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Encyclopedia > Paleocene

The Paleocene, "early dawn of the recent", is a geologic epoch that lasted from 65.5 ± 0.3 Ma to 55.8 ± 0.2 Ma (million years ago). It is the first epoch of the Palaeogene Period in the modern Cenozoic era. As with most other older geologic periods, the strata that define the epoch's beginning and end are well identified but the exact date of the end is uncertain. A division of geologic time less than a period and greater than an age. ... Mega-annum, usually abbreviated as Ma, is a unit of time equal to one million years. ... Mega-annum, usually abbreviated as Ma, is a unit of time equal to one million years. ... Palaeogene (alternatively Paleogene) period is a unit of geologic time that began 65 and ended 23 million years ago. ... A geologic period is a subdivision of geologic time that divides an era into smaller timeframes. ... The Cenozoic Era (IPA pronunciation: ); sometimes Caenozoic Era in the United Kingdom) meaning new life (Greek kainos = new + zoe = life) is the most recent of the three classic geological eras. ... A geologic era is a subdivision of geologic time that is a separate classification that divides the Phanerozoic Eon into three parts timeframes. ... 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. ... Goldenville Strata exposed at a quarry in Bedford, Canada. ...


The Paleocene epoch immediately followed the mass extinction event at the end of the Cretaceous, known as the K-T boundary (Cretaceous - Tertiary), which marks the demise of the dinosaurs. The die-off of the dinosaurs left unfilled ecological niches worldwide, and the name "Paleocene" comes from Greek and refers to the "old(er) (paleo) – new (ceno)" fauna that arose during the epoch, prior to the emergence of modern mammalian orders in the Eocene. For the Big Finish Productions audio play, see The Extinction Event. ... The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i. ... The Cretaceous-Tertiary (KT) extinction event, also known as the KT boundary (from German: Kreide-Tertiär-Grenzschicht), was a period of massive extinction of species, about 65. ... The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i. ... For other uses, see Tertiary (disambiguation). ... Orders Saurischia    Sauropodomorpha    Theropoda Ornithischia Dinosaurs are giant reptiles that dominated the terrestrial ecosystem for most of their 165-million year existence. ... Fauna is a collective term for animal life. ... Subclasses Allotheria* Order Multituberculata (extinct) Order Volaticotheria (extinct) Order Palaeoryctoides (extinct) Order Triconodonta (extinct) Prototheria Order Monotremata Theria Infraclass Marsupialia Infraclass Eutheria The mammals are the class of vertebrate animals characterized by the production of milk in females for the nourishment of young, from mammary glands present on most species... Linnaean taxonomy classifies living things into a hierarchy, originally starting with kingdoms. ... The Eocene epoch (55. ...

Paleogene period
Paleocene epoch Eocene epoch Oligocene epoch
Danian | Selandian
Thanetian
Ypresian | Lutetian
Bartonian | Priabonian
Rupelian | Chattian

Contents

Paleogene (alternatively Palaeogene) period is a unit of geologic time that began 65 and ended 23 million years ago. ... The Eocene epoch (55. ... The Oligocene epoch is a geologic period of time that extends from about 34 million to 23 million years before the present. ... The Danian (also known as the Montian) is the first stage of the Paleocene Epoch. ... Selandian is a stage of the middle Paleocene Epoch. ... The Thanetian (also known as the Landenian or the Heersian) is the last stage of the Paleocene Epoch. ... The Ypresian is the first stage of the Eocene Epoch. ... The Lutetian is a stage of the middle Eocene Epoch. ... In the geologic timescale, the Bartonian is the age of the Eocene epoch of the Paleogene period of the Cenozoic era of the Fanerozoic eon that is comprehended between 40 million 400 thousand and 37 million 200 thousand years ago, approximatedly. ... The Priabonian (also known as Jacksonian or Runangan) is the final stage of the Eocene Epoch. ... The Rupelian (also known as Stampian, Tongrian, Latdorfian, or Vicksburgian) is the first of two stages of the Oligocene Epoch. ... The Chattian (also known as Chickasawhayan) is the second and final of two stages of the Oligocene Epoch. ...

