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Hammer Creek Formation
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Hammer Creek Formation : ウィキペディア英語版
Hammer Creek Formation

The Hammer Creek Formation is a mapped bedrock unit consisting primarily of conglomerate, coarse sandstone, and shale.
The Hammer Creek Formation was originally mapped as part of the Gettysburg Formation in Adams County, Pennsylvania in 1929.〔Stose, G.W., and Bascom, Florence, 1929, Description of the Fairfield and Gettysburg quadrangles (Pennsylvania): U.S. Geological Survey Geologic Atlas of the United States, Fairfield-Gettysburg folio, no. 225, 22 p.〕 J. D. Glaeser renamed part of the Gettysburg to the Hammer Creek in 1963,〔 to "avoid extending either the Gettysburg Formation from the west or the Brunswick Formation from the east to include rocks typical of neither unit."
A major groundwater resources study of the Hammer Creek Formation and other formations of the Newark Supergroup in Pennsylvania was published by Charles R. Wood in 1980.〔Wood, C. R., 1980, Groundwater resources of the Gettysburg and Hammer Creek Formations, southeastern Pennsylvania: Pennsylvania Geological Survey, 4th ser., Water Resource Report 49, 87 p. ((web release )).〕
==Depositional Environment==
The Hammer Creek Formation and other formations of the Newark Supergroup were deposited in the Newark Basin, just one of many Triassic rift basins existing on the east coast of North and South America, which formed as plate tectonics pulled apart Pangaea into the continents we see today.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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