The Ataspaca prospect is in the Cordillera Occidental, 45 km northwest of Tacna, Peru. Epizonal intrusions satellitic to the Caplina- Ataspaca pluton were emplaced 41 m.y. ago into limestones of the Lower Jurassic Pelado Formation along the northeast-trending Chucchuco fault system. Depths of emplacement ranged from 4.5 to 6.0 km....
During the Late Mississippian-Early Pennsylvanian (latest
Chesterian-early Morrowan), a thick sequence of shallow -water
carbonate-clastic sediments, equivalent to the "Amsden" and lower
Quadrant Formations, was deposited in the Snowcrest trough on the
western margin of the northern Rocky Mountain Cordilleran platform
in southwestern Montana. Today this late Chesterian sequence is...
The Devonian Simonson and Guilmette Formations provide examples of
Cordilleran miogeosynclinal inner and middle shelf carbonate deposition
that act in response to changes in eustasy, sedimentation, and
tectonics. The Simonson Dolomite consists of four members that
collectively record three distinct transgressive-regressive cycles.
The Coarse Crystalline dolomudstone lithofacies represents restricted
upper...
The Nanga Parbat-Haramosh massif (NPHM) is a north-south trending
structural and topographic high, which interrupts the east-west trend
of the Himalaya in northern Pakistan. Previously, the massif was
thought to be bounded by the Main Mantle thrust (MMT), a north-dipping
thrust along which the Kohistan-Ladakh arc was thrust south over...
Early Paleozoic limestones and dolomites of the shallow shelf
transitional facies belt were mapped in the southern Sulphur Spring
Range, Eureka County, Nevada. The four youngest units in the map area
are in fault contact with the Lower Devonian rocks and were probably
transported westward, along a low-angle normal fault....
The Seaman Gulch area is located approximately 20
miles east of Redding, California and is part of the
eastern Klamath lithotectonic belt.
Rock units of the area are chiefly mafic and silicic
volcanics of island arc affinity and shale that are Permian
to Triassic in age. Volcanic rocks of Tertiary...
The Nanga Parbat-Haramosh massif (NPHM) is a unique structural
and topographic high in the northwestern corner of the Himalayan
convergence zone. Previously, the NPHM was thought to be bounded by
the MMT, a thrust along which the Kohistan-Ladakh island arc was
obducted onto the northern margin of fridia. This study...
In the southern Fish Creek Range, Nye County Nevada,
Devonian rocks are found overlying younger rocks. These
Devonian units are allochthonous blocks that slid by
gravity into their present positions.
The allochthonous blocks represent several different
provenances commonly found to the west and northwest of the
area. The blocks include...