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Second epoch of the Paleogene Period
The Eocene (IPA: /ˈiːəsiːn, ˈiːoʊ-/ EE-ə-seen, EE-oh-) is a geological epoch that began about 56 million years ago (Ma). It is the second epoch of the
Eocene
Global warming about 55 million years ago
The Paleocene–Eocene thermal maximum (PETM), alternatively "Eocene thermal maximum 1 (ETM1)" and formerly known as the "Initial Eocene" or "Late Paleocene
Paleocene–Eocene thermal maximum
Paleocene–Eocene_thermal_maximum
Mass extinction event 33.9 million years ago
O–S The Eocene–Oligocene extinction event, also called the Eocene-Oligocene transition (EOT), is the transition between the end of the Eocene and the
Eocene–Oligocene extinction event
Eocene–Oligocene_extinction_event
First period of the Cenozoic Era
the tenth period of the Phanerozoic and is divided into the Paleocene, Eocene, and Oligocene epochs. The earlier term Tertiary Period was used to define
Paleogene
Third epoch of the Paleogene Period
sparsity of extant forms of molluscs. The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and
Oligocene
Third and current era of the Phanerozoic Eon
warmer than today, particularly during the Paleocene–Eocene Thermal Maximum. However, the Eocene to Oligocene transition and the Quaternary glaciation
Cenozoic
Hyperthermal event
Eocene Thermal Maximum 3 (ETM3), also known as the K or X event, was a hyperthermal event that occurred during the middle of the Ypresian stage of the
Eocene_Thermal_Maximum_3
First age of the Eocene Epoch
of the Eocene. It spans the time between 56 and 48.07 Ma, is preceded by the Thanetian Age (part of the Paleocene) and is followed by the Eocene Lutetian
Ypresian
The Middle Eocene Climatic Optimum (MECO), also called the Middle Eocene Thermal Maximum (METM), was a period of very warm climate that occurred during
Middle Eocene Climatic Optimum
Middle_Eocene_Climatic_Optimum
Climatic period during the Eocene epoch
The Early Eocene Climatic Optimum (EECO), also referred to as the Early Eocene Thermal Maximum (EETM), was a period of extremely warm greenhouse climatic
Early_Eocene_Climatic_Optimum
Transient period of global warming that occurred approximately 54 million years ago
Eocene Thermal Maximum 2 (ETM-2), also called H-1 or Elmo (Eocene Layer of Mysterious Origin), was a transient period of global warming that occurred
Eocene_Thermal_Maximum_2
Plant and fungi fossils from the Eocene Okanagan Highlands
The paleoflora of the Eocene Okanagan Highlands includes all plant and fungi fossils preserved in the Eocene Okanagan Highlands Lagerstätten. The highlands
Paleoflora of the Eocene Okanagan Highlands
Paleoflora_of_the_Eocene_Okanagan_Highlands
First epoch of the Paleogene Period
and καινός (kainós), meaning "new", translating to "the old part of the Eocene". The epoch is bracketed by two major events in Earth's history. The K–Pg
Paleocene
Prehistoric cetacean genus from the Late Eocene epoch
genus of large, predatory, prehistoric archaeocete whale from the late Eocene, approximately 41.3 to 33.9 million years ago (mya). First described in
Basilosaurus
Order of birds
families are known, spanning across the Northern Hemisphere, from the Early Eocene to the early Pliocene, including a variety of flightless forms like the
Struthioniformes
Genus of ancient whales
Pakicetidae, which was endemic to South Asia during the Ypresian (early Eocene) period, about 50 million years ago. It was a wolf-like mammal, about 1–2 m
Pakicetus
Extinct genus of mammals
equoid that lived in Europe and possibly the Middle East from the Middle Eocene to the Early Oligocene. It is the type genus of the Palaeotheriidae, a group
Palaeotherium
The paleofauna of the Eocene Okanagan Highlands consists of Early Eocene arthropods, vertebrates, plus rare nematodes and molluscs found in geological
