Along a narrow swath from Nottingham through to Hartlepool, broad shallow depressions up to 100m in diameter and, more rarely, scarp-edged subsidence hollows are observed. These topographical features coincide with the sub-crop of the Permian strata beneath the Quaternary deposits and are attributed to the dissolution of sub-surface gypsum. Boreholes (<150 m deep) prove the existence of several layers of gypsum within the Permian geological succession.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:492912 |
| Date | January 2009 |
| Creators | Sargent, Colin |
| Publisher | Durham University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://etheses.dur.ac.uk/1338/ |
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