Hoodoos - Don't Seem Possible!
My shots are a pale version that don't capture the grandeur at all!!! Can't wait to go back with a good camera. We each assumed the other had packed the camera bag in the trunk...
Hoodoos of rhyolite in Chiricahua National Monument, southeastern Arizona.
Rhyolite is an igneous, volcanic (extrusive) rock, of felsic (silica-rich) composition (typically > 69% SiO2 — see the TAS classification). It may have any texture from glassy to aphanitic to porphyritic. The mineral assemblage is usually quartz, alkali feldspar and plagioclase (in a ratio > 1:2 — see the QAPF diagram). Biotite and hornblende are common accessory minerals.
Rocks from the Bishop tuff, uncompressed with pumice on left; compressed with fiamme on right.
Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcrops of rhyolite may bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas. They can also occur as breccias or in volcanic plugs and dikes. Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian. Slower cooling forms microscopic crystals in the lava and results in textures such as flow foliations, spherulitic, nodular, and lithophysal structures. Some rhyolite is highly vesicular pumice. Many eruptions of rhyolite are highly explosive and the deposits may consist of fallout tephra/tuff or of ignimbrites.
During the second millennium BC, rhyolite was quarried extensively in what is now eastern Pennsylvania in the United States. Among the leading quarries was the Carbaugh Run Rhyolite Quarry Site in Adams County, where as many as fifty small quarry pits are known.[1]
The name rhyolite has been introduced into science by the German traveler and geologist Ferdinand von Richthofen after his explorations in the Rocky Mountains in the 1860s.
en.wikipedia.org/wiki/Rhyolite
•A hoodoo (also tent rock, fairy chimney, earth pyramid) is a tall thin spire of rock that protrudes from the bottom of an arid drainage basin or badland. ...
en.wikipedia.org/wiki/Hoodoos
•hoodoo - (geology) a column of weathered and unusually shaped rock; "a tall sandstone hoodoo"
wordnetweb.princeton.edu/perl/webwn
•hoodoo - Geologists sometimes hunt hoodoos. A hoodoo is an erosional form which develops fantastic pinnacles, towers and grotesque shapes. The hard head of hoodoos hold up the formation. This hoodoo on the left is in the Chiricahua mountains. Of course, Bryce Canyon, Utah, is hoodoo heaven.
tucsoncitizen.com/wryheat/2009/12/28/some-geologic-terms-for-scrabble-players/
•hoodoo - Hoodoos are tall columns of oddly-shaped rock produced by differential weathering. They are typically composed of sedimentary rock and the eccentric shapes and variable thicknesses of the spires are caused by the different erosional rates and patterns of alternating hard and softer rock layers. ...
www.nps.gov/archive/yell/insideyellowstone/glossary.htm
•hoodoo - A column or pillar of bizarre shape caused by differential erosion on rocks of different hardness.
www.desertusa.com/glossary2.html
hoodoo - Eccentric-looking pillars of eroded rock, found in regions where sporadic, heavy rainfall is typical. Hoodoos form when hard rock (such as a boulder) protects a column of more erodable sediment beneath it. ...
IMG_6192
Hoodoos - Don't Seem Possible!
My shots are a pale version that don't capture the grandeur at all!!! Can't wait to go back with a good camera. We each assumed the other had packed the camera bag in the trunk...
Hoodoos of rhyolite in Chiricahua National Monument, southeastern Arizona.
Rhyolite is an igneous, volcanic (extrusive) rock, of felsic (silica-rich) composition (typically > 69% SiO2 — see the TAS classification). It may have any texture from glassy to aphanitic to porphyritic. The mineral assemblage is usually quartz, alkali feldspar and plagioclase (in a ratio > 1:2 — see the QAPF diagram). Biotite and hornblende are common accessory minerals.
Rocks from the Bishop tuff, uncompressed with pumice on left; compressed with fiamme on right.
Rhyolite can be considered as the extrusive equivalent to the plutonic granite rock, and consequently, outcrops of rhyolite may bear a resemblance to granite. Due to their high content of silica and low iron and magnesium contents, rhyolite melts are highly polymerized and form highly viscous lavas. They can also occur as breccias or in volcanic plugs and dikes. Rhyolites that cool too quickly to grow crystals form a natural glass or vitrophyre, also called obsidian. Slower cooling forms microscopic crystals in the lava and results in textures such as flow foliations, spherulitic, nodular, and lithophysal structures. Some rhyolite is highly vesicular pumice. Many eruptions of rhyolite are highly explosive and the deposits may consist of fallout tephra/tuff or of ignimbrites.
During the second millennium BC, rhyolite was quarried extensively in what is now eastern Pennsylvania in the United States. Among the leading quarries was the Carbaugh Run Rhyolite Quarry Site in Adams County, where as many as fifty small quarry pits are known.[1]
The name rhyolite has been introduced into science by the German traveler and geologist Ferdinand von Richthofen after his explorations in the Rocky Mountains in the 1860s.
en.wikipedia.org/wiki/Rhyolite
•A hoodoo (also tent rock, fairy chimney, earth pyramid) is a tall thin spire of rock that protrudes from the bottom of an arid drainage basin or badland. ...
en.wikipedia.org/wiki/Hoodoos
•hoodoo - (geology) a column of weathered and unusually shaped rock; "a tall sandstone hoodoo"
wordnetweb.princeton.edu/perl/webwn
•hoodoo - Geologists sometimes hunt hoodoos. A hoodoo is an erosional form which develops fantastic pinnacles, towers and grotesque shapes. The hard head of hoodoos hold up the formation. This hoodoo on the left is in the Chiricahua mountains. Of course, Bryce Canyon, Utah, is hoodoo heaven.
tucsoncitizen.com/wryheat/2009/12/28/some-geologic-terms-for-scrabble-players/
•hoodoo - Hoodoos are tall columns of oddly-shaped rock produced by differential weathering. They are typically composed of sedimentary rock and the eccentric shapes and variable thicknesses of the spires are caused by the different erosional rates and patterns of alternating hard and softer rock layers. ...
www.nps.gov/archive/yell/insideyellowstone/glossary.htm
•hoodoo - A column or pillar of bizarre shape caused by differential erosion on rocks of different hardness.
www.desertusa.com/glossary2.html
hoodoo - Eccentric-looking pillars of eroded rock, found in regions where sporadic, heavy rainfall is typical. Hoodoos form when hard rock (such as a boulder) protects a column of more erodable sediment beneath it. ...
IMG_6192