Bird Spring Formation -Upper Mississippian to lower Permian

GSSP Mississippian-Pennsylvanian boundary

Battleship Wash FM, Upper Mississippian

Visean Yellowpine Fm, (Mississippian)

Visean Yellowpine Fm, Monte Cristo Group

fault zone

fault zone, calcite

Visean Yellowpine Fm, Monte Cristo Group

Mississippian Yellowpine Fm, Monte Cristo Gr

Siliceous nodule

Fossilized reef rocks

bryozoans

Modern shelf bryozoans

crinoids

Crinoids

Carboniferous marine life

Fossil spiral

Time''s Spiral, Arrow Canyon

Native Americans Pictogram, Arrow Canyon

Native Americans Pictogram, Arrow Canyon

Pleistocene sediments in Clark County, NV

Fluvial Pleistocene sediments in Clark County, NV

Pleistocene deposits in Clark County

River deposits in Arrow Canyon

Myotis californicus

Creosote bush

Arrow Canion Range

Stromatolites

The different thicknesses of the sediments in the fore-deep basin; the thickest part is in the west, adjacent to the front of the fold and thrust belt. In the south - the paleo-Gulf of Mexico.

The eastern limit of the arc-related plutons. They trace across the entire western edge of the plate margin, suggesting that Andean-style subduction was active throughout most of the Mesozoic. An over-riding theme in this story of the Arc environment is HEAT. This is the driving factor for most of the structures that we observe. In the subduction zone, the isotherms are depressed where cold rocks of the subducting plate go down but to the east they are juxtaposed against the hot intrusive Arc environment. Moving further in-board from the arc, the rocks progressively cool to within the fold and thrust belt, finally returning to normal temperatures in the undeformed basement. This heat in the arc provides a possible mechanism for consuming the foot-wall of the antithetic fold and thrust belt, but it is hard to locate where this might be happening.