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<br /> <br />O;)Lj8~ <br /> <br />Soil parent materials are sandstone. shale. gravelly and cobbly <br />outwash. and alluvium. Typically the map units are composed of <br />both deep and shallow soils and include significant acreages of <br />rock outcrop. <br /> <br />There are eight map units in this grouP. but three have small <br />acreages that individually only constitute 0.5 percent of the <br />basin. Extensive Great Groups are: Argiborolls. Haploborol1s. <br />Cryoboralfs. and Eutroboralfs. <br /> <br />- <br />~- <br />~ <br /> <br />...., <br />I. -=:, <br />l '- -,- l <br /> <br />~~ ,,-""--. ~ . .r~ ' <br />Z' . ,i' ""~ .fJtlo>.., ,~~; ~;t . <br />::o::"~ ........- _ ~ ... ~ . . .'#fi; <br />l.al~ '- -, <br />"'-- -~,"~~to:-1t~.. <br />~. 'J._~"". ' <br />-...._~- . .... -. .-r~ _ , ~ .. . . ~ <br />:~ - I -.,.~'.ia'7i~.~ " ........, -, <br />-~- ~ ~,,-~- ~-., <br />- 'Ir.....-~ ,. <br />'J ';, <br /> <br /> <br />"f <br /> <br />........~ <br />. '. <br /> <br />Soils Group IV - San Juan National Forest. Colorado <br /> <br />. ..C'O <br /> <br />Grazing. recreation, and timbering are major land uses for these <br />soils. The generally short growing season restricts choice of <br />crops. and there is only a low potential for irrigation. Approxi- <br />mately 54.000 acres are presently irrigated and about 17.000 acres <br />are in dry cropland. <br /> <br />111-18 <br /> <br />