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It was an andesite and dacite stratovolcano with its eruptive activity much less explosive than modern Pinatubo.
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was and andesite
Mount Mazama, part of the Cascade Range volcanic arc, was built up mostly of andesite, dacite, and rhyodacite over a period of at least 400, 000 years.
He knew Pemex had drilled exploratory wells in the region in 1951, one bored into what was described as a thick layer of andesite about 1. 3 km ( 4, 200 ft ) down.
In 2009, researchers revealed that andesite was found in two meteorites ( numbered GRA 06128 and GRA 06129 ) that were discovered in the Graves Nunatak Icefield during the US Antarctic Search for Meteorites 2006 / 2007 field season.
Much of this structure was subsequently buried under about of basaltic andesite lava flows that are called the Main Cone Lavas.
The cone was built from basaltic andesite, a common component of other shield volcanoes in the Oregon Cascades, breccia, and tuff, and is intruded by dikes.
The lava that erupted was shattered when it came in contact with the ice and the cone interior is therefore made of easily eroded andesite fragments.
In 1928 a pyroxene and andesite mine was opened.
A second cone-building stage was characterized by large andesite lava flows that poured out of a summit crater and in time buried the cinder cone.
The caldera may have formed by collapse after a large volume of andesite was erupted from vents along the caldera rim.
After the cone was eroded, a series of hypersthene andesite lava flows were erupted between 0. 17 and 0. 21 million years ago.
The lithic industry was the most individual feature of this aceramic culture and innumerable stone vessels made of grey andesite have been discovered during excavations.
It was active beginning about 150, 000 years ago and consists of andesite and dacite.
This gulley was formed by the erosion of a fault, resulting from the juxtaposition of soft pyroclastic rocks on one side against harder andesite and basalt on the other.
was and dacite
The word dacite comes from Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains ( now modern Romania ) where the rock was first described.
The magma was encountered at a depth of 2488 m and was repeatedly drilled as it surged up the drillhole and quenched over a range of 8 m. The dacite magma is a residual melt of the typical basalt magma of Kīlauea.
Later, a mass of rhyolite was forced through the north flank of Sifford Mountain and a plug of dacite was pushed up through the west flank of Raker Peak.
Another lahar, of unidentified age, was rich in oxyhornblende dacite ; and continued for into the Sauk River.
The dacite magma was more oxidized than most magmas, and the sulfur-rich nature of the eruption was probably causally related to the redox state.
It is a highly eroded stratovolcano composed of dacite and rhyodacite lava that was deposited during three phases of volcanic activity.
After the Mount Cayley proper was constructed, lava flows, tephra and welded dacite rubble were erupted.
After the flood took place, a small dacite lava flow was erupted that later solidified to form a series of well-preserved columnar joints.
The mid west has purple and green-grey dacite of the Walker Volcanics that was deposited before the rhyodacite.
North of center is purple and green-grey dacite of the Walker Volcanics that was deposited before the rhyodacite.
North of center is purple and green-grey dacite of the Walker Volcanics that was deposited before the
was and stratovolcano
Over time, an ancestral Mount Shasta stratovolcano was built to a large but unknown height ; sometime between 300, 000 and 360, 000 years ago the entire north side of the volcano collapsed, creating an enormous landslide or debris avalanche, in volume.
In an initial phase, called the " Paléo-Pelée " stage, Mount Pelee was a common stratovolcano.
Mount Bachelor was formed between 11, 000 and 15, 000 years ago as a shield volcano but was later capped with a stratovolcano as the eruptions apparently became more explosive over time.
It was created on the destroyed northeastern flank of now gone Mount Tehama, a stratovolcano that was at least higher than Lassen Peak.
The Tahoma typeface family was named after the Native American name for the stratovolcano Mount Rainier ( Mount Tahoma ) which is a prominent feature of the southern landscape around the Seattle metropolitan area.
The 1980 eruption of Mount St. Helens, a stratovolcano located in Washington, in the United States, was a major volcanic eruption.
After this stratovolcano was constructed, volcanism moved to the west where a series of andesite-dacite lava flows and pyroclastic flows were extruded during a period of Peléan activity 300, 000 years ago.
It was named after the stratovolcano Mount Garibaldi, which in turn was named after the Italian military and political leader Giuseppe Garibaldi in 1860.
Originally, Uhlířský vrch was a stratovolcano ( compositive volcano ) formed by both explosive and effusive eruptions, thus it is composed of pyroclastic rocks.
February 1600: When construction was almost finished, the violent eruption of the Huaynaputina stratovolcano ( also known as Quinistaquillas or Omate ), together with several earthquakes and a rain of ash, destroyed part of the structure.
An older stratovolcano was partially destroyed by edifice collapse, producing a debris-avalanche deposit along the south flank.
The Armero tragedy () was one of the major consequences of the eruption of the Nevado del Ruiz stratovolcano in Tolima, Colombia on November 13, 1985.
A second stratovolcano was constructed almost entirely of lava flows within Caldera One and attained a height of about 900 m. A cataclysmic eruption, possibly in early post-glacial time, resulted in the formation of a second, smaller caldera ( Caldera Two ) that partially destroyed this cone.
Field relations suggest that the northern boundary of Caldera Two is a hinge along which a large block, comprising most of the Caldera One stratovolcano, was tilted southward during the caldera eruption.
All the historical and recent eruptions ( 1787 and after ) are confined within and around an active polygenetic cinder cone in a wide caldera that was formed by the Pleistocene collapse of a primitive cone of a stratovolcano.
was and with
Gavin's stallion was in the barn and he tightened the cinches over the saddle blanket, working by touch in the darkness, comforting the animal with easy words.
Cabot turned back to the men and he was drunk with the thing they would do, wild to break from the cloying warmth of the saloon into the cold of the ebbing night.
Gavin's face was bloodless with excitement.
Still, I was disgusted with myself for agreeing with Montero's methods.
His mouth was open, his neck corded with the strain of his screams.
Out in front of our walls the grass was covered with dead and dying men, war shields, lances, blankets and wounded and dead horses.
The morning air was filled with the sweetish odor of new-spilled blood, the acrid stench of frightened horses, and the bitterness of burned powder.
Above me a dark rider was whipping his pony with a quirt in an attempt to hurdle the bales.
He was shaking with anger, his breath coming in long, painful gasps.
The town was about what Wilson expected: one main street with its rows of false-fronted buildings, a water tower, a few warehouses, a single hotel ; ;
It was, I felt, possible that they were men who, having received no tickets for that day, had remained in the hall, to sleep perhaps, in the corners farthest removed from the counter with its overhead light.
He was a man in his late forties, with graying hair, of medium height ; ;
It was partially cemented by ages and pressure, yet it crumpled before the onslaught of the powerful streams, the force of a thousand fire hoses, and with the gold it held washed down through the long sluices.
The man was tall, thin, with a narrow face and a too-large nose.
The ground was covered with soft pine needles and the slope was gentle.
Was it not possible, after all, that the forest was in league with her and her child that its sympathy lay with the Culvers that she had erred in failing to understand this??
She regarded them as signs that she was nearing the glen she sought, and she was glad to at last be doing something positive in her unenunciated, undefined struggle with the mountain and its darkling inhabitants.
Having persisted too long in deliberate ignorance and denial of the forces that threatened her, Pamela was relieved now to admit their potency and to be taking definite steps toward grappling with them.
Unconcerned, indifferent, unmotivated, the forest was simply there -- fighting man's depredations with more abundant growth and man's follies with its own musical evening laughter.
He was handsome, with his coal-black hair and eyes, his fine-chiseled features.
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