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[11] [12] Thus, the criteria, i.e. (1.) its sediments being all of the same age, (2.) it consisting of sediments deposited during a single interglacial period, and (3,) as originally defined by Leverett in 1898 consist of interglacial sediments, by which the Yarmouthian (Yarmouth) Interglacial (Stage) was defined and recognized have all been ...
Reconstruction era (1865–1877) (Some of this time period is known as the "Old West".) Gilded Age (1877–1896) Fourth Party System (1896–1932) Progressive Era (1896–1917) United States in World War I (1917–1918) Roaring Twenties (1920–1929) Fifth Party System (1932–1980) Great Depression (1929–1939)
The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch / Series . Its approximate time range is 113.0 ± 1.0 Ma to 100.5 ± 0.9 Ma (million years ago).
The Tortonian is in the geologic time scale an age or stage of the late Miocene that spans the time between 11.608 ± 0.005 Ma and 7.246 ± 0.005 Ma (million years ago) [citation needed]. It follows the Serravallian and is followed by the Messinian .
Mastodons arrived in North America by crossing the Bering land bridge from the old world during the Miocene as well. [148] The oreodonts became extinct during the Pliocene. [146] By the time the Pliocene ended more modern carnivores like wolves and cats appeared. Notable among the latter group were the saber-toothed cats. [141]
This work assessed the geologic history of the currently defined eons and eras of the pre-Cambrian, [note 2] and the proposals in the "Geological Time Scale" books 2004, [74] 2012, [5] and 2020. [75] Their recommend revisions [4] of the pre-Cryogenian geologic time scale were (changes from the current scale [v2023/09] are italicised):
The Turonian is, in the ICS' geologic timescale, the second age in the Late Cretaceous Epoch, or a stage in the Upper Cretaceous Series. It spans the time between 93.9 ± 0.8 Ma and 89.8 ± 1 Ma (million years ago). The Turonian is preceded by the Cenomanian Stage and underlies the Coniacian Stage. [3]
Geologic time shown in a diagram called a geological clock, showing the relative lengths of the eons of Earth's history and noting major events The geological history of Earth follows the major geological events in Earth's past based on the geologic time scale , a system of chronological measurement based on the study of the planet's rock ...