Gregory has maintained (Dead Heart of Australia, 1906, pp. 273-341) that the ascent of water in these wells is due to the tension of the included gases and the pressure of overlying sheets of rocks, and that some of the water is of plutonic origin.'
In most cases, slides also detach head deposits overlying bedrock.
The underlying bedrock is chalk, with overlying river gravels.
Up to 1 mm of softened carious dentine was left overlying the pulpal floor prior to Ozone treatment.
The soil type is chalky loam overlying clay, mostly Grade Ill with some Grade Il.
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