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The Accotink Schist, Lake Barcroft Metasandstone, and Popes Head Formation; keys to an understanding of the tectonic evolution of the northern Virginia Piedmont

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The Accotink Schist, Lake Barcroft Metasandstone, and Popes Head Formation; keys to an understanding of the tectonic evolution of the northern Virginia Piedmont; 1981; PP; 1205; Drake, Avery Ala; Lyttle, Peter T.

Summary

The newly named Accotink Schist and Lake Barcroft Metasandstone of the Eastern Fairfax sequence are the structurally lowest metamorphic rocks in the northernmost Piedmont of Virginia. The Accotink consists of beds of pelitic schist that have thin basal intervals containing graded, very fine grained metasiltstone, as well as interbeds of metasandstone like that in the overlying Lake Barcroft Metasandstone. The unit is characterized by the Bouma turbidite sequences Te and Tde and can be assigned to turbidite facies D and E. The thickness of the Accotink is not known because its base is not exposed. The Accotink Schist grades up into the Lake Barcroft Metasandstone, which consists of two types of metasandstone. Type I metaarenite is quartzofeldspathic [...]

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Type Scheme Key
local-index unknown pp1205
local-pk unknown 5847
series unknown Professional Paper

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journalProfessional Paper
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languageENGLISH
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