree stumps, spores, branches, and leaves were deposited. Later, heat and pressure changed these layers into the coal beds that are so extensive in Illinois, Kentucky, Pennsylvania, West Virginia, and Tennessee. To the west, marine limestones, sandstones, and shales accumulated in shallow seas whose vast expanses were dotted with shoals and islands. Some of the very large islands were formed by the buckling and uplifting of parts of the Earth's crust.
Lua error in package.lua at line 80: module 'strict' not found.
Lua error in package.lua at line 80: module 'strict' not found. http://pubs.usgs.gov/gip/continents/pennmap.jpg Lua error in package.lua at line 80: module 'strict' not found.
Captioned As
Page | Caption |
---|---|
Carboniferous | Generalized geographic map of the United States in Middle Pennsylvanian time. |
Pennsylvanian (geology) | Generalized geographic map of the United States in middle Pennsylvanian time. |
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 03:59, 19 August 2019 | 500 × 353 (22 KB) | Thales (talk | contribs) | ||
19:26, 17 March 2018 | No thumbnail | 500 × 353 (22 KB) | Thales (talk | contribs) |
- You cannot overwrite this file.
File usage
The following 5 pages link to this file: