Depth/Rank relations of high-volatile bituminous coals

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Abstract
High-volatile bituminous coals from depths ranging between 10,000 and 15,000 ft in oil-prospecting wells in Taranaki, New Zealand, show an increase in calorific value with depth of 280 Btu/lb/1,000 ft.In European Carboniferous high-volatile bituminous coalfields the calorific value increases with depth at 500 Btu/1,000 ft.In Taranaki the geothermal gradient within the coal measures is about 19°f/1,000 ft; if it was higher in Europe in proportion to the rates of increase of calorific value, the inferred geothermal gradient was exceptionally high in the Carboniferous compared with the present day.

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