Early Liassic Trace Fossil Assemblages from the Holy Cross Mountains, Poland: Their Distribution in Continental and Marginal Marine Environments
Grzegorz Pieńkowski, 1985. "Early Liassic Trace Fossil Assemblages from the Holy Cross Mountains, Poland: Their Distribution in Continental and Marginal Marine Environments", Biogenic Structures: Their Use in Interpreting Depositional Environments, H. Allen Curran
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In Early Liassic continental deposits from the northern slope of the Holy Cross Mountains, Poland, trace fossils are very rare and the assemblage is not diverse. Only simple feeding structures (fodinichia) and crawling traces (repichnia) are present, and these are mostly associated with levee or distal crevasse deposits.
In brackish-marine deposits, which form the major part of the Holy Cross Lower Liassic sequence, trace fossils are much more numerous and diverse. However, compared to other Jurassic ichnocoenoses from fully marine environments, the Holy Cross Early Liassic brackish water forms are generally smaller and less diverse, and spreiten burrows are rare.
Based on detailed descriptions of 26 bore holes and numerous outcrops, the usefulness of trace fossils in differentiating shore-prograding from barrier-lagoon and deltaic sequences is confirmed. With bore hole materials, trace fossils are of primary importance in making this differentiation.
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Organisms of one sort or another today inhabit virtually every sediment environment on Earth, and the rock record tells us that this has been the case through the greater part of our planet’s history. Furthermore, organisms leave their mark in most sedimentary settings, either directly in the form of body fossils or indirectly as biogenic structures. In addition to their often profound modifying effects on substrates, ancient biogenic structures preserve a record of organism behavioral activity in response to substrate and other paleoenvironmental controls. Thus, biogenic structures can be highly useful as facies indicators and can provide valuable clues to the interpretation of paleodepositional environments. The purpose of this volume is to present a broad spectrum of case-book examples of the use of biogenic structures in the interpretation of depositional environments.