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When did the major mountain-building phases of the Apennine orogeny occur?
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Apennine Range
The Apennines mountain range.
The Apennine orogeny developed through several tectonic phases primarily during the Cenozoic Era, which began approximately 65 million years ago. The mountain-building process reached its climax during the Miocene and Pliocene epochs, spanning from about 23 million to 2.6 million years ago.1