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The Touchet Formation or Touchet beds consist of large quantities of gravel and fine sediment which overlay almost a thousand meters (several thousand feet) of volcanic basalt of the Columbia River Basalt Group in south-central Washington and north-central Oregon. The beds consist of between 6 and 40 distinct rhythmites – horizontal layers of sediment, each clearly demarcated from the layer below. These Touchet beds are often covered by windblown loess soils which were deposited later; the number of layers varies with location. The beds vary in depth from 330 ft (100 m) at lower elevations where a number of layers can be found to a few extremely thin layers at the maximum elevation where they are observed (1,150 ft (350 m)).

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  • Formació Touchet (ca)
  • Formazione del Touchet (it)
  • Formation de Touchet (fr)
  • Touchet Formation (en)
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  • La formation de Touchet (en anglais : Touchet Formation), d'après la census-designated place de Touchet, sont des strates constituées de graviers et fins sédiments datant de la fin du Pléistocène supérieur, qui recouvrent du basalte volcanique dans la zone du groupe basaltique du Columbia, dans les États américains de Washington et de l'Oregon. (fr)
  • The Touchet Formation or Touchet beds consist of large quantities of gravel and fine sediment which overlay almost a thousand meters (several thousand feet) of volcanic basalt of the Columbia River Basalt Group in south-central Washington and north-central Oregon. The beds consist of between 6 and 40 distinct rhythmites – horizontal layers of sediment, each clearly demarcated from the layer below. These Touchet beds are often covered by windblown loess soils which were deposited later; the number of layers varies with location. The beds vary in depth from 330 ft (100 m) at lower elevations where a number of layers can be found to a few extremely thin layers at the maximum elevation where they are observed (1,150 ft (350 m)). (en)
  • Le formazioni del Touchet o letti del Touchet, che prendono il nome dal fiume Touchet, sono particolari formazioni geologiche che consistono in grandi quantità di ghiaia e fini sedimenti che si sovrappongono a quasi mille metri (pari a molte migliaia di piedi) di basalto vulcanico del gruppo basaltico del Columbia nella parte centro-meridionale dello south-central Stato di Washington e nella parte centro-settentrionale dell'Oregon. I letti consistono in un numero compreso tra 6 e 40 distinte – strati orizzontali di sedimento, ciascuno chiaramente demarcato dallo strato sottostante. Questi letti del Touchet sono spesso coperti da terreno di löss spinto dal vento depositatosi successivamente; il numero di strati varia in base alla posizione. La profondità dei letti varia da 100 m (330 piedi (it)
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  • Touchet Formation (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Lake_Lewis_Basin.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Lake_Lewis_flood_profiles.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Touchet-formation-2.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Touchet-formation-St-Helens-ash.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Touchet-formation-alng-tcht-rvr.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Touchet-formation-clastic-flows-tcht-rvr.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Touchet-formation.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Zillah-rhythmites.jpg
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