A new and fundamentally different regional geomorphology paradigm in which massive south- and southeast-oriented meltwater floods flowed across the entire Missouri River drainage basin is tested by interpreting detail...A new and fundamentally different regional geomorphology paradigm in which massive south- and southeast-oriented meltwater floods flowed across the entire Missouri River drainage basin is tested by interpreting detailed topographic maps of the Montana upper Sun River drainage basin region by trying to explain origins of previously unexplained or poorly explained erosional landforms located upstream from Sun River Canyon (which cuts across Montana’s north-to-south oriented Sawtooth Range). Mountain passes, through valleys, and other drainage divide low points along what are today high mountain ridges, including the North American east-west continental divide, are interpreted to be evidence of drainage routes that once crossed the region. These drainage divide crossings suggest that prior to erosion of present-day upper Sun River drainage basin valleys, massive floods moved in south directions across what are today the north-oriented Middle and South Fork Flathead River drainage basins into today’s upper Sun River drainage basin area and carved a complex of diverging and converging channels into what was probably a low relief surface now represented by the crests of the region’s highest mountain ridges. Further, the map evidence shows how a diverging complex of south- and southeast-oriented upstream Sun River drainage basin flood flow channels changed flow direction to cross the Sawtooth Range in a northeast direction before converging on the Montana plains at a location downstream from Sun River Canyon. The observed upper Sun River drainage basin area topographic map evidence is consistent with the new geomorphology paradigm predictions, in which massive south-oriented meltwater floods flowing across the rising rim of a continental ice sheet created deep “hole” (created by deep ice sheet erosion and ice sheet weight caused crustal warping) are diverted to flow in northeast and north directions into and across deep “hole” space being opened up by ice sheet melting.展开更多
报道了产于云南西部贡山县高黎贡山西坡的巴坡、撕拉洛等地海拔1 380～1 500 m独龙江河畔的空竹属一新种——毒空竹(Cephalostachyum virulentum Y.M.Yang et Fan Du sp.nov.)。新种与空竹(C.fuchsianum Gam-ble)近似,合轴丛生,秆直立,...报道了产于云南西部贡山县高黎贡山西坡的巴坡、撕拉洛等地海拔1 380～1 500 m独龙江河畔的空竹属一新种——毒空竹(Cephalostachyum virulentum Y.M.Yang et Fan Du sp.nov.)。新种与空竹(C.fuchsianum Gam-ble)近似,合轴丛生,秆直立,秆极光亮,无主枝,小枝具叶7～9片;叶片卵状披针形,长20～25 cm,宽4～4.5 cm,叶背面无毛;叶柄长仅5 mm,叶鞘口紫色,无繸毛,明显区别于其他种类。展开更多
文摘A new and fundamentally different regional geomorphology paradigm in which massive south- and southeast-oriented meltwater floods flowed across the entire Missouri River drainage basin is tested by interpreting detailed topographic maps of the Montana upper Sun River drainage basin region by trying to explain origins of previously unexplained or poorly explained erosional landforms located upstream from Sun River Canyon (which cuts across Montana’s north-to-south oriented Sawtooth Range). Mountain passes, through valleys, and other drainage divide low points along what are today high mountain ridges, including the North American east-west continental divide, are interpreted to be evidence of drainage routes that once crossed the region. These drainage divide crossings suggest that prior to erosion of present-day upper Sun River drainage basin valleys, massive floods moved in south directions across what are today the north-oriented Middle and South Fork Flathead River drainage basins into today’s upper Sun River drainage basin area and carved a complex of diverging and converging channels into what was probably a low relief surface now represented by the crests of the region’s highest mountain ridges. Further, the map evidence shows how a diverging complex of south- and southeast-oriented upstream Sun River drainage basin flood flow channels changed flow direction to cross the Sawtooth Range in a northeast direction before converging on the Montana plains at a location downstream from Sun River Canyon. The observed upper Sun River drainage basin area topographic map evidence is consistent with the new geomorphology paradigm predictions, in which massive south-oriented meltwater floods flowing across the rising rim of a continental ice sheet created deep “hole” (created by deep ice sheet erosion and ice sheet weight caused crustal warping) are diverted to flow in northeast and north directions into and across deep “hole” space being opened up by ice sheet melting.
文摘报道了产于云南西部贡山县高黎贡山西坡的巴坡、撕拉洛等地海拔1 380～1 500 m独龙江河畔的空竹属一新种——毒空竹(Cephalostachyum virulentum Y.M.Yang et Fan Du sp.nov.)。新种与空竹(C.fuchsianum Gam-ble)近似,合轴丛生,秆直立,秆极光亮,无主枝,小枝具叶7～9片;叶片卵状披针形,长20～25 cm,宽4～4.5 cm,叶背面无毛;叶柄长仅5 mm,叶鞘口紫色,无繸毛,明显区别于其他种类。
