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• 10:52, 3 February 2022 Scotfot talk contribs uploaded File:GA Image 0440.jpg (Figure 6 Diagrams to illustrate the history of the Blackheath subsidences. Fig. 1 Original Denehole, with narrow well-preserved Shaft, passing through Eocene Clays and Sands, and ending in a cavity in the Chalk. Fig. 2 Denehole Shaft, stopped up, erosion of hollow at base of Pebble Beds. Fig. 3 Denehole, after the subsidence (drawn to scale). {{Template:GA excursions1860-1890}})