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Coconino Sandstone - School Essays

Coconino Sandstone

Abstract
The sediments and the trace fossils of the record the advance passage of a major eolian sand sea. Both invertebrate and vertebrate traces indicate that the substrate was, was for the most part, very dry though it was clear that light rainfall or dew periodically moistened the dune surfaces. Although we know that the erg was characterized by both simple and complex bedforms that apparently were oriented approximately transverse to the main direction of sand transport, we have much to learn about the distributions of the bedforms and the dynamics of the Coconino erg.
Introduction

The Early Permian Coconino Sandstone is one of the most noticeable formations in the Grand Canyon. ...

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we can describe trace fossils in the Coconino and relate them to the physical environments of deposition. This provides us with more comprehensive reconstruction of the erg environments.
Although the cliff-forming nature of the formation can present certain logical problems, the exceptional three-dimensional exposures in the Grand Canyon give the sedimentologist and ichnologist the opportunity to examine the details of one of the more classic and interesting eolian deposits on the Colorado Plateau.

Lithology

This layer averages about 260 million years old and is composed of pure quartz sand, which are basically petrified sand dunes. Wedge-shaped cross bedding can be seen where traverse-type dunes have been petrified. The color of the layer averages from white to cream colored. No skeletal fossils have yet been found but numerous invertebrate tracks and fossilized burrows do exist.
Brand’s work has indicated that the track-ways of the vertebrates in the sandstone ...

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Coconino Sandstone. (2007, October 3). Retrieved December 23, 2024, from http://www.essayworld.com/essays/Coconino-Sandstone/72114

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PAPER DETAILS

Added: 10/3/2007 01:00:10 AM
Category: Science & Nature
Type: Premium Paper
Words: 1125
Pages: 5

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