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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Facies and Bed Thickness Distributions of Limestones: NOTES
David N. Lumsden
ABSTRACT
Bed thicknesses in terrigenous clastics have long been observed to follow a lognormal distribution but data on carbonate rocks are rare. Studies of facies intervals, determined by detailed thin-section analysis, and bed thicknesses, described in field notes, for the Bird Spring Group and Callville Formation (Pennsylvanian and Permian) of southern Nevada have revealed that limestones also follow a lognormal trend. This is true for the separately investigated limestone facies (F1: micrite; F2: sparsely fossiliferous micrite; F3: packed biomicrite or pelmicrite; F4: biopelsparite) and for the data resulting when all these facies are combined.
The universality of a lognormal distribution for populations of facies and bed thicknesses in limestones precludes the use of Markov chain analysis in which lithologic identifications are made at equal intervals along a vertical section.
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