FIGURE 6.-Block diagrams of three anticlinal mountains in the Marathon Basin, arranged in sequence to show forms displayed during the course of their erosion. Op, Fort Peña formation (resistant); Ow, Woods Hollow shale (nonresistant); Omv, Maravillas chert; and Dc, Caballos novaculite (resistant); Ct, Tesnus formation (nonresistant). A, Horse Mountain, which is covered by novaculite; B, East Bourland Mountain, where the novaculite cover is removed and where there is a small axial anticlinal valley cut in the Woods Hollow shale; C, mountain between Woods Hollow and Little Woods Hollow, with an extensive axial anticlinal valley and a low axial ridge on the Fort Peña formation in the center.

Figure txu-oclc-6445288-b-014-f-06
FIGURE 6.-Block diagrams of three anticlinal mountains in the Marathon Basin, arranged in sequence to show forms displayed during the course of their erosion. Op, Fort Peña formation (resistant); Ow, Woods Hollow shale (nonresistant); Omv, Maravillas chert; and Dc, Caballos novaculite (resistant); Ct, Tesnus formation (nonresistant). A, Horse Mountain, which is covered by novaculite; B, East Bourland Mountain, where the novaculite cover is removed and where there is a small axial anticlinal valley cut in the Woods Hollow shale; C, mountain between Woods Hollow and Little Woods Hollow, with an extensive axial anticlinal valley and a low axial ridge on the Fort Peña formation in the center.

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Professional Paper 187 GEOLOGY OF THE MARATHON REGION, TEXAS
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