Boundaries and subdivisions

The K-T boundary that marks the separation between Cretaceous and Paleocene is visible in the geological record of much of the Earth by a discontinuity in the fossil fauna, with high iridium levels. There is also fossil evidence of abrupt changes in flora and fauna. There is some evidence that a substantial but very short-lived climatic change may have occurred in the very early decades of the Paleocene. There are several theories about the cause of the K-T extinction event, with most evidence supporting the impact of a 10 km diameter asteroid near Yucatan, Mexico. General Name, Symbol, Number iridium, Ir, 77 Chemical series transition metals Group, Period, Block 9, 6, d Appearance silvery white Atomic mass 192. ... In Botany a Flora (or Floræ) is a collective term for plant life and can also refer to a descriptive catalogue of the plants of any geographical area, geological period, etc. ... Fauna is a collective term for animal life. ... DIAMETER is an AAA protocol (Authentication, Authorization and Accounting) succeeding its predecessor RADIUS. // The name is a pun on the RADIUS protocol, which is the predecessor (a diameter is twice the radius). ... 253 Mathilde, a C-type asteroid. ... The Yucatán Peninsula separates the Caribbean Sea from the Gulf of Mexico. ...


The end of the Paleocene (55.5/54.8 Ma) was marked by one of the most significant periods of global change during the Cenozoic. The Paleocene-Eocene Thermal Maximum upset oceanic and atmospheric circulation and led to the extinction of numerous deep-sea benthic foraminifera and a major turnover in mammals on land. Climate change during the last 65 million years. ...


The Paleocene is usually broken into the Early, Middle, and Late Paleocene sub-epochs, which correspond to the following faunal stages, from youngest to oldest: Faunal stages are a subdivision of geologic time used primarily by paleontologists who study fossils rather than by geologists who study rock formations. ...

Thanetian (58.7 ± 0.2 – 55.8 ± 0.2 Ma)
Selandian (61.7 ± 0.2 – 58.7 ± 0.2 Ma)
Danian (65.5 ± 0.3 – 61.7 ± 0.2 Ma)

The Thanetian (also known as the Landenian or the Heersian) is the last stage of the Paleocene Epoch. ... Selandian is a stage of the middle Paleocene Epoch. ... The Danian (also known as the Montian) is the first stage of the Paleocene Epoch. ...

Climate

The early Paleocene was slightly cooler than the preceding Cretaceous, though temperatures rose again late in the epoch. The climate was warm and humid world-wide, with subtropical vegetation growing in Greenland and Patagonia. The poles were cool and temperate; North America, Europe, Australia and southern South America were warm and temperate; tropical climates characterized equatorial areas; and north and south of the Equator, climates were hot and arid. [1] In orange the area most commonly defined as Patagonia. ... World map showing North America A satellite composite image of North America. ... This article is 150 kilobytes or more in size. ... South America South America is a continent crossed by the equator, with most of its area in the Southern Hemisphere. ... World map showing the equator in red For other uses, see Equator (disambiguation). ...


Paleogeography

In many ways, the Paleocene continued processes that had begun during the late Cretaceous Period. During the Paleocene, the continents continued to drift toward their present positions. North America and Asia were still intermittently joined by a land bridge, while Greenland and North America were beginning to separate. [2] The Laramide orogeny of the late Cretaceous continued to uplift the Rocky Mountains in the American west, which ended in the succeeding epoch. Color-coded regions of the world based on the seven commonly-recognised continents Dymaxion map by Buckminster Fuller shows land masses with minimal distortion as nearly one continuous continent A continent is one of several large landmasses on Earth. ... World map showing the location of Asia. ... The Laramide orogeny was a period of mountain building in western North America, which started in the Late Cretaceous, 70 to 80 million years ago, and ended 35 to 55 million years ago. ... Rockies may also refer to the National League Baseball team, the Colorado Rockies. ...


South and North America remained separated by equatorial seas (they joined during the Neogene); the components of the former southern supercontinent Gondwanaland continued to split apart, with Africa, South America, Antarctica and Australia pulling away from each other. Africa was heading north towards Europe, slowly closing the Tethys Ocean, and India began its migration to Asia that would lead to a tectonic collision and the formation of the Himalayas. Neogene Period is a unit of geologic time consisting of the Miocene, Pliocene, Pleistocene, and Holocene epochs. ... This article is about the ancient supercontinent of Gondwana. ... A world map showing the continent of Africa. ... This article is 150 kilobytes or more in size. ... Tethys Ocean (here labeled Tethys Sea) divides Pangea into two supercontinents, Laurasia and Gondwana The Tethys Ocean was a Mesozoic era ocean that existed between the continents of Gondwana and Laurasia before the opening of the Indian Ocean. ... Perspective view of the Himalayas and Mount Everest as seen from space looking south-south-east from over the Tibetan Plateau. ...


