Officer's cave, a pseudokarst feature in altered tuff and volcanic ash of the John Day formation in eastern Oregon
Officer 's Cave is the uppermost of four rapidly eroding cave levels constituting a cavern complex about 700 feet long developed chiefly in clay and silt. Its outer room is 35 feet by 43.5 feet by 100 feet and slopes about 45° east into the western end of a narrow linear hill called Officer 's Cave Ridge. Dry valleys, blind valleys, hanging valleys, sinkholes, pipes, caves, and natural bridges are abundant. These, together with subterranean drainage, give the area a karstlike development. For such terrains the term " pseudokarst " is applied. These pseudokarsts are the product of piping and are fairly widespread over the world's drylands.
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