Upper Ordivician Sequatchie Fo

A detailed Summary of Upper Ordivician Sequatchie Fo

Rocks belonging to the Ordovician System are exposed along Interstate 75 between Cleveland and Chattanooga in a road cut in White Oak Mtn or sometimes called Green Gap. These rocks show the upper portion of the Middle Ordovician Catheys Formation and all of the Upper Ordovician Sequatchie Formation including the Fernvale Member.

The road cut exposes a section of rock that was measured at two hundred and seventy-five feet. This stratigraphic section was examined in detail to determine the paleodepositional environment in which these sections of rock were deposited. There are a total of five units that have been identified and the lithography studied in detail. These five units will be split up and described separately to clarify the content of each unit more easily.

Unit one represents the Catheys Formation. This unit grade

s upward and has a scoured bottom. This unit consists of mostly calcirudite and shale layers with occasional siltstone overlying the calcirudite. There are nine cycles present in this unit. There are skeletal debris as well as burrows present in these layers. These rocks are carbonate-rich as well. The siltstone suggests a low energy environment of deposition, but the burrows tell of slightly more energetic conditions.

Unit five is representative of the Fernvale Member of the Sequatchie Formation. Tan and pink calcirudite and cacarenite plus silty gray shale make up the major portion of unit five. This unit is approximately twenty feet thick and consists of eight layers of tan calcirudite. These rocks are shoal deposits or were deposited on a shell bank. Low energy environment is typical of the deposition shown in this unit.

This unit

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Approximate Word count = 573
Approximate Pages = 2 (250 words per page double spaced)

Category: Science

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