While the fossil fragments in the fine-grained limestones from the summit of Mount Everest (brought back by Swiss in 1956 and Americans in 1963) are not sufficiently well-preserved to allow an age determination, they are probably crinoid rather than echinoid, and they support rather than contradict the Carboniferous to lower Permian age generally assigned to the Everest limestone. Supposed fossils found in 1924 at about 25,500 feet on the Tibetan face of Everest turned out to be an unusual example of cone-in-cone structure.

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