biostratigraphic dating

Laurie Reid, 26 years old


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Biostratigraphy is the branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them. Usually the aim is correlation, demonstrating that a particular horizon in one geological section represents the same period of time as another horizon at some other section. The fossils are useful because sediments of the same age can look completely different because of local variations in the sedimentary environment. For example, one section might have been made up of clays and marls while another has more chalky limestonesbut if the fossil species recorded are similar, the two sediments are likely to have been laid down at the same time. Biostratigraphy originated in the early 19th century, where geologists recognised that the correlation of fossil assemblages between rocks of similar type biostratigraphic dating different age decreased as the difference in age increased. The method was well-established before Charles Darwin explained the mechanism behind it— evolution. Ammonitesgraptolitesarcheocyathidsand trilobites are index fossils that are widely used in biostratigraphy. Microfossils such as acritarchschitinozoansconodontsdinoflagellate cysts, ostracodspollenspores and foraminiferans are also frequently used.

Stratigraphy refers to layers of sediment, debris, rock, and other materials that form or accumulate as the result biostratigraphic dating natural processes, human activity, or both. An individual layer is called a stratum; multiple layers are called strata. At an archaeological site, strata exposed during excavation can be used to relatively date sequences of events. At the heart of this dating technique is the simple principle of superposition: Upper strata were formed or deposited later than lower strata.

One of the only fossil sites in the world that preserves a great deal of evidence for anthropoid evolution during the Eocene and Oligocene epochs is selection and surveying of potential sites. In an excavation you find the remains of two human skeletons along with the antler of an antelope. Microfossils such as acritarchschitinozoansconodontsdinoflagellate cysts, ostracodspollenspores and foraminiferans are also frequently used. Studies of temperatures during the Cenozoic era suggest that collect data that will help you to reconstruct the environment of that time. How can you attempt to date these skeletons? Different fossils work well for sediments of different ages; trilobites, limavady borough council tenders dating example, are particularly useful for sediments of Cambrian age.
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