Grand Mesa Emerald Isle

An Island erupts in the middle of a turquoise lake on top of the Grand Mesa on Colorado's Western Slope. Not too unusual considering the history... more

by Janice Pariza

Title

Grand Mesa Emerald Isle

Artist

Janice Pariza

Medium

Photograph - Photography Art

Description

An Island erupts in the middle of a turquoise lake on top of the Grand Mesa on Colorado's Western Slope. Not too unusual considering the history behind the Mesa and the way it was shaped and the geology..
The Grand Mesa is a large mesa in western Colorado in the United States. It is the largest flat-topped mountain in the entire world. It has an area of about 500 square miles (1,300 km2) and stretches for about 40 miles (64 km) east of Grand Junction between the Colorado River and the Gunnison River, its tributary to the south. The north side of the mesa is drained largely by Plateau Creek, a smaller tributary of the Colorado. The west side is drained largely by Kannah Creek, which is received to the west by the lower Gunnison River. The mesa rises about 6,000 feet (1,800 m) above the surrounding river valleys, including the Grand Valley to the west, reaching an elevation of about 11,000 feet (3,400 m), with a maximum elevation of 11,333 feet (3,454 m) at Crater Peak. Much of the mesa is within Grand Mesa National Forest. Over 300 lakes, including many reservoirs created and used for drinking and irrigation water, are scattered along the top of the formation. The Grand Mesa is flat in some areas, but quite rugged in others.
The mesa is topped by a hard volcanic basalt. This layer, formed approximately 10 million years ago by basalt flows, suppressed erosion compared to the surrounding sedimentary rock layers, which suffered rapid downcutting from the action of the Colorado and the Gunnison rivers. The top layer rests on a thick sequence of Eocene shale and sandstone known as the Green River and Wasatch Formations. These layers in turn rest on a Cretaceous layer known as the Mesaverde Group that forms a cliff about halfway up the side of the mesa. The lowest layers are yellow and gray Mancos Shale of late Cretaceous age. The shale continues outward into the surrounding valleys in the vicinity of the mesa, providing a soil base that is fertile for various kinds of agriculture, especially in the Gunnison Valley to the south.

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Uploaded

October 5th, 2016