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6. Soils and Geomorphology —1988 (PR -02) <br />The study area occupies the part of the gently sloping western portion of "First Park," an irrigated <br />area adjacent to Nucla on the east, south, and west. The study area is shown in Map 2.04.9 -1. The <br />ephemeral drainages generally cross the study area from northeast to southwest. Numeroussmall <br />man made ponds have been created along many of these drainages. Calamity Draw flows from <br />east to west along the southern border of the study area. Sewage lagoons for the town of Nucla <br />are located adjacent to Calamity Draw. Tuttle Creek flows from east to west along the northern <br />border of the study area. Many of the irrigation ditches which cross the study area empty into <br />Calamity Draw and Tuttle Creek. <br />Aquolls and Aquepts soils were found primarily as a result of flood irrigation accumulating in the <br />drainages. These soils have characteristics indicating they are wet throughout most of the soil <br />profile for most of the year. <br />Gently sloping uplands comprise most of the study area. Progresso and Pinon soils are found on <br />these areas. Pinon is less than 20 inches to bedrock, whereas Progresso is 20 to 40 inches. <br />Progresso soils developed in residuum from interbedded sandstone and shale and have well <br />developed Bt argillic horizons and underlying Bk calcic horizons. The Barx soil is found as an <br />inclusion with Progresso and Pinon. Pinon soils are developing in thin residuum from sandstone <br />in areas where sandstone ledge rock is near or at the surface. Weathered shale bedrock is often <br />found beneath the relatively thin sandstone ledge rock. Pinon soils have a zone of secondary <br />calcium carbonate accumulation. <br />The Barx soil is deep (40 to 60 inches to either sandstone or shale bedrock) to very deep (greater <br />than 60 inches to either sandstone or shale bedrock) and has a well developed Bt argillic and Bk <br />calcic horizon. It has loam, sandy clay loam, or clay loam textures in the Bt particle size control <br />section, and is developing in wind deposited loess over residuum from sandstone and shale at <br />depth in the soil profile. The Barx soil is found on the gently sloping mesa -like surface in the <br />southeast corner of the study area. <br />Revised September 2010 (PR 06) 2.04.9 -4 <br />