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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 lasted from about 56 to 33.9 million years ago (Ma). It is the second
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 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
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
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
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
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
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 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
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. They
Phorusrhacidae
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
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
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
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
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
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
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 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
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)
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
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
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
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
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
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
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
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
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
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 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
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
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
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
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
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
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
Family of insects
Eocene (Ypresian) Asthenochrysa †Cimbrochrysa Schlüter, 1982 Fur Formation, Denmark, Eocene (Ypresian) Florissant Formation, Colorado, USA Eocene (Priabonian)
Chrysopidae
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
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
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
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
Storms, 1896 (Middle Eocene of Belgium) †Ellaserrata Day, 2003 (Early Eocene of Italy) †Kreyenhagenius David, 1946 (Late Eocene/Early Oligocene of California
Sparidae
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
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)
Extinct genus of European artiodactyls
Artiodactyla. It was endemic to western Europe and lived from the Late Eocene to the Early Oligocene, about 37 to 32.5 million years ago. The taxonomic
Amphimeryx
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
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
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
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
Extinct family of mammals
rhinocerotoids, native to Asia and Eastern Europe that originated in the Eocene epoch and lived until the beginning of the Miocene. They represent some
Paraceratheriidae
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
Family of mammals
whales") is an extinct family of early whales that lived during the Early Eocene in northern South Asia. Unlike modern cetaceans, they had well-developed
Pakicetidae
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
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
Middle Eocene from the northern Tethys Ocean and the Pacific coast of South America. Two genera are known: Blochius Volta, 1800 (Early Eocene of Italy)
Blochiidae
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
Family of fishes with caudal spines
Swainson, 1839 Several extinct genera are known from fossils dating from the Eocene to Miocene: A particularly large diversity of fossil surgeonfish is known
Acanthuridae
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 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
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
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
Extinct family of ungulates
the Northern Hemisphere (Asia, Europe, and North America) from the late Eocene to the early Miocene epochs, about 38 to 19 million years ago. Their large
Entelodontidae
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)
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
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
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
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
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
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
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
Genus of molluscs
fossils of the genus are known from the Late Eocene Hoko River Formation, in Washington State and from Late-Eocene to Early Oligocene sediments in Kazakhstan
Nautilus_(genus)
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
Extinct genus of mammals
("Lake Moeris' beast") is an extinct genus of basal proboscideans from the Eocene of North and West Africa. The first specimen was discovered in strata from
Moeritherium
Type of amber from the Baltic area
home of its largest known deposits. It was produced sometime during the Eocene epoch, but exactly when is controversial. It has been estimated that this
Baltic_amber
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
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 snakes
largest snake ever recorded. It lived about 40 million years ago during the Eocene epoch of the Paleogene Period, in the Paratethys Sea, within the northern
Gigantophis
Genus of birds (fossil)
Eocene period. It contains the single species Mesetaornis polaris. "Mesetaornis". PaleoBioDB. Retrieved 20 May 2025. Jadwiszczak, P. (2006). "Eocene penguins
Mesetaornis
Clade of birds
Early Eocene) Paraprefica (Early Eocene?) Archaeotrogonidae (Early Eocene of England ? – Late Eocene/Early Oligocene of France) Hassiavis (Middle Eocene of
Strisores
Flowering genus, rose family Rosaceae
collardii Axelrod, North America (Idaho), Eocene Malus kingiensis Budants, Kamchatka Peninsula, Russia, Eocene Malus florissantensis (Cockerell) MacGinitie
Malus
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
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
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 family of mammals
North American artiodactyls (even-toed ungulates) that lived during the Eocene through Pliocene. While early members of the group were hornless, in later
Protoceratidae
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)
Genus of aquatic plants
record: Azolla intertrappea Sahni & H.S. Rao, 1934 (Eocene, India) Azolla berryi Brown, 1934 (Eocene, Green River Formation, Wyoming) Azolla prisca Chandler
Azolla
Order 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
Marine geological formation in western Turkmenistan
Danatinskaya, Danatinsk, Russian: Danata Svita) is an earliest Eocene to Middle Eocene sedimentary succession located in Turkmenistan. It is mostly famous
Danata_Formation
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
Family of fishes
genera in the world. The fossil record of this family dates back to the Eocene epoch. Living bristlemouths were discovered by William Beebe in the early
Gonostomatidae
Family of fishes
(Early Eocene of Italy) †Paretrumeus Daniltshenko, 1980 (Oligocene of North Caucasus, Russia) †Trollichthys Marramà & Carnevale, 2014 (Early Eocene of Italy)
Dussumieriidae
Extinct genus of carnivorous ungulate from Eocene epoch
ruler", is an extinct genus of artiodactyl that lived during the Middle Eocene in what is now China. The genus was first described by Henry Fairfield Osborn
Andrewsarchus
Extinct genus of birds
is an extinct genus of bird that lived during the Ypresian stage of the Eocene epoch. Prefica nivea is |known from the Green River Formation of Wyoming
Prefica
Impact crater in the Eastern United States of America
shore of North America about 35.5 ± 0.3 million years ago, in the late Eocene epoch. It is one of the best-preserved "wet-target" impact craters in the
Chesapeake_Bay_impact_crater
Extinct genus of mammals
extinct genus of amynodont that lived in North America during the Middle Eocene, from the late Bridgerian to the late Uintan land mammal age. Several species
Amynodon
Extinct genus of omomyine primate
Uintanius is a genus of omomyine primate known from Eocene North America. Uintanius has been compared to Omomys in dentition, with both genera bearing
Uintanius
Extinct genus of primates
adapiform primate that lived in North America during the early to middle Eocene. Known from many geologic formations, including the Bridger Basin and the
Notharctus
EOCENE
EOCENE
EOCENE
EOCENE
Boy/Male
English
Bridge protector.
Surname or Lastname
English
English : variant spelling of Cockrell.
Girl/Female
Indian, Tamil
Garden; Lucky
Girl/Female
Indian, Tamil
Related to Thirukural
Girl/Female
Hindu, Indian, Telugu
Gem
Girl/Female
Indian
Lucky
Girl/Female
Australian, French, Hebrew
He who Supplants
Girl/Female
Assamese, Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Oriya, Sanskrit, Sindhi, Tamil, Telugu, Traditional
Progress
Boy/Male
Arabic
Beauty; Handsome; Combination of Hasan and Hussein
Boy/Male
American, British, Christian, English, German
Willful; Bright; Well Spring; Resolute
EOCENE
EOCENE
EOCENE
EOCENE
EOCENE
n.
An extinct eocene bird from New Mexico, larger than the ostrich.
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.
The Eocene formation.
n.
A group of beds of the same age or period; as, the Eocene formation.
n.
A genus of large eocene birds from the Paris basin.
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.
n.
A genus of large extinct Eocene mammals from Wyoming; -- called also Uintatherium. See Illustration in Appendix.
n.
An extinct Eocene bird having the jaws strongly serrated, or dentated, but destitute of true teeth. It was found near London.
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.
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.
a.
More recent than the Eocene, that is, including both the Miocene and Pliocene divisions of the Tertiary.
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 American Eocene mammals allied to the horse, but having four toes in front and three behind.
a.
Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods.
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.