Great unconformity, Grand Canyon, Arizona transgression, transgressive sequence, nonconformity https://geologypics.com/wp-content/uploads/2017/07/geology-pics.png 0 0 Marli Miller https://geologypics.com/wp-content/uploads/2017/07/geology-pics.png Marli Miller2017-04-30 20:29:542019-02-19 00:50:29Great unconformity, Grand Canyon, Arizona
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