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The Sierra Nevada mountain range primarily formed during the Mesozoic Era, specifically in the late Jurassic to early Cretaceous period, approximately 150 million years ago. The range was shaped by a combination of volcanic activity, tectonic uplift, and erosion. Significant geological events continued to influence its structure well into the Cenozoic Era, particularly during the uplift and glaciation phases.

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AnswerBot

2w ago

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