LOCATION SHANNOCK RI

Tentative Series
Rev. MKP-JDT
04/2016

SHANNOCK SERIES

The Shannock series consists of very deep subaqueous soils permanently submerged beneath 0 to about 3 meters of water on shoreline and lake plain landscapes of freshwater ponds, lakes, and reservoirs. The soil formed in a thick mantle of recent lacustrine sediments over glacial lacustrine and/or glacial fluvial sediments. Slope ranges from 0 to 5 percent. The mean annual temperature is about 9 degrees C and the mean annual precipitation is about 1143 mm.

TAXONOMIC CLASS: Sandy, mixed, mesic Typic Humaquepts

TYPICAL PEDON: Shannock mucky fine sandy loam on a 5 percent slope permanently submerged beneath 3 meters of fresh water on a lake plain. (Colors are broken face moist soil unless noted differently.)

A1--0 to 12 cm; very dark brown (10YR 2/2) mucky fine sandy loam, dark grayish brown (10YR 4/2) dry, massive; very friable, extremely acid (pH 3.8 in water 1:1 using pH meter); abrupt smooth boundary. (0 to 12 cm. thick)

A2--12 to 52 cm; black (10YR 2/1) fine sandy loam, dark grayish brown (10YR 4/2) broken face, dry; massive; very friable, strongly acid (pH 5.3 in water 1:1 using pH meter); abrupt smooth boundary. (20 to 40 cm thick)

Cg1--52 to 69 cm; dark grayish brown (2.5Y 4/2) sand; single grain; extremely acid (pH 4.3 in water 1:1 using pH meter); clear smooth boundary

Cg2--69 to 94 cm; dark gray (5Y 4/1) sand; single grain; extremely acid (pH 3.8 in water 1:1 using pH meter); clear smooth boundary

Cg3--94 to 100 cm; dark gray (5Y 4/1) loamy fine sand; massive; very friable; very strongly acid (pH 5.0 in water 1:1 using pH meter); abrupt smooth boundary.

Cg4--100 to 161 cm; greenish gray (10Y 5/1) sand; single grain; loose; extremely acid ( pH 4.3 in water 1:1 using pH meter); abrupt smooth boundary

Cg5--161 to 177 cm; greenish gray (5GY 5/1) loamy fine sand; massive; very friable; moderately alkaline (pH 7.9 in water 1:1 using pH meter); abrupt smooth boundary

2Cg6--177 to 217 cm; 40 percent greenish gray (10Y 5/1) 30 percent (N4/1) broken face and 30 percent olive (5Y 5/3) broken face silt; massive; friable 3 percent distinct gray (10YR 6/1), moist, masses of reduced iron and 5 percent prominent yellowish brown (10YR 5/6), moist, masses of oxidized iron; slightly alkaline (pH 7.8 in water 1:1 using pH meter). (Combined thickness of the Cg horizons is 50 to 180 cm)

TYPE LOCATION: Washington County, Rhode Island; type location is located in about 3 meters of water along the eastern shoreline of Watchaug Pond; USGS Kingston, RI topographic quadrangle; latitude 41 degrees, 23 minutes, 5.24 seconds N. and longitude 71 degrees, 40 minutes, 58.55 seconds W; NAD 1983.

RANGE IN CHARACTERISTICS: The soils are permanently submerged.

Some pedons have a C horizon at the surface, ranging from 0 to 22 cm thick, representing a recent sedimentation event. When present, the C horizon has hue of 2.5Y or 10YR, value of 3 or 4, and chroma of 2 or 3. Texture ranges from loamy fine sand to sand. Reaction ranges from extremely acid to moderately acid.

Some pedons have an Oa horizon at the surface ranging from 0 to 12 cm in depth.

The A horizon has hue of 2.5Y, 10YR, or 7.5 YR, value of 2 to 5, and chroma of 1 to 3. Texture ranges from very fine sandy loam to sand. Reaction ranges from extremely acid to strongly acid. Gravel ranges from 0 to 10 percent.

The Cg horizon has a hue of 5GY, 5Y, 2.5Y, 10YR, or is neutral, value of 3 to 6, and chroma of 1 to 3. Texture ranges from silt loam to sand. Reaction ranges from extremely acid to slightly alkaline. Gravel ranges from 0 to 40 percent.

COMPETING SERIES: These are very poorly drained Newton and Brockton soils, both of which are not subaqueous.

GEOGRAPHIC SETTING: Shannock soils are found on permanently submerged lake plain and lake shore landscapes in freshwater ponds, lakes, and reservoirs. Slope ranges from 0 to 5 percent.

GEOGRAPHICALLY ASSOCIATED SOILS: These are Aquapaug, Tuckertown , Wickford , and Burlingame on nearby landscapes. Aquapaug soils are on lake bottoms and have sandy textures throughout the particle size control section. Tuckertown and Wickford soils have greater than 40 cm. of organic material. Burlingame soils have materials finer than loamy fine sand within the particle size control section.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Subaqueous soil, peraquic soil moisture regime, and moderately high or high saturated hydraulic conductivity due to soil texture. The soil is permanently submerged with water.

USE AND VEGETATION: Areas of this soil are used for recreational fishing, swimming, and aquatic wetland habitat. Vegetation includes bladderwort (Utricularia sp.), fanwort (Cabomba caroliniana), variable milfoil (Myriophyllum heterophyllum), white water lily (Nymphaea ordorata), and yellow water lily (Nuphar variegatum). Water bodies these soils are mapped in have an average pH of 6.5 and average temperature of 20 C during the summer months.

DISTRIBUTION AND EXTENT: This series is of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Amherst, Massachusetts.

SERIES PROPOSED: This is a tentative series.

REMARKS: Shannock soils are named for the village of Shannock, Rhode Island.
The soil was classified based on its properties and current taxonomy. This soil does not currently classify with other subaqueous soils due to the lack of subaqueous Inceptisols in the current version of soil taxonomy. A proposal to classify subaqueous soils in the Entisols order is under consideration.

Diagnostic horizons and features recognized in this pedon include:
1. Peraquic Feature - positive soil water potential (permanently submerged) at the soil surface
2. Umbric epipedon - the zone from 0 to 52 cm. (A1 and A2 horizons)
3. Particle size control section - 25 to 100 cm. (A, Cg1, Cg2, and Cg3 horizons)
4. Sandy particle size- textures of loamy sand or sand throughout the control section
5. Acid reaction class-the zone from 25 to 100 cm. has reaction less than about 5.5 in water, 1:1throughout the control section((A2, Cg1, Cg2, and Cg3 horizons).

Additional Data: Reference samples for the typical pedon from 2011RI009033, University of Rhode Island, 2011. Additional reference samples include pedons, 2011RI009015, 2011RI009037, 2011RI009001, 2011RI009041, 2011RI009040, 2011RI009013, 2011RI009014, and 2011RI009035, by the University of Rhode Island, 2011.

National Cooperative Soil Survey
U.S.A.