In the geologic timescale, the Aptian is the age of the Lower Cretaceous epoch of the Cretaceousperiod of the Mesozoicera of the Phanerozoiceon that is comprehended between 125 and 112 million years ago, approximately. The Aptian age succeeds the Barremian age and precedes the Albian age, all in the same epoch. The geologic time scale is used by geologists and other scientists to describe the timing and relationships between events that have occurred during the history of the Earth. ... A geologic age is a time period on the geologic timescale delimited by major geologic or paleontologic events. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 135 mya) to the beginning of the Paleocene epoch of the Tertiary period (65 mya). ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 146 MYA) to the beginning of the Paleocene epoch of the Tertiary period (65. ... In geology, a period or age is a time span of many millions of years that are assumed to have had similar characteristics. ... The Mesozoic is one of three geologic eras of Phanerozoic eon. ... The table and timeline of geologic periods presented here is in accordance with the dates and nomenclature proposed by the International Commission on Stratigraphy. ... The Phanerozoic (occasionally Phaenerozoic) Eon is the period of geologic time during which abundant animal life has existed. ... In general usage, an eon (also spelled Aeon) is a very long period of time. ... The Barremian faunal stage was a period of geological time between 117 and 113 million years ago. ... Jump to: navigation, search Albian (Fr. ...
The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 146 MYA) to the beginning of the Paleocene epoch of the Tertiary period (65. ... The Early Cretaceous (timestratigraphic name) or the Lower Cretaceous (logstratigraphic name), is the earlier of the two major divisions of the Cretaceous period. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 135 mya) to the beginning of the Paleocene epoch of the Tertiary period (65 mya). ... In the geologic timescale, the Berriasian is the age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Fanerozoic eon that is comprehended between 145 million 500 thousand and 140 million 200 thousand years ago, approximatedly. ... In the geologic timescale, Valanginian is an age of the Lower Cretaceous epoch of the Cretaceous period of the Mesozoic era of the Phanerozoic eon. ... The Barremian faunal stage was a period of geological time between 117 and 113 million years ago. ... Jump to: navigation, search Albian (Fr. ... Jump to: navigation, search The Campanian is a stage on the geologic time scale occuring from 83. ... The Maastrichtian is the last age of the Cretaceous period, and therefore of the Mesozoic era. ... The Mesozoic is one of three geologic eras of Phanerozoic eon. ... The Triassic is a geologic period that extends from about 245 to 202 million years ago (mya). ... Jump to: navigation, search The Jurassic period is a major unit of the geologic timescale that extends from about 200 Ma (million years ago) at the end of the Triassic to 146 Ma at the beginning of the Cretaceous. ... The Cretaceous period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic period (about 146 MYA) to the beginning of the Paleocene epoch of the Tertiary period (65. ...
The Aptian was a long age, the second-longest of the Mesozoic.
This last event -- or something else -- caused a dramatic increase in temperatures in the mid-Aptian (Jenkyns and Wilson, 1999), and a significant turnover of land fauna in the Late Aptian and across the Aptian-Albian boundary.
The Aptian saw the first ceratopsians, almost the last stegosaurs, the enormous Sauroposeidon and the diminutive Gobiconodon, the simultaneous evolution of the first of the swift, unarmored iguanodont- hadrosaur group, and the definitive members of nature's ultimate tanks, the nodosaurs.
Parts of the Flysch of the eastern Alps, the Biancone of Lombardy, and argile scagliose of Emilia, are of Aptianage; so also are the "Trinity Beds" of North America.
Deposits of bauxite occur in the Aptian hippurite limestone at Les Baux near Arles, and in the Pyrenees.
The Aptian rocks are generally clays, marls and green glauconitic sands with occasional limestones.
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