Paleofauna of the Eocene Okanagan Highlands
Paleofauna_of_the_Eocene_Okanagan_Highlands
Series of Early Eocene geological formations in Canada and the United States
The Eocene Okanagan Highlands or Eocene Okanogan Highlands are a series of Early Eocene geological formations which span a 1,000 km (620 mi) transect
Eocene_Okanagan_Highlands
Extinct genus of endemic Paleogene European artiodactyls
Anoplotheriidae, which was endemic to Western Europe. It lived from the Late Eocene to the earliest Oligocene. It was the fifth fossil mammal genus to be described
Anoplotherium
Extinct family of flightless birds
Middle Eocene to the Late Pleistocene around 43 to 0.025 million years ago, though some specimens suggest that they were present since the Early Eocene. Phorusrhacids
Phorusrhacidae
Hypothetical planetary rings around Earth
Eocene impacts. An earlier proposal theorized that a tektite debris ring related to the late Eocene impact events could be responsible for the Eocene–Oligocene
Rings_of_Earth
Mountain in the state of California
Eocene Peak is a granitic summit with an elevation of 11,569 feet (3,526 m) located on the crest of the Sierra Nevada mountain range, in northern California
Eocene_Peak
Extinct genus of endemic Palaeogene European artiodactyls
Choeropotamidae. It was endemic to western Europe and lived from the Middle Eocene up to the earliest Oligocene. Choeropotamus was first described and named
Choeropotamus
Extinct species of snake
extinct snake species in the family Madtsoiidae that lived during the Middle Eocene in India. V. indicus is the only species in the genus Vasuki, known from
Vasuki_indicus
Family of snakes
family. The earliest fossil species of the family date back to the Late Eocene epoch, with earlier origins suspected. Colubrid snakes are found on every
Colubridae
Clade of birds
Boles, Walter E. (1997). "Fossil songbirds (Passeriformes) from the Early Eocene of Australia". Emu. 97 (1): 43–50. Bibcode:1997EmuAO..97...43B. doi:10.1071/MU97004
Australaves
Fossil deposit in Egypt
coastal landscape. The formation period ranges from the Middle to the Upper Eocene to the Lower Oligocene, which corresponds to an age of around 41 to 28 million
Fayum_(fossil_deposit)
Formation, representing the first record of an Eocene whale from Poland and one of the smallest fully aquatic Eocene whales reported to date. A deciduous tooth
2026_in_paleomammalogy
cetaceans is thought to have proceeded in modern day Pakistan during the Eocene epoch (56–34 mya), the second epoch of the Paleogene period of the present-extending
Evolution_of_cetaceans
Extinct genus of endemic Palaeogene European artiodactyls
other xiphodonts, was endemic to Western Europe and lived from the Middle Eocene up to the earliest Oligocene. Fossils from Montmartre in Paris, France that
Xiphodon
Extinct genus of mammals
belonging to the family Palaeotheriidae. It lived in Europe from the middle Eocene to the early Oligocene. The type species, P. minor, was described in 1804
Plagiolophus_(mammal)
Order of aquatic herbivorous mammals
hyraxes, and evolved in the Eocene 50 million years ago (mya). The Dugongidae diverged from the Trichechidae in the late Eocene or early Oligocene (30–35
Sirenia
Order of hoofed mammals
America and Asia, died out at the beginning of the Upper Eocene. Equoidea also developed in the Eocene. Palaeotheriidae are known mainly from Europe. In contrast
Perissodactyla
Extinct genus of endemic Palaeogene European artiodactyls
Xiphodontidae. It was endemic to Western Europe and lived from the Middle Eocene up to the earliest Oligocene. Haplomeryx was first established as a genus
Haplomeryx
Extinct genus of primitive horse
Its remains have been identified in North America and date to the Early Eocene (Ypresian stage). In 1876, Othniel C. Marsh described a skeleton as Eohippus
Eohippus
