The Lower Silurian Brassfield Formation: A Condensed Sequence Of Punctuated Deposition?

Norrish, Winston Alfred.

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The Lower Silurian Brassfield Formation: A Condensed Sequence Of Punctuated Deposition? Open Access Deposited

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Date Uploaded: 03/26/2018
Date Modified: 03/26/2018

The Brassfield Formation is a very thin, highly condensed carbonate unit that encompasses most of the Llandovery (8.5 MMYR) and covers much of the eastern midcontinent. Fifty-six Brassfield outcrops exposed around the flanks of the Cincinnati arch comprise three members, four facies tracts, and seven lithofacies. The three types of condensation recognized in the Brassfield (dynamic bypass, punctuated deposition, and sediment starvation) are related to sea level fluctuations, manifested as a hierarchy of sequence orders, that ultimately controlled the spatial and temporal distribution of facies.

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