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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 Polychaeta45
AnimaliaArthropoda Arachnida1,273
AnimaliaArthropoda Branchiopoda9
AnimaliaArthropoda Cephalocarida1
AnimaliaArthropoda Chilopoda25
AnimaliaArthropoda Insecta9,833
AnimaliaArthropoda Malacostraca905
AnimaliaArthropoda Maxillopoda56
AnimaliaArthropoda Ostracoda296
AnimaliaArthropoda Pauropoda5
AnimaliaArthropoda Pycnogonida1
AnimaliaArthropoda Remipedia1
AnimaliaArthropoda Symphyla7
AnimaliaBrachiopoda Craniata11
AnimaliaBrachiopoda Lingulata11
AnimaliaBrachiopoda Rhynchonellata228
AnimaliaBrachiopoda Strophomenata7
AnimaliaBryozoa Gymnolaemata646
AnimaliaBryozoa Stenolaemata102
AnimaliaChordata Actinopterygii10
AnimaliaChordata Ascidiacea1
AnimaliaChordata Aves301
AnimaliaChordata Mammalia5,459
AnimaliaChordata Reptilia1,025
AnimaliaChordata Sarcopterygii2
AnimaliaCnidaria Anthozoa828
AnimaliaCnidaria Cubozoa1
AnimaliaCnidaria Hydrozoa26
AnimaliaCnidaria Scyphozoa1
AnimaliaEchinodermata Asteroidea87
AnimaliaEchinodermata Crinoidea36
AnimaliaEchinodermata Echinoidea380
AnimaliaEchinodermata Holothuroidea66
AnimaliaEchinodermata Ophiuroidea45
AnimaliaHemichordata Enteropneusta4
AnimaliaHemichordata Pterobranchia2
AnimaliaMollusca Bivalvia1,586
AnimaliaMollusca Cephalopoda104
AnimaliaMollusca Gastropoda2,983
AnimaliaMollusca Monoplacophora1
AnimaliaMollusca Polyplacophora26
AnimaliaMollusca Scaphopoda50
AnimaliaPlatyhelminthes Trematoda1
AnimaliaPorifera Calcarea10
AnimaliaPorifera Hexactinellida89
AnimaliaTardigrada Eutardigrada5
BacteriaCyanobacteria Cyanophyceae5
ChromistaForaminifera Globothalamea410
ChromistaForaminifera Monothalamea34
ChromistaForaminifera Tubothalamea55
ChromistaHaptophyta Prymnesiophyceae47
ChromistaMyzozoa Dinophyceae3
ChromistaOchrophyta Bacillariophyceae32
ChromistaOchrophyta Chrysophyceae1
ChromistaOchrophyta Dictyochophyceae3
ChromistaRadiozoa Polycystina181
PlantaeBryophyta Bryopsida6
PlantaeBryophyta Sphagnopsida2
PlantaeCharophyta Charophyceae45
PlantaeCharophyta Zygnematophyceae2
PlantaeChlorophyta Chlorophyceae6
PlantaeChlorophyta Trebouxiophyceae2
PlantaeChlorophyta Ulvophyceae18
PlantaeMarchantiophyta Jungermanniopsida1
PlantaeMarchantiophyta Marchantiopsida3
PlantaeRhodophyta Florideophyceae62
PlantaeRhodophyta Rhodophyceae1
PlantaeTracheophyta Cycadopsida7
PlantaeTracheophyta Ginkgoopsida5
PlantaeTracheophyta Gnetopsida3
PlantaeTracheophyta Liliopsida52
PlantaeTracheophyta Lycopodiopsida9
PlantaeTracheophyta Magnoliopsida473
PlantaeTracheophyta Pinopsida36
PlantaeTracheophyta Polypodiopsida55
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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