Extinct family of mammals
Amphiperatherium (Early Eocene to Middle Miocene, Europe; synonyms: Oxygomphius, Microtarsioides, Ceciliolemur) Asiadidelphis (Late Eocene to Early Oligocene
Herpetotheriidae
Geological formation in the Intermountain West of the United States
Colorado, Utah, and Wyoming. It comprises sediments deposited during the Early Eocene in a series of large freshwater lakes: Lake Gosiute, Lake Uinta, and Fossil
Paleobiota of the Green River Formation
Paleobiota_of_the_Green_River_Formation
Index of articles associated with the same name
Paleocene–Eocene Thermal Maximum Eocene Thermal Maximum 2 Early Eocene Climatic Optimum, also known as the Early Eocene Thermal Maximum Middle Eocene Climatic
Thermal_Maximum
Family of hoofed mammals
from fossils. The family evolved more than 50 million years ago, in the Eocene epoch, from a small, multi-toed ungulate into larger, single-toed animals
Equidae
Extinct genus of birds
genus of large, flightless birds that lived during the mid-Paleocene to mid-Eocene epochs of the Paleogene period. Most fossils have been found in Europe,
Gastornis
Meteorological hypothesis
extinction event and the Paleocene–Eocene Thermal Maximum. The Paleocene–Eocene thermal maximum (PETM), alternatively "Eocene thermal maximum 1 (ETM1)" and
Clathrate_gun_hypothesis
This is an overview of the paleofauna of the Eocene Messel Formation as explored by the Messel Pit excavations in Germany. A former quarry and now UNESCO
Paleofauna of the Messel Formation
Paleofauna_of_the_Messel_Formation
Family of spiders
record of this family was first identified from Baltic amber dating to the Eocene, although many taxa from these deposits have been reassigned to Mecysmaucheniidae
Archaeidae
Extinct species of shark
species of large mackerel shark that lived in Early Paleocene to Early Eocene, between 65 and 54 million years ago. It is considered one of first members
Otodus_obliquus
Mountain range in Punjab, Pakistan
Eocene), late Ypresian (late early Eocene) or, more recently, encompassing much of Ypresian up to early Lutetian time (early part of the early Eocene
Kala_Chitta_Range
Family of fishes
(Early Eocene of Italy) genus †Hypsocephalus Swift & Ellwood, 1972 (Late Eocene of Florida, US) genus †Lessinia Bannikov & Sorbini, 2014 (Early Eocene of
Lutjanidae
Birds from the order Strigiformes
(Early Eocene of Wyoming, U.S.) Palaeoglaux (Middle-Late Eocene of West-Central Europe) own family Palaeoglaucidae or Strigidae? Palaeobyas (Late Eocene/Early
Owl
Extinct genus of mammals
The genus was found lived in Eurasia and North America from the Middle Eocene to the Late Miocene, from 38 to 11.4 million years ago, existing for 26
Hyaenodon
2022 book by Thomas Halliday
similar to the Eocene (the preceding epoch to the Oligocene ranging from 56 million to 34 million years ago). Temperature ranges during the Eocene were a lot
Otherlands_(book)
Order of mammals
as odd-toed ungulates were in North America. Through the middle to late Eocene, many different species existed. The smallest of these were the size of
Hyracoidea
Extinct genus of snakes
family Palaeophiidae. Described species within this genus lived in the Eocene epoch, with some unnamed or questionable records from Cenomanian and Maastrichtian
Palaeophis
Origin and diversification of primates through geologic time
Eurasia and Africa during the tropical conditions of the Paleocene and Eocene. Purgatorius is the genus of the four extinct species believed to be among
Evolution_of_primates
Ice age of the last 34 million years, in particular in Antarctica
Cenozoic Ice Age, or Antarctic Glaciation, began 34 million years ago at the Eocene-Oligocene Boundary and is ongoing. It is Earth's current ice age or icehouse
Late_Cenozoic_Ice_Age
Extinct genus of carnivores
