FIGURE 5.-Block diagrams of the escarpments on the west side of the Marathon Basin. The upper diagrams (A and C) show the form of the restored structural, surface, and the lower diagrams (B and D) show diagrammatically the present surface form. A and B are in the Del Norte Mountains. Here erosion has carved out the weak beds on the upthrown side of the fault so that the resistant beds on the downthrown side stand up in an escarpment (an obsequent fault-line scarp). Compare sections M-M' and N-N', plate 21. C and D are in the Santiago Mountains. Here the resistant beds on the west have been raised to their present position by a normal fault. Erosion of the raised beds in places makes an escarpment near the fault line (as toward back of block), but in others has cut back into steeply folded beds to the west (as toward front of block). Compare sections Q-Q'-Q , R-R', and S-S', plate 21.

Figure txu-oclc-6445288-b-012-f-05
FIGURE 5.-Block diagrams of the escarpments on the west side of the Marathon Basin. The upper diagrams (A and C) show the form of the restored structural, surface, and the lower diagrams (B and D) show diagrammatically the present surface form. A and B are in the Del Norte Mountains. Here erosion has carved out the weak beds on the upthrown side of the fault so that the resistant beds on the downthrown side stand up in an escarpment (an obsequent fault-line scarp). Compare sections M-M' and N-N', plate 21. C and D are in the Santiago Mountains. Here the resistant beds on the west have been raised to their present position by a normal fault. Erosion of the raised beds in places makes an escarpment near the fault line (as toward back of block), but in others has cut back into steeply folded beds to the west (as toward front of block). Compare sections Q-Q'-Q", R-R', and S-S', plate 21.

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Professional Paper 187 GEOLOGY OF THE MARATHON REGION, TEXAS
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