The inland seas in North America (Western Interior Seaway) and Europe had receded by the beginning of the Paleocene, making way for new land-based flora and fauna. The Western Interior Seaway, also called the Cretaceous Seaway and the North American Inland Sea, was a huge inland sea that split the continent of North America into two halves during most of the early and mid-Cretaceous period. ...


Flora

Terrestrial Paleocene strata immediately overlying the K-T boundary is in places marked by a "fern spike": a bed especially rich in fern fossils.[3] Ferns are often the first species to colonize areas damaged by forest fires; thus the fern spike may indicate post-Chicxulub Crater devastation.[4] Classes Psilotopsida Equisetopsida Marattiopsida Polypodiopsida A fern is any one of a group of about 20,000 species of plants classified in the phylum or division Pteridophyta, also known as Filicophyta. ... Fire in San Bernardino, California Mountains (image taken from the International Space Station) A wildfire, also known as a forest fire, vegetation fire, grass fire, or bushfire (in Australasia), is an uncontrolled fire in wildland often caused by lightning; other common causes are human carelessness and arson. ... Radar topography reveals the 180 kilometer (112 mile) wide ring of the crater (image courtesy NASA/JPL-Caltech) Chicxulub Crater (IPA: ) (cheek-shoo-LOOB) is an ancient impact crater buried underneath the Yucatán Peninsula, with its center located approximately underneath the town of Chicxulub, Yucatán, Mexico. ...


In general, the Paleocene is marked by the development of modern plant species. Cacti and palm trees appeared. Paleocene and later plant fossils are generally attributed to modern genera or to closely related taxa. Genera See Taxonomy of the Cactaceae A cactus (plural cactus, cacti, or cactuses) is any member of the succulent plant family Cactaceae. ... Genera Many; see list of Arecaceae genera Arecaceae (also known as Palmae or Palmaceae), the palm family, is a family of flowering plants, belonging to the monocot order Arecales. ... Three small ammonite fossils, each approximately 1. ... For other uses of the word, please see Genus (disambiguation). ...


The warm temperatures world-wide gave rise to thick tropical, sub-tropical and deciduous forest cover around the globe (the first recognizably modern rain forests) with ice-free polar regions covered with coniferous and deciduous trees. [2] With no large grazing dinosaurs to thin them, Paleocene forests were probably denser than those of the Cretaceous. A rainforest is a forested biome with high annual rainfall. ...


Flowering plants (angiosperms), first seen in the Cretaceous, continued to develop and proliferate, and along with them coevolved the insects that fed on these plants and pollinated them. Classes Magnoliopsida - Dicots Liliopsida - Monocots The flowering plants (also angiosperms or Magnoliophyta) are one of the major groups of modern plants, comprising those that produce seeds in specialized reproductive organs called flowers, where the ovulary or carpel is enclosed. ...


Fauna

Mammals

Mammals had first appeared in the Triassic and developed alongside the dinosaurs, exploiting ecological niches untouched by the larger and more famous Mesozoic animals: in the insect-rich forest underbrush and high up in the trees. These smaller mammals (as well as birds, reptiles, amphibians, and insects) survived the mass extinction at the end of the Cretaceous which wiped out the dinosaurs, and mammals diversified and spread throughout the world. Orders Subclass Monotremata Monotremata Subclass Marsupialia Didelphimorphia Paucituberculata Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Subclass Placentalia Xenarthra Dermoptera Desmostylia Scandentia Primates Rodentia Lagomorpha Insectivora Chiroptera Pholidota Carnivora Perissodactyla Artiodactyla Cetacea Afrosoricida Macroscelidea Tubulidentata Hyracoidea Proboscidea Sirenia The mammals are the class of vertebrate animals primarily characterized by the presence of mammary... The Triassic is a geologic period that extends from about 251 to 200 Ma (million years ago). ... In ecology, a niche is a term describing the position of a species or population in an ecosystem. ... The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. ...


While early mammals were small nocturnal animals with herbivorous and insectivorous diets, the demise of the dinosaurs and the beginning of the Paleocene saw mammals growing bigger, more ferocious, and finally becoming the dominant predators and spreading throughout the world. Ten million years after the death of the dinosaurs, the world was filled with rodent-like mammals, medium sized mammals scavenging in forests, and large herbivorous and carnivorous mammals hunting other mammals, birds, and reptiles.


