LOCATION OVERBOARD MD+NJ
Established Series
CEP/DCS
10/2022
OVERBOARD SERIES
MLRA(s): 149A
Soil Survey Regional Office (SSRO) Responsible: Raleigh, North Carolina
Depth Class: Very deep
Drainage Class: Subaqueous (permanently submersed / continuously inundated)
Saturated Hydraulic Conductivity: Moderately high to high
Parent Material: Fine-loamy, glauconitic estuarine deposits over Fine-loamy, glauconitic fluviomarine deposits
Slope: 0 to 3 percent
Mean Annual Air Temperature: 13 degrees C. (55 degrees F.)
Mean Annual Water Temperature: 12 degrees C. (53 degrees F.)
TAXONOMIC CLASS: Fine-loamy, glauconitic, nonacid, mesic Fluventic Sulfiwassents
TYPICAL PEDON: Overboard loam on a permanently submerged tidal creek platform landform with less than 3 percent slope under 3.0 meters of estuarine water. (Colors are for moist soil unless otherwise stated).
Aseg -- 0 to 20 cm; black (N 2.5/) loam; massive; very fluid; moderately alkaline (pH 8.1), very strongly acid (pH 5.0) after 16 weeks; slight hydrogen sulfide odor; color reaction with 3% hydrogen peroxide, slightly effervescent with 30% hydrogen peroxide; clear boundary.
Cseg1 -- 20 to 38 cm; greenish black (10Y 2.5/1) loam; massive; very fluid; 1 percent by volume wood fragments; moderately alkaline (pH 8.0), ultra acid (pH 3.4) after 16 weeks; slight hydrogen sulfide odor; color reaction with 3% hydrogen peroxide, slightly effervescent with 30% hydrogen peroxide; clear boundary.
Cseg2 -- 38 to 50 cm; greenish black (5GY 2.5/1) loam; massive; very fluid; 1 percent wood fragments; moderately alkaline (pH 8.0) extremely acid (pH 3.5) after 16 weeks; slight hydrogen sulfide odor; color reaction with 3% hydrogen peroxide, slightly effervescent with 30% hydrogen peroxide; clear boundary.
Asegb1 -- 50 to 84 cm; black (N 2.5/) silt loam; massive; very fluid; 1 percent by volume shell fragments; moderately alkaline (pH 8.1), extremely acid (pH 3.8) after 16 weeks; slight hydrogen sulfide odor; reaction with 3% hydrogen peroxide, slightly effervescent with 30% hydrogen peroxide; gradual boundary.
Asegb2 -- 84 to 123 cm; black (N 2.5/) loam; massive; moderately fluid; moderately alkaline (pH 8.1), extremely acid (pH 3.9) after 16 weeks; slight hydrogen sulfide odor; reaction with 3% hydrogen peroxide, slightly effervescent with 30% hydrogen peroxide; gradual boundary.
C'seg -- 123 to 176 cm; greenish black (10GY 2.5/1) silt loam; massive; moderately fluid; trace shell fragments; slightly alkaline (pH 7.7), extremely acid (pH 3.8) after 16 weeks; slight hydrogen sulfideodor; color reaction with 3% hydrogen peroxide, slightly effervescent with 30% hydrogen peroxide; gradual boundary.
2Cg1 -- 176 to 226 cm; black (5Y 2.5/1) silt loam; massive; slightly fluid; 1 percent by volume shell fragments; slightly alkaline (pH 7.6), strongly acid (pH 5.4) after 16 weeks; no color reaction with 3% hydrogen peroxide, no effervescent with 30% hydrogen peroxide; gradual boundary.
2Cg2 -- 226 to 276 cm; black (5Y 2.5/1) silt loam; massive; slightly fluid; 10 percent by volume root fragments; slightly alkaline (pH 7.5), moderately acid (pH 5.7) after 16 weeks; no color reaction with 3% hydrogen peroxide, no effervescent with 30% hydrogen peroxide; gradual boundary.
2Cg3 -- 276 to 317 cm; black (5Y 2.5/1) silt loam; massive; slightly fluid; 10 percent by volume root fragments; neutral (pH 7.3), moderately acid (pH 5.9) after 16 weeks; no color reaction with 3% hydrogen peroxide, no effervescent with 30% hydrogen peroxide; gradual boundary.
TYPE LOCATION: Anne Arundel County, Maryland; Broad Creek in South River River, approximately 5,800 feet north of Porter point and approximately 3,850 feet southeast of the interchange of Route 50 and Interstate 97 and approximately 2,100 feet northeast of South River Manor. USGS South River topographic quadrangle; latitude 38 degrees, 58 minutes, 28.84 seconds N. and longitude 76 degrees, 34 minutes, 24.88 seconds W., WGS 1984; Major Land Resource Area 149A.
RANGE IN CHARACTERISTICS:
Depth to bedrock: Greater than 200 centimeters
Depth to seasonal high water table: Permanently submersed
Depth to hyper-sulfidic materials (incubated pH 4.0): 0 to 50 centimeters
Depth to Lithologic Discontinuity: 83 to 176 centimeters
Manner of Failure / Fluidity Class: moderately to very fluid throughout the estuarine deposits; slightly and nonfluid in the Tertiary fluviomarine deposits.
Shell Fragments: 0 to 10 percent, by volume, throughout estuarine deposits; 0 to 2 percent in the fluviomarine deposits.
