This Thesis describes an investigation of the geological causes and influences affecting the existence of linear features seen on air photographs of areas where the bedrock is obscured by superficial deposits. Detailed stereoscopic studies were made of the appearance of these features, and their causes were then investigated in the field. During the fieldwork all the factors considered likely to influence their existence were recorded, and similar data were recorded where important linear geological occurrences had not been detected as linear features on the air photographs. The results were then studied in an attempt to find a relationship between the appearance of a linear feature and its cause, and also to discover factors that inhibit the detection of important geological data on air photographs. The linear features selected were found to include nine tenths of the boundaries of different types of superficial deposits, three quarters of all the buried faults and three quarters of the buried rock contacts. Half the remaining soil boundaries, faults and rock contacts also showed as less distinct features on the photographs. Further information on the state of the hidden bedrock was shown by other linear features that were caused by bedding planes, joints, surface gullys, fracture zones and dykes. Some natural linear features originated within the superficial cover, such as those caused by landslides, glacial effects, old coastlines and man—made features. Each type of geological phenomena tended to have a varied appearance in different settings, and a series of characteristics were studied for each linear feature so that a variety of interpretation criteria were secured to give a photogeologist as sound a basis as possible on which to make decisions.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:623102 |
| Date | January 1968 |
| Creators | Norman, John Wakelin |
| Publisher | Imperial College London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/10044/1/16018 |
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