Smithsonian miscellaneous collections . ?? Tucumcan f . y^ n^,,^^/ San Jon ^^ ^/ - f^:!smmi/ym)\ NO\y\- ? ^eiSTACADO San Jon Site ^? \ -y^: SOUTHERN H)j6H PLAINS \. V 1 (.LLANO ESTACADO) X :::iL Fig. 3.—Physiographic map of a portion of eastern New Mexico. These converge to form a single drainage, Sand Canyon Arroyo, whichflows northeast through a deep narrow canyon. This canyon piercesthe escarpment and the arroyo descends to the Valley Plains of theCanadian and hence via the San Juan Arroyo to the Canadian dissected portion of the depression is almost completely con-tai
Smithsonian miscellaneous collections . ?? Tucumcan f . y^ n^,,^^/ San Jon ^^ ^/ - f^:!smmi/ym)\ NO\y\- ? ^eiSTACADO San Jon Site ^? \ -y^: SOUTHERN H)j6H PLAINS \. V 1 (.LLANO ESTACADO) X :::iL Fig. 3.—Physiographic map of a portion of eastern New Mexico. These converge to form a single drainage, Sand Canyon Arroyo, whichflows northeast through a deep narrow canyon. This canyon piercesthe escarpment and the arroyo descends to the Valley Plains of theCanadian and hence via the San Juan Arroyo to the Canadian dissected portion of the depression is almost completely con-tained within an area one-half mile in diameter. Considered in abroad way this depression is one of several depressions lying in agroove in the High Plains as discussed below. 12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 121 ORIGIN OF THE SAN JON DEPRESSION The dissected depression which contains the San Jon site is oneof several depressions lying in a broad, shallow groove in the HighPlains as shown in figure 5. Figure 5 shows also that there areother grooves in the Plains to the south and that these also containdepressions of varying si
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