Observed arrival · 2026-09-09
Fossils of Southern Arizona: When Tucson Was an Ocean
A Tucson geologist’s field guide to marine fossils, local collecting spots, legal limits, and museums around southern Arizona.
Field notes
The guide links fossil identification to specific landscapes around Tucson, moving from ancient marine deposits to present-day outcrops and rubble. It describes crinoid stem fragments as resembling stone Cheerios and compares destinations by travel time, geological age, and collection status. Colossal Cave is presented as a view-only stop, while the Whetstone Mountains are described as national-forest fossil-hunting country where casual collecting is generally allowed. The page is attributed to Tucson geologist Joel Bennett.
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