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<br />seldom so great as 50 feet. A few basalt dikes and even fewer <br /> <br /> <br />basalt sills have been observed intruded into the Vermejo formation. <br /> <br /> <br />3. Soil Associations. The soil associations in and adjacent <br /> <br /> <br />to the project area are landscapes or geographic areas that have a <br /> <br />distinctive proportional pattern of soils. There are four general <br /> <br />associations that occupy portions of the project area. Generally <br /> <br />ascending from water courses, these are: <br /> <br />a. Fluvents association: Warm, deep, well drained, <br /> <br />nearly level soils on flood plains and low terraces. <br /> <br />b. HaplarRids - Camborthids association: Warm, deep, <br /> <br />well drained, nearly level and gently sloping soils are mesas and <br /> <br />terraces. <br /> <br />. <br /> <br />c. Kim - Scholle - Cascajo association: Warm, deep, <br /> <br /> <br />well-drained, sloping to moderately steep soils on uplands. <br /> <br /> <br />d. Camborthids - Torriorthents - Haplargids associations: <br /> <br /> <br />Warm, dominantly shallow, well drained, steep soils on hills, breaks <br /> <br /> <br />and canyons. <br /> <br />4. Biotic Communities. The general project area is located <br />within the upper Sonoran Life Zone, and the life forms present are <br />representative of the classification. However, in local situations, <br /> <br /> <br />exposure snd water supply have a greater effect on the flora than <br /> <br /> <br />does altitude. This is indicated by the inversion of the normal <br /> <br /> <br />altitudinal distribution of life zones. Many species follow perennial <br /> <br /> <br />and ephemeral water courses far below their normal minimal elevation. <br /> <br /> <br />For example, Transitional Zone species, e.g., ponderosa pine, extend <br /> <br />into the pinon-juniper woodland. <br /> <br />11-18 <br /> <br />. <br />