Vasquez rocks: geology, crime, movies.
These impressive strata are largely coarse (gravels and pebble) sandy conglomerates and breccias deposited due to active faults driving rapid uplift and erosion of the San Gabriel Mountains. 25 million years ago during the Oligocene the Pacific-North American collision zone uplifted the area and erosion coupled with volcabism drove rapid deposistion of alluvial fans into a subsiding rift valley. These alluvial sediments were lithified during the Miocene and reexposed in the Cenozoic due to fault activity along the San Andreas fault. Now exhibiting a high degree of tilt exaccerbated by the hogback ridges these rocks are tedtament to the dynamic tectonics of the SW USA.
The formations name of Vasquez rocks is attributed to one of California's most notorious bandits in 1873-74; Tiburcio Vásquez. This bandit hid from the law in these craggy rocks.
More recently the location has been used in almost countless film and television projects. Most notably in an episode of Star Trek where Captain Kirk fights the Alien Gorn.
En #geology#geologia es usada para medir el espesor real de estratos geológicos, cuando estos son grandes, permitiendo obtener buena precisión de las dimensiones de capas inclinadas, proyectando visuales con el mismo grado de inclinación que esta (gracias al clinómetro) esta visual corresponde a un plano cuya altura es de 1,5 metros, en definitiva la suma de todas las proyecciones visuales nos permitirá calcular el espesor real #geologystudent#sedimentology#estratigrafia
Speleothems of Mawjymbuin Cave, Shillong , India
Speleothems sometimes referred to as formations or decorations, are cave features formed by the deposition of minerals. The word speleothem is derived from the Greek words spelaion meaning "cave" and thema meaning "deposit". The speleothems with which most people are familiar are stalactites and stalagmites. Stalactites grow down from the cave ceiling, while stalagmites grow up from the cave floor. It’s easy to remember which is which: Stalactites have a "T" for top and stalagmites have a "G" for ground.
A mini alluvial fan or fluvial distributary system developed during falling tide where a freshwater stream meets a beach in Cornwall, UK. The apex is an incised channel which is eroding into the beach. Downstream the fan becomes unconfined with increasing sinuosity and then terminal unconfined lobes. The water here infiltrates into the sand as he flow spread out and the rate of infiltration exceeds the flow discharge. #alluvialfan#sand#fluvial#sedimentology
Happy New Year from Doctor Ripple! Here's some relaxing swash on a beach in Cornwall, uk. Fast shallow currents caused by breaking waves rush up and down (backwash) the foreshore. As these flows are fast and shallow, they are in the upper flow regime and a plane bed forms. #sedimentology#sedimentarystructures#beachprocesses#beaches#planebed
Coarse-grained layers of cretaceous saxon sandstone in fine-grained sandstone. The bigger the particles/grains in a sediments are, the greater the transport energy must have been, in order to transport these particles. This fact leads to the conclusion that the "normal" flow regime must have been relatively low, which led to the sedimentation of fine grains, mainly composed of quartz. However there must have been events, where the energy of the flow regime must have been increased, so that coarse particles could be transported. This can be triggered by different causes: One of them could be a regression of the sea, another could be that for a brief period of time a river ran through the area, that lead to an increase in the flow regime. I do not know the reason but I was able to track the horizon several hundred meters. This leads me to the thesis, that the sea level must have been lowered and raised for at least two times.
Grobsandsteinhorizonte in Feinsandstein in der Sächsischen Schweiz. Je gröber die Partikel, desto größer muss die Transportenergie gewesen sein. Möglicherweise handelt es sich hierbei um eine Regression des Meeresspiegels.
What would you do if you come here??? Understand Puente del Inca Formation, mountain building or swim on thermal waters?
_"El Puente del Inca" was formed as an ice bridge, probably during the last maximum glacial; the ice was covered by avalanches debris from the adjacent slope; then during thawing the bridge was supported by the mud matrix of the conglomerates, which subsequently were cemented by the minerals of the hot-thermal springs. In 1965 an avalanche of mud covered the tourist hotel you can see in the picture, leaving this incredible landscape_ #puentedelinca#geology#sedimentology#hidrothermalactivity#andesmountains#mendoza#argentina