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Eocene

Hierarchy:Phanerozoic Cenozoic  Paleogene
   Eocene
Classification:Epoch (as per International Commission on Stratigraphy)
Top:33.9 Ma
Base:56.0 Ma
Preceeds:Oligocene Rupelian
Follows:Paleocene Thanetian
Primary Divisions:PriabonianBartonianLutetianYpresian
Fossil Record

Data via PaleoBioDB


Taxa Count Key
First appearance
Extinction
First appearance and extinction
Related precursors
KingdomPhylumClassTaxa Count
AnimaliaAnnelida Clitellata4
AnimaliaAnnelida Polychaeta44
AnimaliaArthropoda Arachnida1,275
AnimaliaArthropoda Branchiopoda9
AnimaliaArthropoda Cephalocarida1
AnimaliaArthropoda Chilopoda25
AnimaliaArthropoda Diplopoda35
AnimaliaArthropoda Entognatha4
AnimaliaArthropoda Insecta9,846
AnimaliaArthropoda Malacostraca908
AnimaliaArthropoda Maxillopoda56
AnimaliaArthropoda Merostomata1
AnimaliaArthropoda Ostracoda296
AnimaliaArthropoda Pauropoda5
AnimaliaArthropoda Pycnogonida1
AnimaliaArthropoda Remipedia1
AnimaliaArthropoda Symphyla8
AnimaliaBrachiopoda Craniata11
AnimaliaBrachiopoda Lingulata12
AnimaliaBrachiopoda Rhynchonellata230
AnimaliaBrachiopoda Strophomenata7
AnimaliaBryozoa Gymnolaemata646
AnimaliaBryozoa Phylactolaemata1
AnimaliaBryozoa Stenolaemata102
AnimaliaChordata Actinopterygii317
AnimaliaChordata Amphibia21
AnimaliaChordata Ascidiacea1
AnimaliaChordata Aves301
AnimaliaChordata Cephalaspidomorphi1
AnimaliaChordata Elasmobranchii220
AnimaliaChordata Holocephali3
AnimaliaChordata Mammalia5,467
AnimaliaChordata Myxini1
AnimaliaChordata Reptilia1,085
AnimaliaChordata Sarcopterygii6
AnimaliaCnidaria Anthozoa830
AnimaliaCnidaria Cubozoa1
AnimaliaCnidaria Hydrozoa26
AnimaliaCnidaria Scyphozoa2
AnimaliaEchinodermata Asteroidea87
AnimaliaEchinodermata Crinoidea36
AnimaliaEchinodermata Echinoidea382
AnimaliaEchinodermata Holothuroidea67
AnimaliaEchinodermata Ophiuroidea45
AnimaliaHemichordata Enteropneusta4
AnimaliaHemichordata Pterobranchia2
AnimaliaMollusca Bivalvia1,591
AnimaliaMollusca Cephalopoda105
AnimaliaMollusca Gastropoda2,991
AnimaliaMollusca Monoplacophora1
AnimaliaMollusca Polyplacophora26
AnimaliaMollusca Scaphopoda50
AnimaliaNematoda Adenophorea3
AnimaliaNematoda Secernentea2
AnimaliaPlatyhelminthes Trematoda1
AnimaliaPorifera Calcarea11
AnimaliaPorifera Demospongiae18
AnimaliaPorifera Hexactinellida89
AnimaliaPorifera Homoscleromorpha1
AnimaliaTardigrada Eutardigrada5
AnimaliaTardigrada Heterotardigrada1
BacteriaCyanobacteria Cyanophyceae5
ChromistaForaminifera Globothalamea410
ChromistaForaminifera Monothalamea34
ChromistaForaminifera Tubothalamea73
ChromistaHaptophyta Prymnesiophyceae47
ChromistaMyzozoa Dinophyceae35
ChromistaOchrophyta Bacillariophyceae40
ChromistaOchrophyta Chrysophyceae1
ChromistaOchrophyta Dictyochophyceae5
ChromistaOchrophyta Phaeophyceae2
ChromistaRadiozoa Polycystina215
FungiAscomycota Eurotiomycetes1
FungiAscomycota Sordariomycetes2
FungiBasidiomycota Agaricomycetes4
PlantaeBryophyta Bryopsida6
PlantaeBryophyta Sphagnopsida2
PlantaeCharophyta Charophyceae45
PlantaeCharophyta Zygnematophyceae2
PlantaeChlorophyta Chlorophyceae6
PlantaeChlorophyta Trebouxiophyceae2
PlantaeChlorophyta Ulvophyceae19
PlantaeMarchantiophyta Jungermanniopsida1
PlantaeMarchantiophyta Marchantiopsida4
PlantaeRhodophyta Florideophyceae62
PlantaeRhodophyta Rhodophyceae1
PlantaeTracheophyta Cycadopsida24
PlantaeTracheophyta Ginkgoopsida8
PlantaeTracheophyta Gnetopsida9
PlantaeTracheophyta Liliopsida118
PlantaeTracheophyta Lycopodiopsida31
PlantaeTracheophyta Magnoliopsida1,029
PlantaeTracheophyta Pinopsida173
PlantaeTracheophyta Polypodiopsida110
ProtozoaAmoebozoa Lobosa1
Moderate, cooling climate.

Archaic mammals (e.g. Creodonts, Condylarths, Uintatheres, etc.) flourish and continue to develop during the epoch. Appearance of several "modern" mammal families. Primitive whales diversify. First grasses.

Reglaciation of Antarctica and formation of its ice cap; Azolla event triggers ice age, and the Icehouse Earth climate that would follow it to this day, from the settlement and decay of seafloor algae drawing in massive amounts of atmospheric carbon dioxide, lowering it from 3800 ppmv down to 650 ppmv.

End of Laramide and Sevier Orogenies of the Rocky Mountains in North America. Orogeny of the Alps in Europe begins. Hellenic Orogeny begins in Greece and Aegean Sea.
 

Geologic Events

Event NameTypeAgeArea
Popigai ImpactImpact Event35.7 ± 0.2 MaAnabarskii massif, Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai), Eastern-Siberian Region, Russia
Kerguelen Plateau formation (concludes)Volcanic Activity119 - 34 MaSouthern Indian Ocean
Pangaea breakup (concludes)Continental Breakup175 - 55 MaGlobal
Andean orogeny (ongoing)OrogenyMaximum Age: 200 MaSouth America
Laurasia supercontinent (concludes)Supercontinent215 - 55 MaNorthern Hemisphere


Overview of geological time

List all geological events
 
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