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Geography of the US in the Late Cretaceous Period
Geography of the US in the Late Cretaceous Period

Late Cretaceous (100mya - 65mya) refers to the second half of the Cretaceous Period, named after the famous white chalk cliffs of southern England, which date from this time. The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of Chalk (ʧɔːk is a soft white porous Sedimentary rock, a form of Limestone composed of the Mineral Calcite. England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland Rocks deposited during the Late Cretaceous Period are referred to as the Upper Cretaceous Series.

Contents

Dinosaurs

This was a period of great success for dinosaurs, with many new types appearing and diversifying, such as the Tyrannosaurs, duck bills, Ankylosauridae, and horned dinosaurs in Asiamerica (Western North America and eastern Asia), and Titanosaurs and Abelisaurs in Gondwana. Tyrannosauridae (or tyrannosaurids, meaning "tyrant lizards" is a family of Coelurosaurian Theropod Dinosaurs which Hadrosaurids or duck-billed Dinosaurs are members of the family Hadrosauridae, and include Ornithopods such as Edmontosaurus An ankylosaurid is a member of the Ankylosauridae family of armored dinosaurs that evolved 125 Million years ago (along with another family of Ceratopsidae (sometimes spelled Ceratopidae) is a speciose group of Marginocephalian Dinosaurs including Triceratops and Styracosaurus Asiamerica was a large island formed from the Laurasian landmass and separated by shallow continental seas from Eurasia to the West and eastern North America Titanosaurs (members of the groups Titanosauria and/or Titanosauroidea) were a diverse group of sauropod Dinosaurs which included Saltasaurus Abelisauridae (meaning "Abel's lizards" is a family (or Clade) of Ceratosaurian Theropod Dinosaurs Abelisaurids thrived Gondwana (ɡɒnˈdwɑːnə originally Gondwanaland) was a southern Supercontinent that existed about 500 to 200 Ma ago

Birds

Birds became increasingly common and diverse, replacing the pterosaurs which retreated to increasingly specialised ecological niches. Birds ( class Aves) are bipedal endothermic ( Warm-blooded) Vertebrate animals that lay eggs. For other meanings see Pterodactyl (disambiguation. Pterosaurs (ˈtɛrəsɔr from the Greek πτερόσαυρος pterosauros

Marine Life

In the seas, mosasaurs suddenly appeared and underwent a spectacular evolutionary radiation. Mosasaurs (from Latin Mosa meaning the ' Meuse river ' in the Netherlands and Greek sauros meaning 'lizard' were serpentine marine Modern sharks also appeared and giant-penguin-like polycotylid pliosaurs (3 meters long) and huge long-necked elasmosaurs (13 meters long) also diversified. Polycotylidae is a family of Plesiosaurs from the Cretaceous, a sister group to the Elasmosauridae. The Pliosaurs ("more lizards" were marine reptiles from the Jurassic and Cretaceous Periods. Elasmosauridae was the family of Plesiosaurs. They had the longest necks of the plesiosaurs and survived from the Early Jurassic to the end of the These predators fed on the numerous teleost fishes, which in turn evolved into new advanced and modern forms (Neoteleostei). Teleostei is one of three infraclasses in class Actinopterygii, the ray-finned fishes

Flowering Plants

Near the end of the Cretaceous Period, flowering plants diversified and didelphid marsupials and primitive placental mammals also became common. The flowering plants or angiosperms ( Angiospermae or Magnoliophyta) are the most widespread group Didelphimorphia is the order of common opossums of the Western Hemisphere. Marsupials are an Infraclass of Mammals characterized by a distinctive pouch (called the marsupium) in which females carry their young through See also Evolution of mammals Eutheria ("true beast" are a group of Mammals consisting of Placental mammals plus all extinct Mammals Mammals ( class Mammalia) are a class of Vertebrate Animals characterized by the presence of Sweat glands, including sweat glands

KT Mass Extinction

The period was ended by the Cretaceous-Tertiary extinction event. The Cretaceous–Tertiary extinction event, which occurred approximately ( Ma) was a large-scale mass extinction of animal and plant species in a geologically

See also

Cretaceous period
Lower/Early Cretaceous Upper/Late Cretaceous
Berriasian | Valanginian | Hauterivian
Barremian | Aptian | Albian		 Cenomanian | Turonian | Coniacian
Santonian | Campanian | Maastrichtian
This is an incomplete list that briefly describes all known organisms that were Extant during the Maastrichtian, a stage of the Late Cretaceous Period which extended The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of The Early Cretaceous ( timestratigraphic name or the Lower Cretaceous ( logstratigraphic name is the earlier of the two major divisions of the Cretaceous In the Geologic timescale, Berriasian is a stage of the Early Cretaceous epoch, and the first of the entire Cretaceous period In the Geologic timescale, Valanginian is a stage of the Early Cretaceous epoch. The Hauterivian is a stage of the Early Cretaceous Epoch. It spans the time between 136 The Barremian Faunal stage was a period of geological time between 130 Aptian stage is a Faunal stage of the Early Cretaceous epoch in the Geologic timescale, that extends from 125 Albian ( French Albion, from Alba = Aube in France) is a stage of the Cretaceous period. |-|The Cenomanian age (also known as Woodbinian by the [[ICS]] is the first or earliest or oldest Geochronological "geologic age" The Turonian is a stage of the Late Cretaceous Epoch. It spans the time between 93 The Coniacian is a stage of the Late Cretaceous Epoch. It spans the time between 89 The Santonian is a Faunal stage of the Late Cretaceous Epoch. The Campanian is a stage on the Geologic time scale occurring from 83 The Maastrichtian is the last stage of the Cretaceous period, and therefore of the Mesozoic era.
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