GeologicalPeriodData
GeologicalPeriodData[entity, property] gives the value of the specified property for the geological period entity.
GeologicalPeriodData[{entity1, entity2, …}, property]gives a list of property values for the specified period name entities.GeologicalPeriodData[entity, property, annotation]gives the specified annotation associated with the given property.
Examples
GeologicalPeriodData["Jurassic", "StartDate"]GeologicalPeriodData["Cretaceous", "Duration"]Please visit the official Wolfram Language Reference for more details.