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Old Port Formation : ウィキペディア英語版 | Old Port Formation
The Devonian Old Port Formation is a mapped bedrock unit in Pennsylvania, Maryland, and West Virginia, USA. Members of the unit are also mapped in New Jersey and Virginia as parts of other formations or groups. ==Description== The Old Port Formation consists of several members with varying lithologies, which are (in ascending stratigraphic order): New Creek Member (limestone), Corriganville Member (limestone), Mandata Member (shale), Shriver Member (cherty limestone), and Ridgeley Member (sandstone). Where the Shriver Chert does not occur it may be replaced by the Licking Creek Limestone.〔''Geologic Map of Pennsylvania'', Berg, T. M., Edmunds, W. E., Geyer, A. R., and others, compilers, 1980, Pennsylvania Geological Survey, 4th ser., Map 1, scale 1:250,000 ()〕 It was originally combined from the Helderberg Group and Oriskany Group by Conlin and Hoskins in 1962 to form a single Formation with the above members.〔
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