Mount Morrison Roof Pendant

Mount morrison consists of a roof pendant that underlies an area of 62 km 2 24 sq mi.

Mount morrison roof pendant. The metamorphic rock composing the mount morrison roof pendant block is the relict of a paleozoic sedimentary sequence overprinted by several deformation events which left the rocks isolated atop the sierra nevada batholith. In the mount morrison pendant structures produced during the morrison orogeny apparently were later refolded twice prior to sinistral displacement on the laurel convict fault which cross cuts. These rocks developed along the passive western continental margin of north america during the middle devonian. The tight folds range in amplitude from a few inches to several tens of feet.

This fold is bounded on the east and west by faults. Most minor folds in this roof pendant however are steeply plunging and related to apparent lateral movement along faults. Type area is along john muir trail between mount morrison roof pendant and wheeler crest and pine creek septa on east and potter pass septum on west sierra nevada ca bateman 1992. Rocks of the mount morrison roof pendant.

Type section locality area and or origin of name. The age is pre cambrian making it some of the oldest rock in the sierra. A classic well documented example of a roof pendant is the strata that comprise mount morrison within the sierra nevada in mono and fresno counties california. Metasedimentary rocks of the mount morrison roof pendant just south of long valley caldera gave 87 sr 86 sr values that range from 0 7090 to 0 7250 goff et al 1991.

Morrison s summit pendant a lower paleozoic roof pendant usgs professional paper 1145 is composed of dolomite and marble basically metamorphosed limestone. Numerous metavolcanic rocks from the ritter range pendant gave 87 sr 86 sr values that range from 0 7053 to 0 7264 most of them 0 709 kistler and swanson 1981.