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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 42 (1958)

Issue: 3. (March)

First Page: 640

Last Page: 655

Title: Primary Factors in Biostratigraphy

Author(s): Harry E. Wheeler (2)


Three-dimensional contiguous biostratigraphic units, like rock units, may be regarded as belonging to three conceptually distinct categories: (1) units defined essentially by position in vertical succession may include zonule and zone; (2) the term biosome is proposed for mutually intertongued units defined on the basis of both vertical and lateral positional relationships; and (3) biofacies units, which are quantitative lateral biostratigraphic variants of a stratigraphic interval.

Environmentally controlled biostratigraphic-lithostratigraphic analogies are: (1) zonule-lithostrome, (2) biosome-lithosome, (3) biofacies-lithofacies, and (4) biotope-lithotope; but evolution-controlled zones have no lithic analogy.

Faunally barren entities must be recognized in each of the biostratigraphic categories.

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