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Landmark landform / geomorphic summary of an area

Landmark landform / geomorphic summary of an area Still the reigning best graphical models for a a region. ( adapted from Peterson, 1981 ; Fig. 1 ). F - basin floor (LS) (= bolson floor) P - piedmont slope (LS). ( adapted from Peterson, 1981 ; Fig. 2 ).

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Landmark landform / geomorphic summary of an area

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  1. Landmark landform / geomorphic summary of an area • Still the reigning best graphical models for a a region.

  2. ( adapted from Peterson, 1981; Fig. 1 )

  3. F- basin floor(LS) (= bolson floor) P- piedmont slope(LS) ( adapted from Peterson, 1981; Fig. 2 )

  4. Basic Landform elements of Basin & Range terrain – southwestern US Landscape : bolson, semi-bolson A - alluvial fan B - ballenas F - alluvial flat M - mountains (LS) P- fan piedmeont (LS) S - fan skirt Y - playa ( adapted from Peterson, 1981; Fig. 3 )

  5. Generalized landscape model for bolsons in US Basin & Range.

  6. Drainageway Types . 1 - interfan - valley drainageway 2 - fanhead trench 3 - onfan drainageway 4 - interfan-valley drainageway ( with on-fan tributaries ) A - alluvial fan V - interfan valley P - fan piedmont ( adapted from Peterson, 1981; Fig. 7 )

  7. F - fan remnant - eroded fan remnant sideslope I - inset fan ( adapted from Peterson, 1981; Fig. 4 )

  8. B - ballena I - inset fan P - fan piedmont (LS) ( adapted from Peterson, 1981; Fig. 6 )

  9. Schoeneberger LS: badlands LF: ballenas, ballonsBadlands, SD

  10. Common, Progressive Sequence of : dissection, alluviation, redissection, realluviation Time: a - ( relict surface remnants with young eroded sideslopes ) b - pediment ( footslope ) c - inset fan d- (inset-fan remnants) e - younger inset-fan surface ( adapted from Peterson, 1981; Fig. 8 )

  11. A - fan apron BF - basin floor P - fan piedmont ( adapted from Peterson, 1981; Fig. 10 )

  12. Landscape Evolution : Typical Erosion Sequences of Fan Piedmonts 1 - original fan surface 2 - first gullying sequence ( or its remnants of pediments, footslopes ) 3 - second gullying sequence ( or its remnants of pediments, footslopes ) 4 - third gullying sequence ( or its remnants of pediments, footslopes ) Generalized (Erosional) Evolution of Divides a – relict fan-piedmont surface (1) b - asymmetric, relict fan piedmont surface and new, encroaching pediments c - ridgeline remnants of pediments 2 & 3 d - late stage erosion of “c” ( adapted from Peterson, 1981; Fig 11 )

  13. BF - basin floor I - inset fan P - (dissected) fan piedmont S - fan skirt ( adapted from Peterson, 1981; Fig. 12 )

  14. Landscape : semi-bolson B - ballenas F - (axial stream) flood plain I - inset fans M - mountains (LS) P - fan piedmont ( and eroded fan remnants ) S - fan skirts T - (axial) stream terrace ( adapted from Peterson, 1981; Fig. 13 )

  15. Hillslope Evolution : backwearing side slopes and pedimentation stream Time: 0 S = stable summit a = base level P = pediment ( = erosional surface ) ps = pedisediment ( adapted from Peterson, 1981; Fig. 16 )

  16. Hillslope Evolution & Hillslope - Profile Positions: summit (divide) lowering begins - 2 dimensional - backwearing slope convergence - divide lowering ( adapted from Peterson, 1981; Fig. 15 )

  17. Variations of hillslope-profile positions in southwestern US Landscapes C S N B S I N c = crest m = summit b = backslope f = footslope t = toeslope x = drainageway ( adapted from Peterson, 1981; Fig. 17 ) I= interfluve C = crest S = side slope H = head slope N = nose slope B = base slope 2 dimensional hillslope-profile positions vs. 3 dimensional geomorphic components

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