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biostratigraphy
(redirected from biostratigraphically)

    Also found in: Encyclopedia 0.01 sec.
bi·o·stra·tig·ra·phy  (b-str-tgr-f)
n.
The study of the spatial and temporal distribution of fossil organisms, often interpolated with radiometric, geochemical, and paleoenvironmental information as a means of dating rock strata.
biostratigraphy  (b-str-tgr-f)
The study and categorization of rock strata based on their fossil content and distribution. Biostratigraphic data are often considered together with radiometric and paleoenvironmental data as a means of dating rock strata. Compare lithostratigraphy.
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The latest Ordovician is biostratigraphically dated in the westernmost Baltic section (drill core S-7; Ulst 1992), where strata with some Hirnantia brachiopods are overlain by graptolite-bearing rocks, most likely of the Normalograptus extraordinarius Zone (Fig.
The succession of Hirnantian events based on data from Baltica: ... by Kaljo, Dimitri; Hints, Linda; Mannik, Peep; Nolvak, Jaak / Estonian Journal of Earth Sciences
Most are biostratigraphically based, but other criteria have been used, such as the iridium spike at the base Cenozoic, the carbon isotope anomaly at the base of the Eocene, and a specific Milankovitch cycle at the base of the Pleistocene.
A Geologic Time Scale 2004 by Fensome, Rob / Geoscience Canada
[FIGURE 4 OMITTED] Regardless of the small thickness of the Leetse Formation in the Saka section, its sequence is biostratigraphically the most complete on the North Estonian Klint.
Lower Ordovician Leetse Formation in the North Estonian Klint ... by Viira, Viive; Mens, Kaisa; Nemliher, Juri / Proceedings of the Estonian Academy of Sciences: Geology
 
 
 
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