About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 43 (1959)

Issue: 10. (October)

First Page: 2516

Last Page: 2517

Title: Analysis of Previous HitFactorsNext Hit Previous HitAffectingNext Hit Quantitative Previous HitEstimatesNext Hit of Organism Abundance: ABSTRACT

Author(s): Louis S. Kornicker

Article Type: Meeting abstract

Abstract:

Analyses of the distribution of dead organisms in recent sediments is strongly influenced by the method used to established and report abundance counts. Comparison of abundance counts from recent and ancient strata are affected by the composition of the sediment, its history, and the type of sample upon which counts are based.

Examination of the physical relation between weight and volume sediment samples, and comparison of Previous HitestimatesTop of organism abundance obtained from equal-volume and equal-weight samples of recent sediment, show that kinds of minerals forming the sediment have little effect on abundance distribution patterns determined by counting the number of specimens in samples of a given weight

End_Page 2516------------------------------

or volume, and that variation in sediment porosity probably is the major factor responsible for differences between organism counts based on equal-weight samples and those based on equal-volume samples.

Consideration of the diagenetic processes of compaction and cementation that affect organism abundance shows that, for sediments which have not been materially changed by processes like interstratal solution, replacement, and recrystallization, abundance counts from recent and ancient sediments are more comparable if clays and shales are reported on the basis of equal-weight samples, and unlithified and lithified sands are reported on the basis of equal-volume samples.

End_of_Article - Last_Page 2517------------

Copyright 1997 American Association of Petroleum Geologists