clade Carnivoraformes, that lived in North America from the early to middle Eocene. Miacis was five-clawed, similar in size to a stoat (~30 cm, tail not included)
Miacis
Extinct family of mammals in the order Carnivora
barbourofelines as nimravids again. Nimravids first appeared in the Middle Eocene in Asia, with Maofelis being the most plesiomorphic taxa. The family went
Nimravidae
Geological formation and major fossil site in Antarctica
list (link) Pezzetti, T.F.; KRISSEK, L.A (1986). "Re-evaluation of the Eocene La Meseta Formation of Seymour Island, Antarctic Peninsula". Antarctic Journal
La_Meseta_Formation
Group of mammals that walk on the tips of their toes or hooves
inherit (the reduction of digit I and V for example). By the start of the Eocene, 55 million years ago (Mya), they had diversified and spread out to occupy
Ungulate
Extinct genus of European perissodactyl
family, was endemic to western Europe and lived from the Early to Middle Eocene. Fossils of Lophiodon were first studied in 1804 when the French palaeontologist
Lophiodon
those of other fossil and extant members of the group is described from the Eocene Baltic amber by Gerbe et al. (2026). Howard et al. (2026) redescribe Praearcturus
2026 in arthropod paleontology
2026_in_arthropod_paleontology
Family of ray-finned fishes
2010 (Early Eocene of Italy) †Eocoris Bannikov & Soribini, 2010 (Early Eocene of Italy) †Labrobolcus Bannikov & Bellwood, 2015 (Early Eocene of Italy)
Wrasse
Marine geologial formation in Denmark
The Fur Formation is a marine geological formation of Ypresian (Lower Eocene Epoch, c. 56.0-54.5 Ma) age which crops out in the Limfjord region of northern
Fur_Formation
Genus of trees and shrubs
years ago which is within the Lutetian, or older middle Eocene. Stockey and Wehr report: "The Eocene was a time of rapid evolution and diversification in
Prunus
Extinct genus of early cetacean
Peru that lived during the Bartonian age of the middle Eocene. Perucetus is the largest Eocene whale, with length estimates varying from 15–16 meters
Perucetus
Family of insects
Eocene (Ypresian) Asthenochrysa †Cimbrochrysa Schlüter, 1982 Fur Formation, Denmark, Eocene (Ypresian) Florissant Formation, Colorado, USA Eocene (Priabonian)
Chrysopidae
Fourth and last Age of the Eocene Epoch
the ICS's geologic timescale, the latest age or the upper stage of the Eocene Epoch or Series. It spans the time between 37.71 and 33.9 Ma. The Priabonian
Priabonian
Extinct family of odd-toed ungulates
Perissodactyla, the order that includes horses, rhinoceroses, and tapirs from the Eocene epoch. Brontotheres had a Holarctic distribution, with the exception of
Brontotheriidae
Extinct genus of mammals
The type species Pterodon dasyuroides is known exclusively from the late Eocene to the earliest Oligocene of western Europe. The genus was first erected
Pterodon_(mammal)
Infraorder of mammals
(seals, sea lions), and Ursidae (bears), found in all continents from the Eocene, 46 million years ago, to the present. The oldest group of the clade is
Arctoidea
Family of mammals
Basilosauridae is a family of extinct cetaceans that lived during the middle to late Eocene. Basilosaurids are known from all continents including Antarctica, and are
Basilosauridae
Family of fishes
Storms, 1896 (Middle Eocene of Belgium) †Ellaserrata Day, 2003 (Early Eocene of Italy) †Kreyenhagenius David, 1946 (Late Eocene/Early Oligocene of California
Sparidae
Extinct genus of beetle
Oryctoantiquus is a genus of middle Eocene beetles in the Dynastinae clade. Oryctoantiquus is known for being the oldest known genus of Dynastinae and
Oryctoantiquus
Mass extinction event about 66 million years ago
communities. Many groups of ants were present in the Cretaceous, but in the Eocene ants became dominant and diverse, with larger colonies. Butterflies diversified
Cretaceous–Paleogene extinction event
Cretaceous–Paleogene_extinction_event
