In order to address this, we combined diatom abundance stratigraphy, magnetic and radiocarbon methods to build an accurate chronology for two late glacial marine sedimentary sequences, from cores TPC063 and TPC286 from the Scotia Sea, SW Atlantic.Palaeomagnetic data provide the first evidence for the Laschamp geomagnetic excursion (∼41 cal ka B. The age model was further extended to 17.3 cal ka B. through identification of the diatom abundance stratigraphy datum.Remember that the study of the sequence of layers of strata is called lithostratigraphy, and the study of the sequence of in these same layers is called biostratigraphy.Both of these studies were pioneered in the early 19th century by a British geologist named William Smith, who was one of the very first to figure out that you could identify the same sequences of rocks and fossils in different parts of England (an excellent book about Smith and his life is The Map That Changed the World by Simon Winchester).These key index species should be relatively abundant, short-lived taxa that are easy to recognise and as geographically widespread as possible.
Layers of sedimentary rocks, or strata, are stacked in vertical sequences, with the oldest layers being on the bottom, and getting younger as we go up through the layers.
Monday, February 21, 2011Reconstructing the History of Life Part III: "Absolute" Age Dating Wednesday, February 9, 2011Reconstructing The History Of Life Part II: Biostratigraphic Correlation Wednesday, February 2, 2011 Jeffrey Martz Poncha Springs CO USA This is a blog about paleontology (the study of the history of life on Earth through the fossil record) with an emphasis on vertebrate paleontology, the study of extinct vertebrates (animals with backbones).
The methodology and findings of paleontology will be discussed, as well as related issues such as evolutionary theory.
The blogger is a vertebrate paleontologist specializing in the Triassic Period, the Beginning of the Age of Dinosaurs.
My posts are presented as opinion and commentary and do not represent the views of Lab Spaces Productions, LLC, my employer, or my educational institution...possible the formalization of the term Tertiary but also had a more far-reaching effect.