Subject ASC00011cu
The Quarterly journal of the Geological Society of London.
v.56 (1900), Page 441 (1900)
Smithsonian Libraries
BHL Page 41487793
Keywords
geology survey cross-section Long Mountain Upper Ludlow Heldre Hill Old Dingle Mill Upper Heldre fossils Monograptus grapholites heldre Wenlock Shale County Bridge Old Dingle-Mill Geology Lower Ludlow Wenlock Shales fauna graptolites