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Oligocene

Hierarchy:Phanerozoic Cenozoic  Paleogene
   Oligocene
Classification:Epoch (as per International Commission on Stratigraphy)
Top:23.03 Ma
Base:33.9 Ma
Preceeds:Neogene Miocene  Aquitanian
Follows:Eocene Priabonian
Primary Divisions:ChattianRupelian
Name origin:The name Oligocene comes from the Ancient Greek ὀλίγος (oligos, "few") and καινός (kainos, "new"), and refers to the sparsity of extant forms of molluscs.
Fossil Record

Data via PaleoBioDB


Taxa Count Key
First appearance
Extinction
First appearance and extinction
Related precursors
KingdomPhylumClassTaxa Count
AnimaliaAnnelida Clitellata4
AnimaliaAnnelida Polychaeta43
AnimaliaArthropoda Arachnida431
AnimaliaArthropoda Branchiopoda11
AnimaliaArthropoda Cephalocarida1
AnimaliaArthropoda Chilopoda18
AnimaliaArthropoda Diplopoda30
AnimaliaArthropoda Entognatha3
AnimaliaArthropoda Insecta4,274
AnimaliaArthropoda Malacostraca801
AnimaliaArthropoda Maxillopoda64
AnimaliaArthropoda Merostomata1
AnimaliaArthropoda Ostracoda248
AnimaliaArthropoda Pauropoda3
AnimaliaArthropoda Pycnogonida1
AnimaliaArthropoda Remipedia1
AnimaliaArthropoda Symphyla6
AnimaliaBrachiopoda Craniata8
AnimaliaBrachiopoda Lingulata13
AnimaliaBrachiopoda Rhynchonellata171
AnimaliaBrachiopoda Strophomenata7
AnimaliaBryozoa Gymnolaemata600
AnimaliaBryozoa Phylactolaemata1
AnimaliaBryozoa Stenolaemata84
AnimaliaChordata Actinopterygii208
AnimaliaChordata Amphibia23
AnimaliaChordata Ascidiacea1
AnimaliaChordata Aves278
AnimaliaChordata Cephalaspidomorphi1
AnimaliaChordata Elasmobranchii182
AnimaliaChordata Holocephali3
AnimaliaChordata Mammalia4,175
AnimaliaChordata Myxini1
AnimaliaChordata Reptilia575
AnimaliaChordata Sarcopterygii5
AnimaliaCnidaria Anthozoa750
AnimaliaCnidaria Cubozoa1
AnimaliaCnidaria Hydrozoa21
AnimaliaCnidaria Scyphozoa2
AnimaliaEchinodermata Asteroidea59
AnimaliaEchinodermata Crinoidea38
AnimaliaEchinodermata Echinoidea381
AnimaliaEchinodermata Holothuroidea55
AnimaliaEchinodermata Ophiuroidea47
AnimaliaHemichordata Enteropneusta4
AnimaliaHemichordata Pterobranchia2
AnimaliaMollusca Bivalvia1,466
AnimaliaMollusca Cephalopoda36
AnimaliaMollusca Gastropoda2,459
AnimaliaMollusca Monoplacophora1
AnimaliaMollusca Polyplacophora26
AnimaliaMollusca Scaphopoda44
AnimaliaNematoda Adenophorea3
AnimaliaNematoda Secernentea2
AnimaliaPlatyhelminthes Trematoda1
AnimaliaPorifera Calcarea5
AnimaliaPorifera Demospongiae19
AnimaliaPorifera Hexactinellida48
AnimaliaPorifera Homoscleromorpha1
AnimaliaTardigrada Eutardigrada5
AnimaliaTardigrada Heterotardigrada1
BacteriaCyanobacteria Cyanophyceae2
ChromistaForaminifera Globothalamea346
ChromistaForaminifera Monothalamea31
ChromistaForaminifera Tubothalamea67
ChromistaHaptophyta Prymnesiophyceae39
ChromistaMyzozoa Dinophyceae32
ChromistaOchrophyta Bacillariophyceae82
ChromistaOchrophyta Chrysophyceae1
ChromistaOchrophyta Dictyochophyceae8
ChromistaOchrophyta Phaeophyceae2
ChromistaRadiozoa Polycystina181
FungiAscomycota Eurotiomycetes1
FungiAscomycota Sordariomycetes2
FungiBasidiomycota Agaricomycetes4
PlantaeAnthocerotophyta Anthocerotopsida1
PlantaeBryophyta Bryopsida4
PlantaeBryophyta Sphagnopsida2
PlantaeCharophyta Charophyceae8
PlantaeCharophyta Zygnematophyceae3
PlantaeChlorophyta Chlorophyceae6
PlantaeChlorophyta Trebouxiophyceae2
PlantaeChlorophyta Ulvophyceae14
PlantaeMarchantiophyta Jungermanniopsida1
PlantaeMarchantiophyta Marchantiopsida4
PlantaeRhodophyta Florideophyceae74
PlantaeRhodophyta Rhodophyceae1
PlantaeTracheophyta Cycadopsida17
PlantaeTracheophyta Ginkgoopsida6
PlantaeTracheophyta Gnetopsida7
PlantaeTracheophyta Liliopsida83
PlantaeTracheophyta Lycopodiopsida21
PlantaeTracheophyta Magnoliopsida661
PlantaeTracheophyta Pinopsida134
PlantaeTracheophyta Polypodiopsida79
ProtozoaAmoebozoa Lobosa1
Warm but cooling climate, moving towards Icehouse; Rapid evolution and diversification of fauna, especially mammals.

Major evolution and dispersal of modern types of flowering plants, a global expansion of grasslands, and a regression of tropical broad leaf forests to the equatorial belt.
 

Geologic Events

Event NameTypeAgeArea
Andean orogeny (ongoing)OrogenyMaximum Age: 200 MaSouth America


Overview of geological time

List all geological events
 
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