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Era

Geological Era

Subdivision of geological time; shorter than an eon and longer than a period.

Wikipedia | Era (Geology)

Statements about Era

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Brockhaus and Efron Encyclopedic Dictionary

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Small Brockhaus and Efron Encyclopedic Dictionary

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Armenian Soviet Encyclopedia, Vol. 3

:311

Great Soviet Encyclopedia (1926–1947)

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Small Soviet Encyclopedia

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Geochronological Unit

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External Pages About Era

KBpedia

WordNet 3.1 Synset

Encyclopædia Britannica Online

Encyclopedia of China (Third Edition)

Google Knowledge Graph

Dewey Decimal Classification