Investigation of upper Carboniferous strata in the vicinity of Newcastle West, in western Ireland, has shown the presence of about 500 feet of lower Coal Measures, including the Gastrioceras subcrenatum and G. listeri marine bands. A coarse feldspathic sandstone occurs in the section and is correlated with the Clay-Gall sandstone of the Leinster coal field, 100 miles to the east. The paleogeography is explained as a land mass with a southwest shore line supplying sediment to a delta with a seaward margin advancing to the north.

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