A Miocene river in northern Arizona and its implications for the Colorado River and Grand Canyon
GSA Today
By: Ivo Lucchitta, Richard F. Holm, and Baerbel K. Lucchitta
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Abstract
The southwesterly course of the pre–late Miocene Crooked Ridge River can be traced continuously for 48 km and discontinuously for 91 km in northern Arizona. It is visible today in inverted relief. Pebbles in the river gravel came from at least as far northeast as the San Juan Mountains. The river valley was carved out of easily eroded Jurassic and Cretaceous rocks, whose debris overloaded the river with abundant detritus, possibly steepening the gradient. After the river became inactive, the regional drainage network was rearranged twice, and the Four Corners region was lowered by erosion 1–2 km. The river provides constraints on the history of the Colorado River and Grand Canyon; its continuation into lakes in Arizona or Utah is unlikely, as is integration of the Colorado River through Grand Canyon by lake spillover. The downstream course of the river was probably across the Kaibab Arch in a valley roughly coincident with the present eastern Grand Canyon.
Suggested Citation
Lucchitta, I., Holm, R.F., Lucchitta, B.K., 2011, A Miocene river in northern Arizona and its implications for the Colorado River and Grand Canyon: GSA Today, v. 21, no. 10, p. 4-10, https://doi.org/10.1130/G119A.1.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A Miocene river in northern Arizona and its implications for the Colorado River and Grand Canyon |
| Series title | GSA Today |
| DOI | 10.1130/G119A.1 |
| Volume | 21 |
| Issue | 10 |
| Year Published | 2011 |
| Language | English |
| Publisher | Geological Society of America |
| Publisher location | Boulder, CO |
| Contributing office(s) | Arizona Water Science Center, Astrogeology Science Center |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | GSA Today |
| First page | 4 |
| Last page | 10 |
| Country | United States |
| State | Arizona |