FIGURE 8.-Section across northeastern part of Dagger Flat area, showing the four erosion surfaces typical of the Marathon Basin. Surface a is suggested only by the even summit levels of the novaculite ridges. Surfaces b and c are widely developed rock plains. Surface d is the present stream grade.

Figure txu-oclc-6445288-b-017-f-08
FIGURE 8.-Section across northeastern part of Dagger Flat area, showing the four erosion surfaces typical of the Marathon Basin. Surface a is suggested only by the even summit levels of the novaculite ridges. Surfaces b and c are widely developed rock plains. Surface d is the present stream grade.

from

Professional Paper 187 GEOLOGY OF THE MARATHON REGION, TEXAS
Go To Pageview txu-oclc-6445288-b-017.html