The Qomolangma Formation, also known as the Jolmo Lungama Formation or the Everest Formation,
[47] runs from the summit to the top of the Yellow Band, about 8,600 m (28,200 ft) above sea level. It consists of greyish to dark grey or white, parallel laminated and bedded,
Ordovician limestone inter layered with subordinate beds of recrystallised
dolomite with
argillaceouslaminae and
siltstone. Gansser first reported finding microscopic fragments of
crinoids in this limestone.
[48][49] Later
petrographicanalysis of samples of the limestone from near the summit revealed them to be composed of carbonate pellets and finely fragmented remains of
trilobites, crinoids, and
ostracods.