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A part of paleontology concerned with the study of the conditions and deposition order of sedimentary rocks.



a branch of stratigraphy which studies the distribution of fossil remains of organisms in sedimentary deposits with the object of determining the relative age and the correlations between layers of the same age in different territories. The task of biostratigraphy is the elaboration of scales of the relative age of layers (in various degrees of detail and of various scopes, but in zonal layers in particular). The succession of biostratigraphic zones reflects the change in geological cross section of fossil remains from a group of extinct organisms of different taxonomic classes or their systems. Of special importance in the differentiation of zones, and above all of biozones, are groups of extinct organisms that had relatively short life-spans but that attained widespread distribution, significant abundance, and variety (for example, nummulites, graptolites, and dinosaurs). Zones are frequently based on stages in the evolution of certain rapidly changing groups of extinct organisms (for example, corals of the subclass Rugosa). The study of the remains of ancient microscopic organisms (micropaleontology), the quantity of which can be extremely large even in small specimens (for example, from deep chinks), is important for the goals of biostratigraphy. Remnants of planktonic organisms (foraminifers, algae, and others) that were carried for great distances by currents allow zones of great territorial expanse to be distinguished. Fossil remains of plant spores and pollen, which were carried for great distances by the wind, are important for correlating deposits of maritime or continental origin that are of the same age. Biostratigraphy makes broad use of the methods of paleoecology for reconstructing the conditions under which ancient organisms existed in order to distinguish complexes of organisms of the same age living in different conditions from complexes of organism of different ages living in similar conditions.


Menner, V. V. “Biostratigraficheskie osnovy sopostavleniia morskikh, lagunnykh i kontinental’nykh svit.” Tr. geologicheskogo instituta AN SSSR, 1962, issue 65.
Stratigraficheskaia klassifikalsiia, terminologiia i nomenklatura. Leningrad, 1965.
Stepanov, D. L. Printsipy i metody biostratigraficheskikh issledovanii. Leningrad, 1958.


References in periodicals archive ?
The conference has gained a lot of interest over time as one of the premier forums in the region that brings together technological and up-to-date geological, geophysical, geochemical, biostratigraphic advances in the region.
Subgeneric identification and biostratigraphic utility of late Pleistocene prairie dogs (Cynomys, Sciuridae) from the Great Plains.
Based on the anatomical, palaeobiographical and biostratigraphic information available, the most probable evolutionary scenario for this group is that the Pliopithecoidea were the first Catarrhini to disperse from Africa to Eurasia, where they experienced an evolutionary radiation in a continent initially deserted of other anthropoids (apes)," David Alba, the project leader and a researcher at the Catalan Institute for Palaeontology at the Autonomous University of Barcelona (UAB), aid.
The biostratigraphic ranges of Calamagras murivorus and Geringophis depressus are now extended into the Whitneyan North American Land Mammal Age.
The remaining papers address geological, geophysical, biostratigraphic, and seismological investigations of smaller regions within the boundary zone from Oregon to southeastern California.
It's pretty clear there are major environmental changes that occur at this moment, and they're clearly evident in the biostratigraphic records across North America," Kennett said.
This biostratigraphic correlation allows for more detailed evolutionary studies of these early mammalian faunas, and provides further insight into the overall biostratigraphy of the region during this critical time in mammalian evolution.
They state, "It is essential to have some biostratigraphic constraints on the polarity zone pattern resolved from any given section in order to propose a non-ambiguous .
These studies will include gamma ray logs, lithology, dip meter logs, Cedar Strat calls on formation tops and biostratigraphic verification (all subject to data availability).
This was achieved by cross-correlating biostratigraphic zonations deduced from paleontological studies with the magnetic polarity sequences observed in sedimentary sections and revealed from the magnetic stripes of the seafloor.