Note 115 — Chapter XXXII · PERMIAN VOLCANOES OF ENGLAND
Reading edition
This district is represented in Sheets 55 N.E. and 61 S.E. of the Geological Survey. The microscopic structure of the larger mass on the west side of the coal-field, and the variations in the minute structure of the intrusion which forms a long ridge on the east side, are described by Mr. Allport, Quart. Journ. Geol. Soc. xxx. pp. 550, 551.