GeologicalPeriod

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Named time divisions used in the geologic timescale.

Entity["GeologicalPeriod",name] or

represents an entity of type "GeologicalPeriod".

[prop]

gives the value of a specified property.

[{propi,}]

gives the value of a list of properties.

[Dated[prop,date]]

gives the value of a property associated with a particular date specification.

EntityClass["GeologicalPeriod",{propispeci,}]

represents a class of entities with values of propi defined by speci.

Sample Entities

Sample Entity Classes

Properties

  • AssociatedRockLayerassociated rock layer
    BiologicalEventsbiological events
    ContinentalPlatescontinental plates
    DinosaurFamiliesdinosaur families
    Durationduration
    EndingEventending event
    GeologicalEventsgeological events
    LastPeriodprevious period
    MaximumBiodiversitymaximum biodiversity
    MaximumOxygenLevelsmaximum atmospheric oxygen
    MaximumSeaLevelmaximum change in sea level
    MeanBiodiversitymean biodiversity
    MeanOxygenLevelsmean atmospheric oxygen
    MeanSeaLevelmean change in sea level
    MeteorCratersmeteor craters
    MinimumBiodiversityminimum biodiversity
    MinimumOxygenLevelsminimum atmospheric oxygen
    MinimumSeaLevelminimum change in sea level
    Namename
    NextPeriodnext period
    ParentDivisionparent division
    ParentEonparent eon
    ParentEraparent era
    ParentPeriodparent period
    StartingEventstarting event
    Subdivisionssubdivisions
    TimeRangetime range
    Typedivision type

Details

  • "GeologicalPeriod" entities include named time divisions that are part of the geologic timescale and used in geochronology.
  • "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 "GeologicalPeriod" entity type as a whole and can be given using the form EntityValue["GeologicalPeriod",property]. Such properties include:
  • "Properties"the list of available properties
    "PropertyCanonicalNames"the standard names of available properties
    "SampleEntities"a sample list of available entities (typically of length 10)
    "SampleEntityClasses"a sample list of available entity classes (typically of length 10)
    "EntityCount"number of entities available
    "Entities"the list of available entities
    "EntityCanonicalNames"the standard names of available entities
    "EntityClasses"the list of available entity classes
    "EntityClassCanonicalNames"the standard names of available entity classes
    "PropertyClasses"the list of available property classes
    "PropertyClassCanonicalNames"the standard names of available property classes
    "PropertyCount"number of properties available
  • The following annotations can be used in the third argument of EntityValue["GeologicalPeriod",property,annotation]:
  • "Source"source information for the property
    "Date"the date associated with the entity-property value (if any)
    "EntityAssociation"an association of entities and entity-property values
    "PropertyAssociation"an association of properties and entity-property values
    "EntityPropertyAssociation"an association in which the specified entities are keys, and values are a nested association of properties and entity-property values
    "PropertyEntityAssociation"an association in which the specified properties are keys, and values are a nested association of entities and entity-property values
    "Dataset"a dataset in which the specified entities are keys, and values are an association of property names and entity-property values
  • The following annotations can be used in the second argument of EntityValue[property,annotation]:
  • "Qualifiers"the list of possible qualifiers for the property
    "QualifierValues"the list of possible values that can be given to each qualifier
    "DefaultQualifierValues"the list of default values for the property's qualifiers
    "Description"a brief textual description of the property
    "Definition"a detailed textual definition of the property
    "PhysicalQuantity"the physical quantity associated with the entity-property value
    "Unit"the unit associated with the entity-property value
  • A qualifier value of 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.

Examples

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Basic Examples  (4)

Use for entity discovery:

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Find a property value for an entity:

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Retrieve a dataset of all available properties for an entity:

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Find the epochs with the greatest maximum biodiversity:

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Neat Examples  (2)