Fossils in Ponderosa
The limestone in cave system Ponderosa is richly embedded with fossilised shells. This amazing cave feature can actually make diving the system quite treacherous. The fossil-rich rock is fragile and exhaled gas can bring large amounts of silt, pebbles, fossils and even large rocks down on your head as you're diving. Very fine limestone can turn the water milky and lower visibility to nothing.
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