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A geologist finds siltstone in a canyon. What does this mean?

User Naor
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If siltstone is found in a canyon, it could mean that the area can be once a sea, delta or a shore. Siltstone is a sedimentary rock that is formed through compression and suspension from substance deposits. The canyon can be a part of the sea that has dried and formed in a million years.
User Bvanderveen
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