Paleocene mammals did not yet have specialized teeth or limbs, and their brain to body mass ratios were quite low; compared to later forms, they are considered primitive, or archaic.[5] It was not until the Eocene, 55 Ma, that true modern mammals developed. Brain to body mass ratio (also known as the Encephalization Quotient - EQ) is a rough estimate of the possible intelligence of an organism. ... The Eocene epoch (55. ...


Fossil evidence from the Paleocene is scarce, and there is relatively little known about mammals of the time. Because of their small size—constant until late in the epoch—early mammal bones are not well-preserved in the fossil record, and most of what we know comes from fossil teeth (a much tougher substance), and only a few skeletons.[2]


Mammals of the Paleocene include:

  • Monotremes: three species of monotremes have survived to modern times: the duck-billed platypus, and two species of Echidnas. Monotrematum sudamericanum lived during the Paleocene.
  • Marsupials: modern kangaroos are marsupials, characterized by giving birth to embryonic babies, who crawl into the mother's pouch and suckle until they are developed. The Bolivian Pucadelphys andinus is a Paleocene example.
  • Multituberculates: the only major branch of mammals to go extinct, this rodent-like grouping includes the Paleocene Ptilodus.
  • Placentals: this grouping of mammals became the most diverse and the most successful. Members include hoofed ungulates, primates and carnivores, such as the Paleocene mesonychid.

Families †Kollikodontidae Ornithorhynchidae - Platypus Tachyglossidae - Echidnas †Steropodontidae Monotremes (monos, single + trema, hole; refers to the cloaca) are mammals that lay eggs instead of giving birth to live young like marsupials (Metatheria) and placental mammals (Eutheria). ... This article is about the monotreme mammal. ... Note: This page or section contains IPA phonetic symbols in Unicode. ... Species Obdurodon dicksoni Obdurodon insignis Monotrematum sudamericanum Obdurodon is an extinct genus of platypus containing three species. ... Orders Superorder Ameridelphia Didelphimorphia Paucituberculata Superorder Australidelphia Microbiotheria Dasyuromorphia Peramelemorphia Notoryctemorphia Diprotodontia Marsupials are mammals in which the female typically has a pouch (called the marsupium, from which the name Marsupial derives) in which it rears its young through early infancy. ... Species Macropus rufus Macropus giganteus Macropus fuliginosus Macropus antilopinus A kangaroo is any of several large animals of the Macropodidae, a marsupial family that also includes the wallabies, tree-kangaroos, wallaroos, pademelons and the Quokka, some 63 living species in all. ... Pucadelphys andinus was a marsupial species belonging to the family Didelphidae. ... Suborders   Plagiaulacida   Cimolodonta The Multituberculata are the only major branch of mammals to have become completely extinct, with no living descendants. ... Species Ptilodus is a genus of mammals from the extinct order of Multituberculata, and lived during the Paleocene in North America. ... Orders Superorder Xenarthra: Pilosa Cingulata Infraclass Epitheria: Superorder Afrotheria: Afrosoricida (Golden mole and tenrec) Macroscelidea (Elephant shrew) Tubulidentata (Aardvark) Hyracoidea (Hyrax) Proboscidea (Elephant) Sirenia (Manatee, Dugong) Superorder Laurasiatheria: Chiroptera (Bats) Insectivora (Shrews, Moles) Cetacea (Whale, dolphin) Artiodactyla (Ruminants et al) Perissodactyla(Horse et al. ... Mesonychids are an extinct order of even-toed carnivorous ungulates (hoofed animals) which looked like wolves, and were scavengers for carrion and hunters of fish. ...

