
1) Epoch 2) Growth of mountains 3) Pliocene epoch
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https://www.crosswordclues.com/clue/pliocene

1) Epoch
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https://www.crosswordclues.com/clue/pliocene

• (n.) The Pliocene period or deposits. • (a.) Of, pertaining to, or characterizing, the most recent division of the Tertiary age.
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http://thinkexist.com/dictionary/meaning/pliocene/

(pronounced PLEE-oh-seen) The Pliocene was an epoch in geologic time that lasted from 5-1.8 million years ago (it was at the end of the Tertiary period). During this epoch, the first hominids (australopithecines) andmodern forms of whales appeared. The ancient shark megalodon swam the seas during this time.
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http://www.enchantedlearning.com/subjects/dinosaurs/glossary/
Pli'o·cene adjective [ Written also
pleiocene .] [ Greek ... more + ... new, recent.]
(Geol.) Of, pertaining to, or characterizing, the most recent division of the Tertiary age.
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http://www.encyclo.co.uk/webster/P/108
Pli'o·cene noun (Geol.) The Pliocene period or deposits.
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http://www.encyclo.co.uk/webster/P/108

The Pliocene was the sixteenth geological period, 8,000,000 years ago. It marked the modern formation of the continents.
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http://www.probertencyclopaedia.com/browse/HP.HTM

[
n] - from 2 million to 13 million years ago
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http://www.webdictionary.co.uk/definition.php?query=Pliocene

Pliocene Of or belonging to the geologic time, rock series, or sedimentary deposits of the last epoch of the Tertiary Period, characterized by the appearance of distinctly modern animals. From thirteen million to two million years ago; there was a growth of mountains; a cooling of the climate; and more and larger mammals. During this time the glob...
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http://www.wordinfo.info/words/index/info/view_unit/407/

a period of time approximately 10 to 2 million years ago
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https://sciencetrek.org/sciencetrek/topics/dinosaurs/glossary.cfm
Pliocene epoch noun from 13 million to 2 million years ago; growth of mountains; cooling of climate; more and larger mammals
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https://www.encyclo.co.uk/local/20974

Final epoch of the Tertiary period, spanning the time between 5.3 and 1.8 million years ago. It is named after the Greek words 'pleion' (more) and 'ceno' (new).
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https://www.encyclo.co.uk/local/21202

A geological period 7-2 mya.
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https://www.encyclo.co.uk/local/22658
No exact match found.