Shell impressions and remnants in sandstone boulder in rock slide debris in Serrano Canyon. Probably

alt="Shell impressions and remnants in sandstone boulder in rock slide debris in Serrano Canyon. Probably from the early Miocene (16-24 million years ago) like those on the Fossil Trail." border="0">

Shell impressions and remnants in sandstone boulder in rock slide debris in Serrano Canyon. Probably from the early Miocene (16-24 million years ago) like those on the Fossil Trail.

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