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The Pinnacles

The Pinnacles
Photo Information
Copyright: Lori Cannon (LCannon) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 374 W: 137 N: 804] (3107)
Genre: Landscapes
Medium: Color
Date Taken: 2007-08-07
Categories: Mountain
Camera: Kodak Easyshare LS753
Exposure: f/6.7, 1/750 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2007-08-21 17:12
Viewed: 3596
Points: 6
[Note Guidelines] Photographer's Note
This is a photo of The Pinnacles in Crater Lake National Park. This information is from the sign describing the history of these formations.

The history of the "pinnacles" below began
about 7,700 years ago when the eruptions of
Mt. Mazama were reaching their climax. Torrents
of red-hot, gas-charged pumice poured down
Mazama's slopes at speeds of up to 100 mph
(160kph). On top of this came a flow of heavier
rocks called scoria. These glowing avalanches
flooded downslope for many miles, leaving
deep deposits in their wake.

Temperatures in the deposits may have exceeded
750 F (400 C). Plumes of vapors appeared, as
gasses escaped from the settling rocks through
vents called fumaroles. Minerals in the gasses,
combined with extreme heat, welded the sides of
the fumaroles in the shape of slender cones. Since
then, streams have eroded a canyon through the
deposits, exposing the cones. Many of these fossil
fumaroles are hollow.

The glowing avalanche deposits took years to cool. Hot gasses escaped through fumaroles whose shapes are preserved in the pinnacles.

Glowing avalnches from Mt. Mazama
filled surrounding valleys with deposits
of pumice and scoria. Today, streams
are cutting new valleys.

Juyona, XOTAELE has marked this note useful
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Critiques [Translate]

  • Great 
  • Juyona Gold Star Critiquer/Silver Workshop Editor [C: 2232 W: 10 N: 2971] (16891)
  • [2007-08-22 4:49]

Hola Lori,
Bello paisaje, hermosos colores, espectacular lugar. Buen trabajo!

  • Great 
  • Isu Gold Star Critiquer/Silver Note Writer [C: 313 W: 0 N: 21] (1663)
  • [2007-08-22 4:52]

Buenos días Lori,
Precioso paisaje, y buenos detalles, un gran trabajo! Bello espectáculo.

Hola Lori.
Un paisaje perfectamenta captado.
Buenos detalles e iluminación.
Un saludo, JL.

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