Extinct genus of frogs
frogs in the family Pyxicephalidae. Five species are known, all from the Eocene of western Europe, including France, England, and Switzerland. Specimens
Thaumastosaurus
Extinct genus of endemic Palaeogene European artiodactyls
Xiphodontidae. It was endemic to Western Europe and lived from the middle Eocene up to the earliest Oligocene. The genus was first erected by the British
Dichodon_(mammal)
Genus of extinct mammal
'pig' or 'swine') is an extinct genus of raoellid artiodactyl known from Eocene fossils in Asia. The fossils were discovered among rocks that had been collected
Indohyus
Family of fishes
from the Miocene of Algeria, and a number of species are known from the Eocene of Italy. The frogfish family, Antennariidae, has its name derived from
Frogfish
Suborder of fishes
Middle Eocene of Italy & France) Genus ?†Anorevus Bannikov & Zorzin, 2020 (Early Eocene of Italy) Genus †Eobothus Eastman, 1914 (Early Eocene of Italy)
Flatfish
soldier beetle larvae from the Cretaceous amber from Myanmar and from the Eocene Baltic amber, and find no evidence of a significant loss of morphological
2026_in_paleoentomology
Family of birds
primitive swift-like Scaniacypselus (Early–Middle Eocene) and the more modern Procypseloides (Late Eocene/Early Oligocene – Early Miocene). A prehistoric
Swift_(bird)
Common name for several species of fish
from the Early Eocene of Italy. This list of species follows FishBase: Subfamily Aphanopidinae Gill, 1863 †Genus Anenchelum (Early Eocene to Late Miocene)
Cutlassfish
Extinct genus of primates
extinct genus of primate from the Eocene Nadu Formation of China. Living about 35 million years ago during the late Eocene, Palaeohodites belongs to an extinct
Palaeohodites
Genus of extinct mammals
Formation in Pakistan, roughly 48 or 47 million years ago during the Early Eocene (Lutetian). It contains one species, Ambulocetus natans (Latin natans "swimming")
Ambulocetus
Order of mammals
years ago. Suina (including pigs) have been around since the Eocene. In the late Eocene or the Oligocene, two families stayed in Eurasia and Africa; the
Artiodactyla
Species of palm
Cretaceous through the Eocene, making its last appearance in the fossil record of North and South America in the late Eocene. Assuming the habitat of
Nypa_fruticans
Extinct genus of early artiodactyls
was endemic to western Europe and lived from the Middle Eocene (or possibly the Early Eocene) to the Early Oligocene. The type species Dichobune leporina
Dichobune
Extinct order of mammals
subfamilial richness after the end of the Early Eocene Climatic Optimum. During the middle to late Eocene, hyaenodonts, along with carnivorans, would replace
Hyaenodonta
Extinct genus of endemic Palaeogene European artiodactyls
family Anoplotheriidae. It was endemic to Europe and lived from the late Eocene to the early Oligocene. The genus was first erected as a subgenus of Dichobune
Diplobune
Eastman 1900 (Early/middle Eocene) †Paraortygoides Mayr 2000 (London Clay Early Eocene of Walton-on-the-Naze, England – middle Eocene of Messel, Germany) †P
List_of_fossil_bird_genera
Clade of birds
parenchyma in the digestive tract indicates a herbivorous diet in the Middle Eocene bird Strigogyps sapea (Ameghinornithidae)". Paläontologische Zeitschrift
Telluraves
Geologic formation in Wyoming, United States
is a sedimentary sequence deposited during the late Paleocene to early Eocene, or Clarkforkian, Wasatchian and Bridgerian in the NALMA classification
Willwood_Formation
Extinct family of artiodactyls
Palaeogene that was endemic to western Europe and lived from the Middle Eocene to the Early Oligocene. The Anoplotheriidae is divided into two subfamilies
Anoplotheriidae
Paleobiota of the Klondike Mountain Formation comprises a diverse suite of Early Eocene plants and animals recovered in North Central Washington State from the
