Mount Morrison Roof Pendant

Type section locality area and or origin of name.

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. 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. 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. This fold is bounded on the east and west by faults.

It lies midway between mono lake on the north and bishop california on the south. Rocks of the mount morrison roof pendant. Mount morrison consists of a roof pendant that underlies an area of 62 km 2 24 sq mi. The tight folds range in amplitude from a few inches to several tens of feet.

Morrison s summit pendant a lower paleozoic roof pendant usgs professional paper 1145 is composed of dolomite and marble basically metamorphosed limestone. The age is pre cambrian making it some of the oldest rock in the sierra. These rocks developed along the passive western continental margin of north america during the middle devonian. 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.

Most minor folds in this roof pendant however are steeply plunging and related to apparent lateral movement along faults. These rocks developed along the passive western continental margin of north america during the middle devonian.