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O!'J!!13 -3- "rocks. being oanparatively soft. post glacial ero- sive influences have rsmoved the traces to a great extent. " This ridge gradually marges into a. long narrow mesa. known as Tongue Mesa. which forms the lower end of the divide between the Uncompahgre and the C:l.marron. Its average elevation is 9.500 feet. North of Tongue tlesa is the low point on the CiJDarron-Uncompah- gre divide. This saddle is oalled Carro Summit and is orossed by hath highViB.y and railroad running to Gunnison. The Summit is 20 miles ea.st of Montrose and han an elevation of 7.910 feet. Running northwest from Cerra S=it is a oomparatively flat top- ped ridge whioh forms the eastern side of the va.l1ey. and the west rim of the Black Canyon of the Gunnison. It has an elevation of 8.500 feet in the vioinity of Cerra Summit and slopes northward down to 5.500 feet near the JUI1Dtion of' the Gunnison Rivsr and the North Fork of the Gunnison. The west side of this ridge. fa.oing into the Valley. is joined by badly eroded a.dobe hills whioh break rather abruptly into the valley floor. The foothill region in the Ouray-Colona seotion ranges in ele- vation from 7.700 feet at Ouray and 6.770 feet at Ridgway to a high point of 10.338 feet at Horsefly Peak. 10 miles northYIest of Ridgway. In the main valley from Colona to Delta the average elevation is 5.500 feet. At the southern end of the area the elevation is 6.450 feet, While the low point is 4.974 feet in the town of Delta. The fol- lowing table gives the eleva.tions of the towns. river, and average of the valley in the vicinity of the tOV"lI TABIE I EIEVATIONS IN UNCctlPAIlGRE VAUEY COLONA TO DELTA River Elevation (Feet above Sea Avge. Valley Elevation Location Town Elevation Level) 1. COlona 2. Montrose 3. Olathe 4. Delta 5. Mouth of Ri vsr 6450 5820 5346 4974 6400 5800 5340 Le70 4910 6450 5900 5!po 5150