Science News
from research organizations

Unaweep canyon and Earth's deep-time past

Date:
March 19, 2015
Source:
Geological Society of America
Summary:
Unaweep Canyon is a puzzling landscape -- the only canyon on Earth with two mouths. First formally documented by western explorers mapping the Colorado Territory in the 1800s, Unaweep Canyon has inspired numerous hypotheses for its origin. A new article brings together old and new geologic data of this region to further the hypothesis that Unaweep Canyon was formed in multiple stages.
Share:
FULL STORY

This is a digital elevation model of the Uncompahgre Plateau and greater study region with key features labeled.
Credit: Figure 1 from Soreghan et al.; Soreghan et al. and Geosphere

Unaweep Canyon is a puzzling landscape -- the only canyon on Earth with two mouths. First formally documented by western explorers mapping the Colorado Territory in the 1800s, Unaweep Canyon has inspired numerous hypotheses for its origin. This new paper for Geosphere by Gerilyn S. Soreghan and colleagues brings together old and new geologic data of this region to further the hypothesis that Unaweep Canyon was formed in multiple stages.

The inner gorge originated ~300 million years ago, was buried, was then revealed about five million years ago when the ancestral Gunnison River began incising the Uncompaghre Plateau as part of the incision of the larger Colorado Plateau, and then the Gunnison River then abandoned the canyon upon landslide damming, ultimately joining the Colorado River.

This work highlights that incision of the Colorado Plateau by the Colorado River and its tributaries (including the Gunnison River) began synchronously across the entire Plateau, linking the incision of the Grand Canyon on the southern Plateau to events on the northern Plateau. It also highlights the intriguing possibility of preservation of very ancient landscapes from Earth's deep-time past, and the role of exhumation of those landscapes in shaping the modern face of the planet.


Story Source:

Materials provided by Geological Society of America. Note: Content may be edited for style and length.


Journal Reference:

  1. G. S. Soreghan, D. E. Sweet, S. N. Thomson, S. A. Kaplan, K. R. Marra, G. Balco, T. M. Eccles. Geology of Unaweep Canyon and its role in the drainage evolution of the northern Colorado Plateau. Geosphere, 2015; DOI: 10.1130/GES01112.1

Cite This Page:

Geological Society of America. "Unaweep canyon and Earth's deep-time past." ScienceDaily. ScienceDaily, 19 March 2015. <www.sciencedaily.com/releases/2015/03/150319075818.htm>.
Geological Society of America. (2015, March 19). Unaweep canyon and Earth's deep-time past. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2015/03/150319075818.htm
Geological Society of America. "Unaweep canyon and Earth's deep-time past." ScienceDaily. www.sciencedaily.com/releases/2015/03/150319075818.htm (accessed May 26, 2017).

RELATED STORIES