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Llewellyn Formation
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・ Llewellyn Jones (bishop)
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Llewellyn Formation : ウィキペディア英語版
Llewellyn Formation

The Llewellyn Formation is a mapped bedrock unit in eastern Pennsylvania. It was previously known as the "coal measures" and the post-Pottsville rocks. The formation is named for the community of Llewellyn in Schuylkill County.〔Wood, G.H., Trexler, J.P., Kehn, T.M., (1964). Geology of the West-Central Part of the Southern Anthracite Field and Adjoining Areas, Pennsylvania. United States Geological Survey, C-46.〕
==Description==
The Llewellyn is defined as a gray, fine- to coarse-grained sandstone, siltstone, shale, conglomerate, and anthracite coal in repetitive sequences. Although gray (light to dark) is the dominant color, other colors described include: buff, dark to light brown, and black.〔Berg, T.M., Edmunds, W.E., Geyer, A.R. and others, compilers, (1980). Geologic Map of Pennsylvania: Pennsylvania Geologic Survey, Map 1, scale 1:250,000.〕

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