Reptiles

Because of the climatic conditions of the Paleocene, reptiles were more widely distributed over the globe than at present. Among the sub-tropical reptiles found in North America during this epoch are champsosaurs (aquatic reptiles that resemble modern gharials), crocodilia, soft-shelled turtles, palaeophid snakes, varanid lizards, and Protochelydra zangerli (similar to modern snapping turtles). Orders  Crocodilia - Crocodilians scary crocodiles. ... Subtropical (or semitropical) areas are those adjacent to the tropics, usually roughly defined as the ranges 23. ... Champsosaurus is a semiaquatic reptile known from the Late Cretaceous of North America, and a member of the Choristodira. ... Binomial name Gavialis gangeticus (Gmelin, 1789) The gharial (Gavialis gangeticus) is one of two surviving members of the family Gavialidae, a long-established group of crocodile-like reptiles with long, narrow jaws. ... Families Gavialidae Alligatoridae Crocodylidae Crocodilia is an order of large reptiles that appeared about 84 million years ago in the Late Cretaceous Period (Campanian stage). ... Turtles and terapins may mean: plural of turtle Teenage Mutant Ninja Turtles The Turtles band Turtles band Turtles Music stores See also: Turtle (disambiguation) This is a disambiguation page: a list of articles associated with the same title. ... Families Acrochordidae Aniliidae Anomalepididae Anomochilidae Atractaspididae Boidae Bolyeriidae Colubridae Cylindrophiidae Elapidae Hydrophiidae Leptotyphlopidae Loxocemidae Pythonidae Tropidophiidae Typhlopidae Uropeltidae Viperidae Xenopeltidae Snakes are cold blooded legless reptiles closely related to lizards, which share the order Squamata. ... Species Many, see text. ... Genera See text Snapping turtles (or snappers) are large, New World freshwater turtles of the family Chelydridae. ...


Examples of champsosaurs of the Paleocene include Champsosaurus gigas, the largest champsosaur ever discovered. This creature was unusual among Paleocene reptiles in that C. gigas became larger than its known Mesozoic ancestors: C. gigas is more than twice the length of the largest Cretaceous specimens (3 meters versus 1.5 meters). Reptiles as a whole decreased in size after the K-T event. Champsosaurs declined towards the end of the Paleocene and became extinct at the end of the Eocene. The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. ...


Examples of Paleocene crocodylians are the euschian crocodylid Leidyosuchus formidabilis, the apex predator and the largest animal of the Wannagan Creek fauna, and the alligatorid Wannaganosuchus. Genera Mecistops Crocodylus Osteolaemus See full taxonomy. ... This article or section does not adequately cite its references or sources. ... The Wannagan Creek site is a fossil site found in the South Unit of Theodore Roosevelt National Park of North Dakota, USA. The site is Paleocene in age, approximately 60 million years old. ... Living Genera Alligator Caiman Melanosuchus Paleosuchus Alligators and caimans are reptiles closely related to the crocodiles and forming the family Alligatoridae (sometimes regarded instead as the subfamily Alligatorinae). ...


Dinosaurs may have survived to some extent into the early Danian stage of the Paleocene Epoch circa 64.5 Mya. The controversial evidence for such is a hadrosaur leg bone found from Paleocene strata from 64.5 Mya in Australia.


Birds

Birds began to diversify during the epoch, occupying new niches. Most modern bird types had appeared by mid-Cenozoic, including perching birds, cranes, hawks, pelicans, herons, owls, ducks, pigeons, loons, and woodpeckers. Families Many, see text A passerine is a bird of the giant order Passeriformes. ... Genera Grus Anthropoides Balearica Bugeranus Cranes are large, long-legged and long-necked birds of the order Gruiformes, and family Gruidae. ... Hawks redirects here. ... Species Pelecanus occidentalis Pelecanus thagus Pelecanus erythrorhynchos Pelecanus onocrotalus Pelecanus crispus Pelecanus rufescens Pelecanus philippensis Pelecanus conspicillatus A pelican is any of several very large water birds with a distinctive pouch under the beak belonging to the bird family Pelecanidae. ... Genera See text. ... Families Strigidae Tytonidae Ogygoptyngidae (fossil) Palaeoglaucidae (fossil) Protostrigidae (fossil) Sophiornithidae (fossil) Synonyms Strigidae sensu Sibley & Ahlquist Owls are solitary and nocturnal birds of prey. ... // Subfamilies Dendrocygninae Oxyurinae Anatinae Merginae Duck is the common name for a number of species in the Anatidae family of birds. ... Subfamilies see article text Feral Rock Pigeon beside Weiming Lake, Peking University Pigeons (which are also known as rock doves) and doves comprise the family Columbidae within the order Columbiformes, including some 300 species of near passerine birds. ... Global distribution of Gaviidae (breeding and winter ranges combined) Species Gavia stellata Gavia arctica Gavia pacifica Gavia immer Gavia adamsii The Loons (N.Am. ... Genera Melanerpes Sphyrapicus Xiphidiopicus Dendropicos Dendrocopos Picoides Veniliornis Campethera Geocolaptes Dinopium Meiglyptes Hemicircus Micropternus Picus Mulleripicus Dryocopus Celeus Piculus Colaptes Campephilus Chrysocolaptes Reinwardtipicus Blythipicus Gecinulus Sapheopipo For other uses, see Woodpecker (disambiguation). ...


