Wetland classification, Identification and Delineation report-2004

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Morrisontown quadr�ngle; lat. 4-� degrees 7 minutes S7 seconds N. and long. 93 degrees _ 26 minutes 45 seconds W., NAD27. RANGE I1�1 CHARACTERISTICS: Depth to free carbonates ranges From 22 to 55 _ inches. The thickness of the mollic epipedon ranges frorn 10 to l8 inches. Rock fragment content is l to 8 percent by volume throughout and is of rr�ixed lithology. . � The A horizon has hue of lOYR, vaIue of 2 or 3, and chroma of I or 2. The A hocizon is cfay 1oam, loam, silt loam, or siiry ctay Ioam. It has 20 to 3p percent clay. It is moderately acid to neutrai. An E horizon as much as 3 inches thick is in some pedons. The AB horizan has characteristics similar to the A and the Bt. � � � The upper part of the Bt horizon has hue of lOYR or 2.SY, value of 3 to �, and chroma of - 2 or 3. 'The lower part of the Bt horizon has a f�ue of 2.5Y, value of 4 or 5, and chroma of 2 to 4. The Bt horizon is mostly clay loam or loam. The argillic horizon averages bet4veen 24 and 35 percent ciay and from 15 to 40 percent fine sand or coarser. The Bt horizon is strongly acid to slightly acid in the upper part and strongly acid to neutral in the lower part. The hulk�density ranges from 1.3Q to 1.45 gm/cc. Some pedans have a BC or Bk horizon. The C horizon has hue of 2.SY or SY, val.ue of 4 to 6, and chroma of 2 to 4. It is loam or clay loam. It is slightly alkaline or moderately aIkaline.The bulk density ranges from I.45 to 1.60 gm/cc. � COMPETING SERiES: These are the Andres, Aurand(T), Aztalan, Crane, Darroch, � Gilboa, Houstenader(T},La Ho�ie, Marcellon, Mokena,Nachusa, Nenno, Newhaven, Odell, Protivin,Tiderishi, Vi�ar, and Wilmer series. The Aurand(T) and Tiderishi series are presently not in the�SD file. The Andres,Aztalan, and Mokena soils have silty clay , loain lower B and C horizons. Aztalan soiis also have hue of 7.SYR in the B and C horizons. Crane soi�s have more than 8 percent rock fragments in Ehe lower part of the argillic horizon. Darrflch soils have C horizons of stratified silty and sandy sediments � within the series control section. Gilboa soils have silt loam and silty clay loam in the � ;�. upper part of the series control section. Houstenader soils have 30 to 40 percent gravel in , the lower third of the series control section.La Hogue soils have less than 20 percent clay in the lower part of the series control section. Marcellon soils have less than 24 percent clay in the argillic horizon. Nachusa soils do not have rock fragmants in the upper part of the series conteol section. Nenno soils have more than 8 percent rock fragments in the • lower part of the series control section.Nawhaven soils do not have free carbonates in the series control section. Odell soils have hue of lOYR in the lower B and C horizons and higher chroma in the upper B horizon. Protivin soils have bulk density greatez than 1.60 gm/ec in the iower part of the series control section. Vigar soils have a mollic epipedon greater than 24 inches thick, Wilmer soils have more than 40 percent fine sand or caarser in the argillic horizon. GEOGRAPHIC SETTING: The Le Sueur sails have slightly concave, plane, or slightly � � canvex slopes on moraines within the Des Moines lobe and Grantsburg sublohe of the Late Wisconsin gtaciation. They formed in a calcareous, loamy till. Slopes range from I �