The superficial geology of the country adjoining the coasts of southwest Lancashire : comprised in sheet 90, quarter sheet 91 S. W., parts of 89 N. W. and S. W., 79 N. E. and 91 S. E., of the 1 inch geological survey map of England and Wales - De Rance, C. E. (Charles Eugene), 1847-1906 (Memoirs of the Geological Survey of Great Britain. England and Wales., 1877)