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Radiolarian ribbon cherts in the Mesozoic of California, USA.
These rocks are tectonically tilted layers of chert. The dark brick-red color is from hematite (Fe2O3 - iron oxide). Weathering of these chert beds results in a ribbon-like appearance, hence the term ribbon chert. Chert is a siliceous sedimentary rock, composed of cryptocrystalline quartz (SiO2). These particular cherts have abundant microfossils of radiolarians, a group of marine, unicellular, non-photosynthesizing protists that make tiny skeletons of opal (SiO2·nH2O). Burial and diagenesis of radiolarian-rich sediments results in the formation of radiolarian cherts. These rocks are part of the Franciscan Complex (Jurassic) and were deposited on an ancient deep seafloor. The rocks got scraped from the top of a subducting slab of oceanic crust (the Farallon Plate) along coastal California.
The lower-left-to-upper-right fracture in the rocks that offsets the bedding is a fault.
Locality: roadcut in the southern Marin Peninsula, Golden Gate National Recreation Area, north of San Francisco, western coast of California, USA
When she first started working on the Carrizo Plain, UCI scientist Lisa Grant Ludwig marked spots she worked at with wooden stakes. They're vulnerable to the elements, so at those spots Ludwig now marks land with rock piles too.
Dropped Jill off at Specsavers for an eye test..
Not my fault that an Abbeydale Brewery outlet and Primark were just by a Costa coffee shop withing 100 yards of Specsavers!!
Beer and teashirt for under a tenner..! (Costa was an extra treat!)
#Safety notice - Beer and Motorbikes do not go well together!!#
The Wellington faultline runs along the left (east) side of the harbour and up the Hutt Valley (in the distance to the right.
While in Parkfield, California ("Earthquake capitol of the world") I found this monument. There is another half I will upload later. I love a good monument to tectonics!
Like to sprinkle my conversation with geologic terms of which I know little. "Purty" might have been a better title.
"Camera collector and AP columnist Tony Kemplen explains how a second hand camera's faults and shortcomings can lead to a variety of creative possibilities."
Three page article in this week's Amateur Photographer in which I talk about some of the lucky accidents and semi-planned results I've had from some of my old cameras.
As a result of the San Andreas Fault’s motion, slabs of pale granite have been exposed and weathered into fantastic formations at the Devil’s Punchbowl. The paler streaks in the center of this image show the punchbowl against the darker rock of the mountains.
La Ponchera del Diablo
Como resultado del movimiento de la Falla de San Andrés, bloques de granito pálido han sido expuestos y erosionados en las fantásticas formaciones de la Ponchera del Diablo. Las vetas más pálidas en el centro de esta imagen muestran la ponchera contra las rocas más oscuras de las montañas
Author: cocoi_m, flickr
Photoshoot with the band Cascadia Fault Line, 13th of April, while they were recording some songs in the Nordic Church, Liverpool, England.
Like any other fault, strike-slip faults may terminate in zones of ductile deformation. In brittle terminations, the displacement is distributed through several branching splay faults. These small faults, curved away from the strike of the main fault, form an open, imbricate fan called a horsetail splay. This example is located in the Goldfield Nevada strike-slip fault system.
Along the mid-Atlantic ridge many fault lines have opened in the surface of the rock, this one has filled with water to create a deep, crystal clear lake.
Stop 3.6 Moab fault at Bartlet Wash
View is to the east. The footwall to the right is Entrada formation. The hanging wall to the left is Cedar Mountain
Faults cutting Pennsylvanian sedimentary rocks in Utah, USA.
Faults are fractures or fracture systems in rocks along which there has been differential displacement. Faults are produced by either extensional stress, compressional stress, or shear stress. Movement along faults is usually in the form of sudden jolts, which produces earthquakes.
Just south of the southern park boundary of Arches National Park in eastern Utah, USA is the Moab Fault. It extends along Moab Canyon, roughly parallel with Rt. 191. Across the road from the park's visitor center is a nice roadcut (see above photo) with beds of the (apparently) Honaker Trail Formation (Pennsylvanian) that have been chewed up by minor splays of the Moab Fault System.
Locality: roadcut on the southern side of Rt. 191, south of Arches National Park visitor center, Moab Canyon, northwest of the town of Moab, southern Grand County, eastern Utah, USA (38° 36’ 51.40” North latitude, 109° 37’ 15.03” West longitude)
This rock was half-finished when a hidden fault stopped the work.
Often, fractures may be hidden and only open up when shaping a stone. Even with very careful chiselling / hammering one cannot avoid disasters.
This stone was later re-shaped by hand to make a smaller headstone. It's a tricky, sugary red granite that has to be handled with care when shaping.