But the piracy had not ended. Note in figure 34_B_ that the “new” river sent out several tributaries, one of which headed for and, with the aid of yet additional and greater uplift, soon captured the ancestral Gunnison River, as shown in figure 34_C_. This second act of piracy left Unaweep Canyon really “high and dry” except for small streams that carried off what little water the canyon received from local rain and snow. While these piracies were taking place, the Book Cliffs and the edge of Grand Mesa gradually retreated away from the valley because of erosion, and more of the Uncompahgre arch was uncovered. The rising Uncompahgre arch, whose renewed uplifts in latest Pliocene or earliest Pleistocene times played such an important role in the ultimate abandonment of ancestral Unaweep Canyon, was asymmetric in that the crest was not in the middle but was near the southwest side. Although sharp, locally faulted monoclines are found on both sides of the arch, including the part within the Monument, in general, the northeastern flank has a rather gentle northeastward dip; whereas, the southwestern flank of the arch also is bordered by normal faults of considerable vertical displacement.[31] Thus, after abandonment, the minor drainage in Unaweep Canyon continued to flow northeastward from a new divide near the southwestern border, and ancestral West Creek began cutting northeastward toward the new divide. The drainage pattern depicted in figure 34_C_ differs slightly from my earlier interpretation and results from additional fieldwork.[32] [Illustration: PROBABLE DRAINAGE PATTERNS AND LAND FORMS NEAR THE MONUMENT AT FOUR SUCCESSIVE STAGES OF DEVELOPMENT. Solid drainage lines taken from the Moab and Grand Junction, Utah-Colorado, topographic maps of the Army Map Service; dashed drainage lines are my own ideas. _A_, just prior to piracy of ancestral Colorado River; _B_, after piracy of ancestral Colorado River and just prior to piracy of ancestral Gunnison River; _C_, abandonment of Unaweep Canyon after renewed uplift of Uncompahgre arch and piracy of ancestral Gunnison River; and _D_, present drainage pattern after additional uplift and piracy of East Creek. Modified from Lohman (1961, 1965a, 1965b). (Fig. 34)] [Illustration: A, just prior to piracy of ancestral Colorado River] [Illustration: B, after piracy of ancestral Colorado River and just prior to piracy of ancestral Gunnison River] [Illustration: C, abandonment of Unaweep Canyon after renewed uplift of Uncompahgre arch and piracy of ancestral Gunnison River] [Illustration: D, present drainage pattern after additional uplift and piracy of East Creek.]