Soil reaction: Moderately alkaline to strongly acid throughout; oxidized reaction: very strongly acid to ultra acid in the estuarine deposits, slightly to moderately acid in the fluviomarine deposits
Electrical Conductivity: greater than 1.4 dS / m-1 in estuarine deposits, less than 1.2 dS / m-1 in fluviomarine deposits by 1:5 by volume solution mixture
Greater than 20% glauconite by weight in the fine-earth fraction.
RANGE OF INDIVIDULA HORIZONS:
Aseg horizon:
Color - hue N, 10Y, 5GY, 10GY; value of 2.5 to 4; and chroma of 0 to 2
Texture - fine sandy loam, very shelly loam, loam, clay loam, silt loam
Cseg and prime horizons:
Color - hue of 10Y, 5Y, N, 5GY, 10GY, 10G; value of 2.5 to 4; and chroma of 1
Texture - sandy loam, fine sandy loam, loam, clay loam, silt loam, silty clay loam
Asegb, Agb, or 2Asegb (if present):
Color - hue of 10Y, N, 5GY, 10GY; value of 2.5 and 3; and chroma of 1
Texture - sandy loam, loam, silt loam, silty clay loam
2Btse, 2Btg or 2Btseg (if present):
Color - hue of 10YR, 10Y, 5Y, N, 5GY, 5G; value of 2.5 to 6; and chroma of 0 to 4
Texture - sandy loam, sandy clay loam, clay, silty clay loam
2Cseg, 2C, or 2Cg horizon:
Color - hue of 7.5 YR, 10YR, 10Y, 5Y, 2.5Y, N, 5GY; value of 2.5 to 5; chroma of 0 to 6
Texture - sand, loamy coarse sand, loamy sand, loam, silt loam
COMPETING SERIES: None.
GEOGRAPHIC SETTING:
Landscape: Northern Coastal Plain Estuaries
Landform: Estuarine tidal creek platforms and mainland coves
Parent Material: Fine-loamy, glauconitic estuarine deposits over Fine-loamy, glauconitic fluviomarine deposits
Slope: 0 to 2 percent
Mean Annual Air Temperature: 11 to 15 degrees C. (52 to 59 degrees F.)
Mean Annual Water Temperature: 10 to 16 degrees C. (50 to 60 degrees F.)
Water Depth Range: 0 to 9.8 feet (0 to 3 meters)
Water Regime: Tidal, 0 to 2 feet (0 to 0.6 meters) tidal range
Water Salinity Range: 7 to 20 ppt
GEOGRAPHICALLY ASSOCIATED SOILS:
Broad Creek soils - fine-loamy soils that occur on estuarine tidal stream channel landforms; includes hypersulfidic materials and a buried A horizon.
Duvall Creek soils - sandy soils formed in stratified Holocene sands on submerged wave-built terrace landforms.
Hillsmere soils -fine-loamy soils that occur on estuarine channel and mainland cove landforms; composed of fine estuarine deposits throughout; and contain hypersulfidic materials.
South River soils - coarse-loamy soils occur on Wave-Cut Platform landforms; composed of sandy estuarine deposits overlying Tertiary fluviomarine material; has greater than 15% glauconite by volume in the fine earth fraction and horizons with chroma 3 or more between 15 and 100 cm.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage Class: Subaqueous drainage
Saturated Hydraulic Conductivity: Moderately high to high
Soil Moisture Regime: Peraquic
Soil is permanently submerged / continuously inundated with brackish water. The presence of hypo-sulfidic materials within 50 cm of the soil surface puts these soils at extreme risk for potential acid sulfate soil formation if they are dredged and exposed to the air.
USE AND VEGETATION:
Major Uses: Areas of this soil are used for recreational fishing, swimming, and boating. Commercial uses include shell fishing and aquaculture.
Dominant Vegetation: Benthic fauna such as clams, blue crabs, and oysters are associated with this soil. Eelgrass (Zostera marina), sea lettuce (Ulva sp.), and horned pondweed (Zannichellia palustris) may occur on these soils.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Raleigh, North Carolina.
DISTRIBUTION AND EXTENT: Northern Atlantic Coastal Plain sub-estuaries of the western portion of the Chesapeake Bay and Atlantic Seaboard estuaries of the Northern Coastal Plain in New Jersey. MLRA 149A. This series is of small extent.
SERIES ESTABLISHED: Anne Arundel County, Maryland, 2022.
REMARKS: This subaqueous soil series is named for subaqueous equipment that fell "overboard" during this project on the South River sub-estuary of the Chesapeake Bay. The equipment was retrieved and remains operational.
Areas of Overboard soils were formerly included with water.
Diagnostic horizons and other diagnostic soil characteristics recognized in this pedon are (Keys to Soil Taxonomy, Twelfth Edition, 2012):
Ochric epipedon - the zone from 0 to 20 centimeters (Ase horizon)
Peraquic feature - the zone from 0 to 317 centimeters is permanently saturated
Hyper-sulfidic materials - the zone from 0 to 176 centimeters incubated pH values less than 4 after 16 weeks
Lithologic Discontinuity - the zone from 176 to 317 centimeters (horizons 2Cg1, 2Cg2, 2Cg3 horizons of Tertiary aged fluviomarine deposits)
ADDITIONAL DATA: Park, C.E., University of Maryland, Master of Science, 2021; thesis; Subaqueous Soils of South River, Maryland: Soil-Landscape Model Evaluation
Data Map Unit ID: 883192
NASIS user site and pedon ID: 2021MD003049
National Cooperative Soil Survey
U.S.A.