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No, it has never erupted. It is an isolated upthrust peak due to geologic compression.

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12y ago
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5mo ago

No, Mt. Diablo in Contra Costa County has not experienced any volcanic eruptions. It is a dormant volcano that has not shown any volcanic activity for millions of years. Its last known eruption was over 190 million years ago during the Jurassic period.

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12y ago

No, it is an upthrust peak caused by geologic compression.

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Q: Did Mt Diablo in Contra costa county ever erupted?
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