Touchet Formation (original) (raw)
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.
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| dbo:abstract | 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)). The Touchet beds are one element in a chain of evidence which helped identify and define the progression of the Missoula Floods, which occurred around 16,450 to 13,750 years BCE. During the floods, flow through the Wallula Gap was slow enough such that water pooled in a temporary lake, Lake Lewis. Lake Lewis back-flooded up the Yakima, Walla Walla, Touchet and Tucannon River Valleys. In these relatively calm arms of the lake, the slack waters deposited the suspended materials eroded from the scabland regions north of Lake Lewis, and redeposited them in pronounced layers before receding. (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) alle quote più basse dove è possibile trovare un certo numero di strati, a quella corrispondente a pochi strati estremamente sottili che possono eesere osservati alla massima quota (350 m (1150 piedi)). I letti del Touchet sono un elemento in una catena di prove che ha contribuito a identificare e definire la progressione delle inondazioni di Missoula, che si verificarono tra il 16.450 a.C. e il 13.750 a.C.. Durante le inondazioni, il flusso attraverso il Wallula Gap fu abbastanza lento da far sì che l'acqua si accumulasse in un lago temporaneo, il lago Lewis. Il lago Lewis invase le valli dei fiumi Yakima, Walla Walla, Touchet e Tucannon. In queste braccia relativamente calme del lago, le acque lente hanno depositato i materiali sospesi erosi dalle regioni corrispondenti alle Channeled Scablands a Nord del lago Lewis e li hanno ridepositati in evidenti strati prima di retrocedere. (it) |
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| dbo:wikiPageWikiLink | dbr:Quincy,_Washington dbr:Sanpoil_River dbr:Basalt dbr:Boardman,_Oregon dbr:Alluvial_plain dbc:Pleistocene_United_States dbr:Infill dbr:Varve dbr:Common_Era dbr:Saddle_Mountains dbr:Geological_formation dbr:Glacial_Lake_Columbia dbr:Missoula_Floods dbr:Mabton,_Washington dbr:Snake_River dbr:Columbia_Plateau dbr:Columbia_River_Basalt_Group dbr:Zillah,_Washington dbr:Ice_rafting dbr:Glacial_erratics dbr:British_Columbia dbr:Cecil,_Oregon dbr:Touchet,_Washington dbr:Touchet_River dbr:Tucannon_River dbr:Walla_Walla_River dbr:Wallula_Gap dbr:Washington_(U.S._state) dbr:Willamette_Valley dbr:Drainage_basin dbr:Columbia_River_Drainage_Basin dbr:Jökulhlaup dbr:Loess dbr:Tephra dbr:Eastern_Washington dbr:North_America dbr:Paleomagnetism dbc:Geologic_formations_of_Washington_(state) dbr:Graded_bedding dbr:Gravel dbr:J_Harlen_Bretz dbr:Bonneville_Flood dbc:Fluvial_deposits dbc:Rancholabrean dbr:Aeolian_processes dbr:Lake_Allison dbr:Lake_Condon dbr:Lake_Lewis dbr:Latah_Creek dbr:Eddy_(fluid_dynamics) dbr:Trinidad,_Washington dbr:Richard_Foster_Flint dbc:Geologic_formations_of_Oregon dbr:Pleistocene dbr:Portland,_Oregon dbr:Clastic_dike dbr:Oregon dbc:Glacial_deposits dbr:Catastrophism dbr:Radiocarbon_dating dbr:Yakima,_Washington dbr:Yakima_River dbr:Type_locality_(geology) dbr:Channeled_scablands dbr:Rhythmite dbr:Clast dbr:Outcrop dbr:Sediment dbr:Rancholabrean dbr:Uniformitarianism_(science) dbr:File:Lake_Lewis_flood_profiles.jpg dbr:File:Touchet-formation-St-Helens-ash.JPG dbr:File:Touchet-formation-alng-tcht-rvr.JPG dbr:File:Touchet-formation-clastic-flows-tcht-rvr.JPG dbr:File:Touchet-formation.JPG dbr:File:Zillah-rhythmites.JPG dbr:Pataha_Creek |
