On the Occurrence of Spirorbis -limestone and thin Coals in the so-called Permian Rocks of Wyre Forest; with Considerations as to the Systematic Position of the ‘Permians’ of Salopian Type

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Abstract
I. I ntroduction . T he occurrence of a band of Spirorbis -limestone associated with a thin coal-seam in red rocks which have hitherto been regarded as Permian in the district of Wyre Forest and Enville cannot but affect our ideas as to the systematic relationships of these beds, and may also have some influence on the mining prospects of that virgin strip of red ground which, narrowing from 14 miles broad at Madeley and Wolverhampbon to 6 between Compton and Stoutbridge, separabes the coalfields of Coalbrookdale and Wyre Forest on the west from that of South Statfordshire on the east. This red ground Consists of the ‘ Permian ’ rocks and all the members of the Trias. Crossing from west to east we pass successively from Coal Measures at Madeley on to ‘ Permian ’ [e 1 of the Geological Survey map],Lower, Middle, and Upper Bunter, Keuper Sandstone, and Marl, till we reach Codsall, when we again pass over the same series in inverse order—omitffng the Lower Bunter—fill we reach the Coal District of Wolverhampton. At the base of the Trias in this district there seems to be a marked unconformity, for at Bridgenorth the base of the Lower Bunter [f 1 ] is represented on the Geological Survey map, 61 S.E.,as approaching the base of the Permian, whereas between Enville and Claverley it rests on the highest beds of the Permian ; and Prof. Hull estimates the overlap as equivalent to about 1000 feet of strata. The horizontal extent of the overlap appears to be

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