Cretaceous - Wikipedia
Web1991. The Cretaceous ( IPA: / krɪˈteɪʃəs / krih-TAY-shəs) [2] is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the ...
Early Cretaceous - Wikipedia
WebVertical axis scale: millions of years ago. / 44.3925; 5.5119. The Early Cretaceous ( geochronological name) or the Lower Cretaceous ( chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 145 Ma to 100.5 Ma.
Late Cretaceous - Wikipedia
WebThe Late Cretaceous (100.5–66 Ma) is the younger of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after creta, the Latin word for the white limestone known as chalk. The chalk of northern France and the white cliffs of ...
The Cretaceous Period - University of California Museum of …
WebThe Cretaceous is defined as the period between 145.5 and 65.5 million years ago,* the last period of the Mesozoic Era, following the Jurassic and ending with the extinction of the dinosaurs (except birds). By the beginning of the Cretaceous, the supercontinent Pangea was already rifting apart, and by the mid-Cretaceous, it had split into ...
Cretaceous - Simple English Wikipedia, the free encyclopedia
WebThe Cretaceous period is the ninth and longest period in the Phanerozoic eon, lasting 80 million years from 145 to 65 million years ago (mya). It followed the Jurassic period, and is the third and last period of the Mesozoic era. After it came the Cainozoic era. [1] The Cretaceous period has just two very long epochs : Upper Cretaceous 100.5 ...
Cretaceous Period Facts and Information | National Geographic
WebCretaceous Period. During this period, oceans formed as land shifted and broke out of one big supercontinent into smaller ones. Continents were on the move in the Cretaceous, busy remodeling the ...
Cretaceous Period - Mesozoic, Paleogene, Cenozoic | Britannica
WebCretaceous Period - Mesozoic, Paleogene, Cenozoic: The rocks that were either deposited or formed during the Cretaceous Period make up the Cretaceous System. The Cretaceous System is divided into two rock series, Lower and Upper, which correspond to units of time known as the Early Cretaceous Epoch (145 million to 100.5 million years ago) and the Late Cretaceous Epoch (100.5 million to 66 ...
Cretaceous–Paleogene extinction event - Wikipedia
WebThe Cretaceous–Paleogene ( K–Pg) extinction event, [a] also known as the Cretaceous–Tertiary (K–T) extinction, [b] was a sudden mass extinction of three-quarters of the plant and animal species on Earth, [2] [3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.
Polar forests of the Cretaceous - Wikipedia
WebDuring the Cretaceous, temperate forests thrived at polar latitudes, [2] as there was a notable difference from current conditions at high latitudes during the Cretaceous polar seasons. [3] The duration of summer sunlight and winter darkness lasted for approximately 5 months each. [4] This variation in light is thought to have played a critical ...
Cretaceous Terrestrial Revolution - Wikipedia
WebThe Cretaceous Terrestrial Revolution (abbreviated KTR ), also known as the Angiosperm Terrestrial Revolution ( ATR) by authors who consider it to have lasted into the Palaeogene, [1] describes the intense floral diversification of flowering plants ( angiosperms) and the coevolution of pollinating insects, as well as the subsequent faunal ...
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