IV.—On the Unconformability of the Keuper and Bunter

¹ Hull, Geology of the Country around Wigan, Mem. Geol. Surv. p. 31. Triassic and Permian Rocks, p. 87.

² This interesting section is within an hour's walk of either Breadsall or West Hallam Stations on the Great Northern Railway.

³ The dips in the section do not correspond with those here given, because the section is not taken along the true line of dip.

⁴ It was the fancied textural resemblance of these red rocks of the Lower Bunter Sandstone and Coal-measures to Rothliegende, which appears to have led the Government surveyors to club them together and map them as Permian Lower Red Sandstone. At Dale Mill a similar mistake was made with characteristic massively-bedded Coal-measure sandstone.