Comparative Ichnology of Shelf-Sea and Deep-Sea Chalk

Comparative Ichnology of Shelf-Sea and Deep-Sea Chalk

All chalk is a fine-grained pelagic sediment derived from calcareous microplankton and nannoplankton. However, "shelf-sea" chalk (deposited in hundreds of meters of water) differs from "deep-sea" chalk (deposited in thousands of meters of water) in several paleontologic and sedim...

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Veröffentlicht in:Journal of paleontology 1984-03, Vol.58 (2), p.322-332
Hauptverfasser: Ekdale, A. A., Bromley, R. G.
Format: Artikel
Sprache:eng
Schlagworte:
Chalk
Chondrites
Crustaceans
Drilling
Flint
Geology
Limestones
Seas
Sediments
Trace fossils
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container_title Journal of paleontology
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creator Ekdale, A. A.
Bromley, R. G.
description All chalk is a fine-grained pelagic sediment derived from calcareous microplankton and nannoplankton. However, "shelf-sea" chalk (deposited in hundreds of meters of water) differs from "deep-sea" chalk (deposited in thousands of meters of water) in several paleontologic and sedimentologic respects. Unlike deep-sea chalk, shelf-sea chalk characteristically contains abundant megafossils, flints, omission surfaces, hardgrounds, borings and early diagenetic mineralization (pyrite, glauconite and phosphate) of trace fossils and clasts. Trace fossil associations are dominated by Thalassinoides and other crustacean burrows in most shelf-sea chalk sections; trace fossil associations in deep-sea chalk cores are dominated by Chrondrites, Planolites and Zoophycos.
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Unlike deep-sea chalk, shelf-sea chalk characteristically contains abundant megafossils, flints, omission surfaces, hardgrounds, borings and early diagenetic mineralization (pyrite, glauconite and phosphate) of trace fossils and clasts. Trace fossil associations are dominated by Thalassinoides and other crustacean burrows in most shelf-sea chalk sections; trace fossil associations in deep-sea chalk cores are dominated by Chrondrites, Planolites and Zoophycos.</abstract><pub>Society of Economic Paleontologists and Mineralogists and the Paleontological Society</pub><tpages>11</tpages></addata></record>
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source Jstor Complete Legacy
subjects Chalk
Chondrites
Crustaceans
Drilling
Flint
Geology
Limestones
Seas
Sediments
Trace fossils
title Comparative Ichnology of Shelf-Sea and Deep-Sea Chalk
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