Large carnivorous flightless birds (also called Terror Birds) have been found in late Paleocene fossils, including the fearsome Gastornis in Europe. Phorusrhacoids were large carnivorous flightless birds that were the dominant predators in South America during the Cenozoic, 62-2. ... Gastornis is an extinct genus of large flightless birds that lived during the late Paleocene and Eocene periods of the Cenozoic. ...


Early owl types such as Ogygoptynx and Berruornis appear in the late Paleocene in the United States and France, respectively.


Oceans

Warm seas circulated throughout the world, including the poles. The earliest Paleocene featured a low diversity and abundance of marine life, but this trend reversed later in the epoch. [2] Tropical conditions gave rise to abundant marine life, including coral reefs. With the demise of marine reptiles at the end of the Cretaceous, sharks became the top predators. At the end of the Cretaceous, there were also extinctions of the ammonites and many species of foraminifera. Some of the biodiversity of a coral reef. ... Orders Carcharhiniformes Heterodontiformes Hexanchiformes Lamniformes Orectolobiformes Pristiophoriformes Squaliformes Squatiniformes Symmoriida(extinct) Sharks (superorder Selachimorpha) are fish with a full cartilaginous skeleton[1] and a streamlined body. ... For the extinct mollusc see Ammonite. ... Orders Allogromiida Carterinida Fusulinida - extinct Globigerinida Involutinida - extinct Lagenida Miliolida Robertinida Rotaliida Silicoloculinida Spirillinida Textulariida incertae sedis    Xenophyophorea    Reticulomyxa The Foraminifera, or forams for short, are a large group of amoeboid protists with reticulating pseudopods, fine strands that branch and merge to form a dynamic net. ...


Marine faunas also came to resemble modern faunas, with only the marine mammals and the Charcharinid sharks missing.


References

  1. ^ PaleoMap Project: Paleocene Climate
  2. ^ a b c d Hooker, J.J., "Tertiary to Present: Paleocene", pp. 459-465, Vol. 5. of Selley, Richard C., L. Robin McCocks, and Ian R. Plimer, Encyclopedia of Geology, Oxford: Elsevier Limited, 2005. ISBN 0-12-636380-3
  3. ^ Vajda, Vivi. "Global Disruption of Vegetation at the Cretaceous-Tertiary Boundary – A Comparison Between the Northern and Southern Hemisphere Palynological Signals" (Accessed 7/15/06) http://gsa.confex.com/gsa/2004AM/finalprogram/abstract_81135.htm
  4. ^ Phillip Bigelow. "The K-T Boundary In The Hell Creek Formation" (Accessed 7/15/06) http://www.scn.org/~bh162/k-t_boundary.html
  5. ^ http://www.palaeos.com/Cenozoic/Paleocene/Paleocene.htm Palaeos.com: "The Paleocene". Accessed 11/26/06.
  • Ogg, Jim; June, 2004, Overview of Global Boundary Stratotype Sections and Points (GSSP's) http://www.stratigraphy.org/gssp.htm Accessed April 30, 2006.

External links

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Paleocene

  Results from FactBites:
 
Paleocene - Wikipedia, the free encyclopedia (1332 words)
The end of the Paleocene (55.5/54.8 Ma) was marked by one of the most significant periods of global change during the Cenozoic, a sudden global change, the Paleocene-Eocene Thermal Maximum, which upset oceanic and atmospheric circulation and led to the extinction of numerous deep-sea benthic foraminifera and on land, a major turnover in mammals.
Paleocene and later plant fossils are generally attributed to modern genera or to closely related taxa.
Examples of Paleocene crocodylians are the euschian crocodile Leidyosuchus formidabilis, the apex predator and the largest animal of the Wannagan Creek fauna, and the alligator Wannaganosuchus.
Paleocene (326 words)
The name Paleocene refers to the "old(er)-new" faunas that arose after the demise of the dinosaurs and prior to the emergence of modern mammalian orders in the Eocene.
The Paleocene follows the Cretaceous Period and is followed by the Eocene Epoch.
The end of the Cretaceous/start of the Paleocene is marked by a major, and extensively studied, extinction event.
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