| dbp:age | dbr:Pleistocene ~ (en) |
| dbp:caption | Touchet beds in Burlingame Canyon near Lowden in the Walla Walla valley. Note distinct layers. (en) |
| dbp:coordinates | White Bluffs (en) Touchet Basin (en) Walla Walla Basin (en) Yakima Basin (en) |
| dbp:extent | Western North America (en) Columbia Basin of (en) |
| dbp:mapCaption | Map showing the elevations of the Mid-Columbia region. The lowland areas in brown routinely were flooded during the Missoula Floods, creating lakes. (en) |
| dbp:name | Touchet Formation (en) |
| dbp:namedby | dbr:Richard_Foster_Flint |
| dbp:namedfor | dbr:Touchet,_Washington |
| dbp:otherlithology | dbr:Basalt dbr:Loess |
| dbp:overlies | dbr:Columbia_River_Basalt_Group |
| dbp:period | Tarantian (en) |
| dbp:prilithology | Sediment (en) |
| dbp:region | dbr:Washington_(U.S._state) dbr:Oregon |
| dbp:thickness | up to (en) |
| dbp:type | dbr:Geological_formation |
| dbp:underlies | dbr:Loess |
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| dbp:yearTs | 1938 (xsd:integer) |
| dcterms:subject | dbc:Pleistocene_United_States dbc:Geologic_formations_of_Washington_(state) dbc:Fluvial_deposits dbc:Rancholabrean dbc:Geologic_formations_of_Oregon dbc:Glacial_deposits |
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| rdf:type | geo:SpatialThing yago:Abstraction100002137 yago:Arrangement107938773 yago:Formation108426461 yago:Group100031264 yago:WikicatGeologicFormationsOfTheUnitedStates |
| rdfs:comment | 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) |
| rdfs:label | Formació Touchet (ca) Formazione del Touchet (it) Formation de Touchet (fr) Touchet Formation (en) |
| owl:sameAs | freebase:Touchet Formation yago-res:Touchet Formation wikidata:Touchet Formation dbpedia-ca:Touchet Formation dbpedia-fr:Touchet Formation dbpedia-it:Touchet Formation https://global.dbpedia.org/id/4uz9w |
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| geo:long | -120.516670 (xsd:float) |
| prov:wasDerivedFrom | wikipedia-en:Touchet_Formation?oldid=1124115015&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/Lake_Lewis_Basin.jpg wiki-commons:Special:FilePath/Lake_Lewis_flood_profiles.jpg wiki-commons:Special:FilePath/Touchet-formation-2.jpg wiki-commons:Special:FilePath/Touchet-formation-St-Helens-ash.jpg wiki-commons:Special:FilePath/Touchet-formation-alng-tcht-rvr.jpg wiki-commons:Special:FilePath/Touchet-formation-clastic-flows-tcht-rvr.jpg wiki-commons:Special:FilePath/Touchet-formation.jpg wiki-commons:Special:FilePath/Zillah-rhythmites.jpg |
| foaf:isPrimaryTopicOf | wikipedia-en:Touchet_Formation |
| is dbo:wikiPageDisambiguates of | dbr:Touchet |
| is dbo:wikiPageRedirects of | dbr:Touchet_bed dbr:Touchet_beds |
| is dbo:wikiPageWikiLink of | dbr:Touchet_bed dbr:Touchet_beds dbr:Missoula_floods dbr:Sedimentary_rock dbr:Ice_Age_Floods_National_Geologic_Trail dbr:Touchet,_Washington dbr:Touchet_River dbr:Lake_Condon dbr:Touchet dbr:Clastic_dike dbr:Rhythmite |
| is foaf:primaryTopic of | wikipedia-en:Touchet_Formation |