Paleobiota of the Klondike Mountain Formation
Paleobiota_of_the_Klondike_Mountain_Formation
Suborder of fishes
placement is still uncertain. True stingray fossils become more common in the Eocene, with the extinct freshwater stingrays Heliobatis and Asterotrygon known
Stingray
Foreland basin in Venezuela
multiple stages throughout time: Late Jurassic, Late Cretaceous, Paleocene-Eocene, and the Oligocene-Holocene stages. During the break-up of Pangea, the North
Maracaibo_Basin
Family of fishes
(Early Eocene of Italy) †Progymnodon Dames, 1883 (mid-late Eocene of the United States and Romania) †Pshekhadiodon Bannikov & Tyler, 1997 (Middle Eocene of
Porcupinefish
Extinct genus of mammals
Pliolophus is an extinct equid that lived in the Early Eocene of Britain. Paleontology portal Evolution of the horse Constance Bronnert; Emmanuel Gheerbrant;
Pliolophus
Extinct suborder of mammals
Late Eocene of China, the Late Paleocene to Middle Eocene of North America where they display their maximum species diversity, the Middle Eocene of Pakistan
Tillodontia
Family of fishes
†Aramichthys (fossil; middle Eocene of Syria) Genus †Eoscomber (fossil; early Eocene of Senegal) Genus †Eoscombrus (fossil; late Eocene of California) Genus †Godsilia
Scombridae
Order of birds
documented to exist from the Early Paleocene onwards; by at least the Late Eocene, two families are known to have existed, the extant Coliidae and the longer-billed
Mousebird
EOCENE
EOCENE
EOCENE
EOCENE
Boy/Male
Hindu
Boy/Male
Australian, German, Greek, Irish, Latin
Noble Woman; Noble; Patrician
Boy/Male
Scottish
Son of Beathan.
Boy/Male
Indian, Punjabi, Sikh
Religious Divine Knowledge
Boy/Male
Teutonic
Brave.
Boy/Male
Hindu, Indian, Telugu
Lord Shiva
Boy/Male
Tamil
Great
Boy/Male
Hindu, Indian, Sanskrit
Boy; Lad
Boy/Male
Indian, Punjabi, Sikh
Victory of Virtue
Male
Scandinavian
Scandinavian form of Old High German Ricohard, RIKARD means "powerful ruler."
EOCENE
EOCENE
EOCENE
EOCENE
EOCENE
n.
A genus of large eocene birds from the Paris basin.
n. pl.
An extinct group of Mammalia found fossil in the Eocene formation. The species are related to the carnivores, ungulates, and rodents. Called also Tillodonta.
n.
An extinct genus of large Eocene ungulates allied to Dinoceras. This name is sometimes used for nearly all the known species of the group. See Dinoceras.
n.
A genus of extinct Eocene whales, remains of which have been found in the Gulf States. The species had very long and slender bodies and broad serrated teeth. See Phocodontia.
n.
An extinct eocene bird from New Mexico, larger than the ostrich.
a.
More recent than the Eocene, that is, including both the Miocene and Pliocene divisions of the Tertiary.
n.
A genus of American Eocene mammals allied to the horse, but having four toes in front and three behind.
n.
An extinct Eocene bird having the jaws strongly serrated, or dentated, but destitute of true teeth. It was found near London.
n.
The Eocene formation.
n.
A genus of large extinct Eocene mammals from Wyoming; -- called also Uintatherium. See Illustration in Appendix.
n.
A name given to the series of sandstones and schists overlying the true nummulitic formation in the Alps, and included in the Eocene Tertiary.
n.
A genus of extinct mammals from the eocene tertiary of Europe and America. Its species varied in size between the tapir and rhinoceros, and were allied to those animals, but had short, plantigrade, five-toed feet, like the elephant.
a.
Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods.
n.
A group of beds of the same age or period; as, the Eocene formation.
a.
Pertaining to the first in time of the three subdivisions into which the Tertiary formation is divided by geologists, and alluding to the approximation in its life to that of the present era; as, Eocene deposits.