FIELD TRIP ONE CINDER HILL/ FOSSILFALLS/MORMON ROCKS 3/10/12
MORMON ROCKSBunna Roeum The Mormon Rocks are a series of cemented sandstone beds much more resistant to erosion than the surrounding gravel and silt sands. The Mormon rocks lies right over the fault that divides the Pacific and North American plate and formed the rocks.In 1851, a group of Mormon settlers led by Amasa M. Lyman and Charles C Rich traveled through the Cajon Pass in covered wagon on their way from Salt Lake City to Southern California. A prominent rock formation in the pass, where the Mormon trail and the railway merge.
GRANULAR STRUCTUREBunna Roeum The Granular Structure The Mormon Rocks are made up of underlying sedimentary rocks that have been pushed through the eroded soil from the San Gabriel Mountains.
SAN ANDREAS RIFT ZONE AND STREAM BED The San Andreas Rift zone is aBunna Roeum continental transform fault that runs a length of roughly 810 miles (1,300 km) through California in the United States. The faults motion is right lateral strike slip (horizontal motion). It forms the tectonic boundary between the Pacific plate and the North American plate. The San Andreas rift zone It is located along the dirt /walkway you see in the picture to the left.
CINDER HILL Bunna Roeum Red Hill,or Cinder Hill is a basaltic cinder cone type of Volcano located in the Coso Volcanic field near Fossil Falls State Park
LAVA FLOW Lava flows are streams of molten rock that pour or ooze from an erupting vent. Lava is erupted during either nonexplosive activity or explosive lava fountains. Lava flows destroy everything in their path, but most move slowly enough that people can move out of the way.
FOSSIL FALLSBunna Roeum • During the last ice age the glaciers had fomred in the Sierra Nevade. The meltwater from the glaciers pooled into lakes including Ownes Lake and the Owens River. The river had traveled through to Indian Wells Valley. Fossil falls were formed when the river was forced to divert its course over a basalt flow, polishing and reshaping the rock into a varitety of uniques shapes and forms. All of the lava flows at fossil falls are basaltc.
METATE HOLES• Metate holes were created when pieces of debris would drill into the basalt from the former water flow and would spin and create the metate holes
OBSIDIAN FLAKES • Flakes of obsidian can be foundBunna Roeum in the area, for the Native Americans would camp near Fossil Falls and chip obsidian from the Coso Mountains to form their tools. Remains of rock foundations from their homes and obsidian chips from too lmaking are evidence of various occupations of this site between 12,000 and 3,000 years ago. Obsidian flakes are a result from the Volcanic glass.
PETROGLYPH • The Indians who lived in this fossil falls site were the ones who had carved these animals/petroglyphs pictured on the rock. • Petroglyphs are also known as rock engravings. Petroglyphs are found worldwide and are often associated with prehistoric people. • Petroglyphs are rock carvings left by the indians who came before us and had told stories by engraving them onto the rocks.
HOUSE RINGS • House rings were former homes for the Native Americans. The native Americans would stay here during the summer for cooler climates and during the winter would migrate to the flatter lands during the winter.
TRIP TWO NORTHERN OWENS VALLEYEASTERN SIERRA/LONE PINE/MANZANAR/ DIAZ LAKE/ MONO LAKE/CONVICT LAKE 4/13/2012
DIAZ LAKEBunna Roeum Diaz Lake was created Diaz Lake from and Earthquake along the Lone Pine Fault in 1872. This kind of lake is known as a Sag Pond. The earthquake caused the land to sink and the sunk water filled up the pond creating Diaz lake.
Bunna Roeum Lone pine fault • In 1872 the large earthquake was caused by a vertical and right lateral displacement along the lone pine fault. The earthquake caused the fault to move back and created diaz lake.
ISLANDS AT MONO LAKEBunna Roeum Paoha Island Negit islandPaoha Island located on the left of this slide is a volcanic island that was formed in the 17thcentury. The Negit Island is considered a volcanic cone. Negit island is dark because it wascomposed by lava flows.
TUFA FORMATIONSBunna Roeum tufaWhen calcium rich springs flow up through the lake bottom the calcium bonds tocarbonates in the lake water. Together they form calcium carbonate, a type of limestone.This solid material builds on itself forming a tufa tower. When the Lake level drops theexposed tufa stops growing.