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Rapid late pleistocene incision of Atlantic passive-margin river gorges

Science

By:
, , , , ,
DOI: 10.1126/science.1097780

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Abstract

The direct and secondary effects of rapidly changing climate caused large rivers draining the Atlantic passive margin to incise quickly into bedrock beginning about 35,000 years ago. Measured in samples from bedrock fluvial terraces, 10-beryllium shows that both the Susquehanna and Potomac Rivers incised 10- to 20-meter-deep gorges along steep, convex lower reaches during the last glacial cycle. This short-lived pulse of unusually rapid downcutting ended by 13,000 to 14,000 years ago. The timing and rate of downcutting are similar on the glaciated Susquehanna and unglaciated Potomac Rivers, indicating that regional changes, not simply glacial melt-water, initiated incision.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Rapid late pleistocene incision of Atlantic passive-margin river gorges
Series title:
Science
DOI:
10.1126/science.1097780
Volume
305
Issue:
5683
Year Published:
2004
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
499
Last page:
502
Number of Pages:
4