Abstract
THE Geological Survey of Great Britain produces geological maps distinguishing strata with particular lithological characters and ages ; thus Chalk is singled out from other limestones and given a particular colour on small-scale geological maps ; on larger-scale maps certain hard bands have been used to divide the formation into Lower, Middle and Upper Chalk ; likewise, some argillaceous strata of widespread distribution containing marine fossils are now used to divide the Coal Measures into Lower, Middle and Upper Coal Measures.
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References
See also Summary of Progress of the Geological Survey of Great Britain and Museum of Practical Geology for 1954, 38 (1955).
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STUBBLEFIELD, C. Nomenclature of the Keuper Series. Nature 187, 869 (1960). https://doi.org/10.1038/187869a0
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DOI: https://doi.org/10.1038/187869a0
