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The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. ... 2016, [65] and 2020. [66] However, since ...
This is a list of Global Boundary Stratotype Sections and Points.Since 1977, Global Boundary Stratotype Sections and Points (abbreviated GSSPs) are internationally agreed upon reference points on stratigraphic sections of rock which define the lower boundaries of stages on the geologic time scale.
In the stratigraphy sub-discipline of geology, a Global Standard Stratigraphic Age, abbreviated GSSA, is a chronological reference point and criterion in the geologic record used to define the boundaries (an internationally sanctioned benchmark point) between different geological periods, epochs or ages on the overall geologic time scale in a chronostratigraphically useful rock layer.
One of its main aims, a project begun in 1974, is to establish a multidisciplinary standard and global geologic time scale that will ease paleontological and geobiological comparisons region to region by benchmarks with stringent and rigorous strata criteria called Global Boundary Stratotype Section and Points (GSSPs) within the fossil record.
The following five timelines show the geologic time scale to scale. The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon. The second timeline shows an expanded view of the most recent eon.
Felix M. Gradstein (born 1941, in the Netherlands) is a Dutch-Canadian academic and a pioneer in quantitative stratigraphy and geologic time scale.At the University of Utrecht, he studied paleontology and stratigraphy, obtaining his Ph.D. taking a novel biometrical approach in micropaleontology, [1] under the supervision of Professor CW Drooger.
February 2020 [3] The Bartonian is, in the International Commission on Stratigraphy 's (ICS) geologic time scale , a stage or age in the middle of the Eocene Epoch or Series . The Bartonian Age spans the time between 41.03 and 37.71 Ma .
2020 [3] Calabrian is a subdivision of the Pleistocene Epoch of the geologic time scale , defined as 1.8 Ma—774,000 years ago ± 5,000 years, a period of ~ 1.026 million years . The end of the stage is defined by the last magnetic pole reversal (781 ± 5 Ka) and plunge into an ice age and global drying possibly colder and drier than the late ...