(Entity["Jurassic Period", Entity["GeologicalPeriod","JurassicPeriod"], "Entity[\"GeologicalPeriod\", \"JurassicPeriod\"]", "geological period"])(Entity["Cryogenian Period", Entity["GeologicalPeriod","CryogenianPeriod"], "Entity[\"GeologicalPeriod\", \"CryogenianPeriod\"]", "geological period"])(Entity["Devonian Period", Entity["GeologicalPeriod","DevonianPeriod"], "Entity[\"GeologicalPeriod\", \"DevonianPeriod\"]", "geological period"])(Entity["Early Ordovician Epoch", Entity["GeologicalPeriod","EarlyOrdovicianEpoch"], "Entity[\"GeologicalPeriod\", \"EarlyOrdovicianEpoch\"]", "geological period"])(Entity["Hadean Eon", Entity["GeologicalPeriod","HadeanEon"], "Entity[\"GeologicalPeriod\", \"HadeanEon\"]", "geological period"])(Entity["Holocene Epoch", Entity["GeologicalPeriod","HoloceneEpoch"], "Entity[\"GeologicalPeriod\", \"HoloceneEpoch\"]", "geological period"])(Entity["Lopingian Epoch", Entity["GeologicalPeriod","LopingianEpoch"], "Entity[\"GeologicalPeriod\", \"LopingianEpoch\"]", "geological period"])(Entity["Paleozoic Era", Entity["GeologicalPeriod","PaleozoicEra"], "Entity[\"GeologicalPeriod\", \"PaleozoicEra\"]", "geological period"])(Entity["Rhyacian Period", Entity["GeologicalPeriod","RhyacianPeriod"], "Entity[\"GeologicalPeriod\", \"RhyacianPeriod\"]", "geological period"])(Entity["Wenlock Epoch", Entity["GeologicalPeriod","WenlockEpoch"], "Entity[\"GeologicalPeriod\", \"WenlockEpoch\"]", "geological period"])…

(EntityClass["eons", EntityClass["GeologicalPeriod","Eons"], "EntityClass[\"GeologicalPeriod\", \"Eons\"]", "geological periods"])(EntityClass["supereons", EntityClass["GeologicalPeriod","Supereons"], "EntityClass[\"GeologicalPeriod\", \"Supereons\"]", "geological periods"])(EntityClass["periods", EntityClass["GeologicalPeriod","Periods"], "EntityClass[\"GeologicalPeriod\", \"Periods\"]", "geological periods"])(EntityClass["epochs", EntityClass["GeologicalPeriod","Epochs"], "EntityClass[\"GeologicalPeriod\", \"Epochs\"]", "geological periods"])(EntityClass["eras", EntityClass["GeologicalPeriod","Eras"], "EntityClass[\"GeologicalPeriod\", \"Eras\"]", "geological periods"])…

(StringTypeLink["GeologicalPeriod", paclet:ref/entity/GeologicalPeriod]) entities include named time divisions that are part of the geologic timescale and used in geochronology.

(StringTypeLink["GeologicalPeriod", paclet:ref/entity/GeologicalPeriod]) entity classes include the various time units used in the geologic timescale, including eons, eras, periods and epochs.

Some properties are available for the (StringTypeLink["GeologicalPeriod", paclet:ref/entity/GeologicalPeriod]) entity type as a whole and can be given using the form (RefLink[EntityValue, paclet:ref/EntityValue])[(StringTypeLink["GeologicalPeriod", paclet:ref/entity/GeologicalPeriod]),property]. Such properties include:

The following annotations can be used in the third argument of (RefLink[EntityValue, paclet:ref/EntityValue])[(StringTypeLink["GeologicalPeriod", paclet:ref/entity/GeologicalPeriod]),property,annotation]:

The following annotations can be used in the second argument of (RefLink[EntityValue, paclet:ref/EntityValue])[property,annotation]:

A qualifier value of (RefLink[Automatic, paclet:ref/Automatic]) indicates that an applicable format of values can be used; e.g. for the "Date" qualifier, this includes a proper date or date span.

OpenersPrimaryExamplesSection(Spacer1)Examples  (6)

OpenersExampleSection0(Spacer1)Basic Examples  (4)

Use (Key1[ctrl, ==]) for entity discovery:

LinguisticAssistant

Find a property value for an entity:

(Entity["Devonian Period", Entity["GeologicalPeriod","DevonianPeriod"], "Entity[\"GeologicalPeriod\", \"DevonianPeriod\"]", "geological period"])["ParentDivision"]

Retrieve a dataset of all available properties for an entity:

(Entity["Holocene Epoch", Entity["GeologicalPeriod","HoloceneEpoch"], "Entity[\"GeologicalPeriod\", \"HoloceneEpoch\"]", "geological period"])["Dataset"]

Find the epochs with the greatest maximum biodiversity:

EntityClass["GeologicalPeriod", {"Type" -> "epoch","MaximumBiodiversity" -> TakeLargest[5]}]//EntityList

OpenersExampleSection2(Spacer1)Neat Examples  (2)

Create a graph showing the connectivity of all geological periods:

assoc=Normal[EntityValue["GeologicalPeriod","Subdivisions","EntityAssociation"]];

TreePlot[Flatten[DeleteMissing[assoc]/.Rule[a_,b_]:>(Rule[a,#]&/@b)]]

Query for the polygons representing the continental plates during the Permian period:

polys=Entity["GeologicalPeriod","PermianPeriod"]["ContinentalPlates"];

Find out which polygon sets are available:

keys=Keys[polys]

Create a map showing the arrangement of continental plates during the Permian period:

GeoGraphics[{GeoStyling["OutlineMap",LightOrange],EdgeForm[Gray],polys[keys[[1]]]},GeoBackground->LightBlue,GeoProjection->"AmericanPolyconic",GeoRange->"World",GeoGridLines->Automatic]

({{DocumentationFooterIconsRelatedFunction.png, ({{See Also}, {Related Entity Types:  (RefLink[GeologicalLayer, paclet:ref/entity/GeologicalLayer])  ▪  (RefLink[Mineral, paclet:ref/entity/Mineral])  ▪  (RefLink[FamousGem, paclet:ref/entity/FamousGem])}, {Related Interpreter Types:  (RefLink[GeologicalPeriod, paclet:ref/interpreter/GeologicalPeriod])  ▪  (RefLink[ComputedGeologicalPeriod, paclet:ref/interpreter/ComputedGeologicalPeriod])}})}})

({{DocumentationFooterIconsRelatedGuide.png, ({{Related Guides}, {▪(RefLinkPlain[Entity Types, paclet:guide/EntityTypes])}})}})

({{(Spacer1), ({{(Spacer1)Related Links}, {(Spacer1)▪(WebLink[(Spacer1)GeologicalPeriod Source Information, http://www.wolfram.com/knowledgebase/source-information/?page=Geochronology])}})}})