Laserfiche WebLink
5.3.2 GEOLOGY (Continued) <br />Btg2-22 to 35 inches; very dark gray (10YR 3/1) clay, dark gray (10YR 4/1) dry; weak and moderate <br />medium and coarse angular blocky structure; extremely hard, very firm; few grooved and polished <br />pressure faces 2 to 5 inches across; few very One pores; thin clay films on faces or peds; Ap and B1 <br />material in crack fillings; few iron manganese concretions; neutral; diffuse wavy boundary. (8 to 25 <br />inches thick) <br />Btg3-35 to 50 inches; dark gray IN 4/0) clay, gray IN 5/0) dry, few fine distinct yellowish brown and <br />strong brown mottles; weak coarse angular blocky structure; extremely hard, very firm; few grooved <br />and polished pressure faces 2 to 5 inches across; few patchy clay films on faces of peds; few iron <br />manganese concretions; mildly alkaline; gradual wavy boundary. (10 to 30 inches thick) <br />Btg4-50 to 60 inches; grayish brown (2.5Y 5/2) clay, light brownish gray (2.5Y 6/2) dry; common <br />medium faint to distinct yellowish brown mottles; weak subangular structure; extremely hard, veryfirm; <br />few iron manganese concretions; few fine pitted calcium carbonate concretions; nontalcareous in <br />matrix; moderately alkaline; gradual wavy boundary. (8 to 30 inches thick) <br />BC--60 to 78 inches; brown (10YR 5/3) clay loam, pale brown (10YR 6/3) dry; common coarse distinct <br />strong brown (7.SYR 5/6) and grayish brown (2.SY 5/2) mottles; very hard, firm; few fine and medium <br />calcium carbonate concretions; noncalcareous in matrix, moderately alkaline; gradual smooth boundary. <br />(0 to 30 inches thick) <br />2C-78 to 90 inches; strong brown (7.SYR 5/6), sandy clay loam, reddish yellow (7.5YR 6/6), dry; <br />massive; hard, friable; calcareous; moderately alkaline. <br />TYPE LOCATION: Fort Bend County, Texas; about 0.3 mile east of Tavener which is about 30 miles west <br />of Rosenberg, 450 feet east and 3DO feet south of intersection of an unpaved road and U.S. Highway 90 <br />A. <br />RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to more than 80 inches. The mollic <br />epipedon ranges from 16 to 50 inches thick and includes the upper part of the argillic horizon in most <br />pedons. <br />The A horizon has hue of IOYR, 2.5Y, or N, value of 2 or 3, and chroma of 2 or less. Texture is mostly clay <br />loam, but ranges to loam. Reaction is medium acid or neutral. <br />The Btg1 horizon has hue of 10YR, 2.SY, SY, or N, values of 2 or 3, and chroma of 1 or less. It is clay loam <br />or clay and contains more than 35 percent clay. Reaction is medium acid or neutral. <br />The lower Btg horizons have hue of 10R, 2.5Y, 5Y, or N, value of 2 to 5, and chroma of 2 or less. Mottles <br />of yellow or brown range from none to common. It is clay, clay loam, or silty clay containing 35 to 60 <br />percent clay. Reaction is slightly acid to moderately alkaline. A few concretions of calcium carbonate <br />are below depths of 36 inches in most pedons. <br />The BC or BCk horizon, where present, is gray, grayish brown, or brown, or it is mottled olive, yellow, <br />and brown. Reaction is neutral through moderately alkaline and in some pedons the soil is calcareous. <br />Depth to the redder, sandier 2C horizon ranges from 60 to more than 80 inches; and it is absent in some <br />pedons. <br />Commercial Property Geo-Tech Emironmental Inc. <br />Broadway & East A St., la Porte, TX 77571 Project Number:06343 <br />26 <br />