LOCATION TUMAGAN                 MD+DE NJ

Established Series
DMB/PK/Rev. SYD/RBT
05/2023

TUMAGAN SERIES

MLRA(s): 153D
Soil Survey Regional Office (SSRO) Responsible: Raleigh, North Carolina
Depth Class: Very deep
Drainage Class: Subaqueous (permanently submersed)
Saturated Hydraulic Conductivity: Moderately high to high in the organic material and low to moderately low in the mineral material
Parent Material: Submerged organic materials of Holocene age
Slope: 0 to 0.25 percent

TAXONOMIC CLASS: Euic, mesic Sapric Sulfiwassists

TYPICAL PEDON: Tumagan sandy loam, on permanently submerged wave-cut headland, under 40 centimeters of strongly saline water (Colors are for moist soil unless otherwise stated.)

Ase1--0 to 1 inch (0 to 2 centimeters); dark gray (5Y 4/1) sandy loam; massive; slightly sticky; non-fluid; sulphurous odor; slightly alkaline; abrupt boundary.

Cseg--1 to 2 inches (2 to 6 centimeters); dark greenish gray (10Y 3/1) silty clay; massive; slightly sticky; very fluid; 10 percent light olive brown (2.5Y 5/6) herbaceous fibers; sulphurous odor; neutral; clear boundary.

Oase--2 to 9 inches (6 to 24 centimeters); dark olive gray (5Y 3/2) muck; sulphurous odor; neutral; clear boundary.

C'seg--9 to 15 inches (24 to 39 centimeters); dark greenish gray (10Y 3/1) mucky silty clay loam; massive; slightly sticky; very fluid; sulphurous odor; slightly alkaline; clear boundary.

Oaseb1--15 to 28 inches (39 to 71 centimeters); very dark grayish brown (2.5Y 3/2) muck; sulphurous odor; slightly alkaline; clear boundary.

Oaseb2--28 to 40 inches (71 to 103 centimeters); black (10YR 2/1) muck; sulphurous odor; slightly alkaline; clear boundary.

C''seg--40 to 63 inches (103 to 160 centimeters); very dark greenish gray (5GY 3/1) silty clay; massive; slightly sticky; very fluid; 25 percent olive yellow (5Y 6/6) herbaceous fibers; sulphurous odor; neutral; clear boundary.

Oaseb--63 to 83 inches (160 to 210 centimeters); very dark brown (10YR 2/2) muck; sulphurous odor; slightly acid; clear boundary.

2Aseb--83 to 87 inches (210 to 220 centimeters); black (10YR 2/1) loam; massive; slightly sticky; moderately fluid; 7 percent olive brown (2.5Y 4/4) herbaceous fibers; sulphurous odor; slightly acid; clear boundary.

2Csegb--87 to 90 inches (220 to 229 centimeters); very dark greenish gray (10Y 3/1) sandy loam; massive; slightly sticky; non-fluid; sulphurous odor; slightly acid.

TYPE LOCATION: Worcester County, Maryland; just off the shoreline of Handys Hammock in Chincoteague Bay. USGS Tingles Island topographic quadrangle; lat. 38 degrees 12 minutes 25 seconds N. and long. 75 degrees 15 minutes 02 seconds W. WGS 84.

RANGE IN CHARACTERISTICS:
Depth to bedrock: Greater than 80 inches (200 centimeters)
Depth to seasonal high water table: Permanently submersed
Shell Fragments: None
Soil reaction: Slightly acid to moderately alkaline;
Oxidized reaction: Ultra acid
Depth to Lithologic Discontinuity: 30 to 50 inches (75 to 125 centimeters)
Depth to sulfidic materials: 0 to 20 inches (0 to 50 centimeters)
Electrical Conductivity: Greater than 16 mmhos/cm throughout the profile
Salinity: Greater than 25 ppt throughout the profile

Range of Individual Horizons:
Ase horizon:
Color--hue of 5Y, value of 4, and chroma of 1
Texture--sandy loam or silty clay
Consistence--non-fluid to very fluid and slightly sticky
Sulphurous odor and sulfidic materials are present.

Cseg horizons:
Color--hue of 2.5Y, 10Y or 5 GY, value of 2.5 to 4, and chroma of 1
Texture--silty clay loam or silty clay or their mucky modifiers
Consistence--very fluid and slightly to moderately sticky
Organic fragments may be present.
Sulphurous odor and sulfidic materials are present.

Oase horizon:
Color--hue of 10YR to 5Y, value of 3, chroma of 1 to 3
Texture--muck
Sulphurous odor and sulfidic materials are present.

Oaseb horizon:
Color--hue of 10YR to 5Y, value of 2 or 3, chroma of 1 or 2
Texture--muck
Sulphurous odor and sulfidic materials are present.

2Ab horizon:
Color--hue of 10YR, value of 2, chroma of 1
Texture--loam
Consistence is moderately fluid and slightly sticky
Organic fragments may be present.
Sulphurous odor and sulfidic materials are present.

2Cgb horizon:
Color--hue of 10Y, value of 3, chroma of 1
Texture--sandy loam
Consistence--non-fluid and slightly sticky
Organic fragments may be present.
Sulphurous odor and sulfidic materials are present.

COMPETING SERIES:
None

GEOGRAPHIC SETTING:
Landscape: Mid-Atlantic Coastal Plain estuaries
Landform: Mainland coves or submerged wave-cut headlands of Holocene age
Parent Material: Submerged organic materials formed at or near sea level when sea level was at a lower elevation
Slope: 0 to 0.25 percent
Mean Annual Air Temperature: 50 to 57 degrees F. (10 to 14 degrees C.)
Mean Annual Water Temperature: 52 to 58 degrees F. (11 to 14 degrees C.)
Water Regime: Tidal, 1.0 to 3.0 feet tidal range
Water Salinity Range: 26 to 32 ppt

GEOGRAPHICALLY ASSOCIATED SOILS:
Tingles soils--are fine-silty soils formed in lagoonal sediments on lagoon bottoms.
Southpoint soils--are fine-silty soils formed in lagoonal sediments, relict marsh sediments, and upland subaerial soils on mainland coves and submerged wave-cut headlands. Southpoint soils do not have thick organic materials within 16 inches (40 centimeters) of the soil surface.
Truitt soils--are fine-silty soils formed in lagoonal sediments over buried organic horizons that formed at or near sea level when sea level was at a lower elevation, on submerged wave-cut headlands or mainland coves. The buried organic materials occur below 40 inches (1 meter) and are greater than 2 inches (5 centimeters) thick.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage Class: Subaqueous and peraquic soil moisture regime
Saturated Hydraulic Conductivity: Moderately high to high in the organic horizons and low to moderately low in the mineral horizons

USE AND VEGETATION: Most areas are un-vegetated and function as estuarine benthic wildlife habitat is limited. Benthic fauna such as tubeworms, clams, juvenile blue crabs, scallops and juvenile finfish are rare. Native vegetation includes rooted algae, eelgrass (Zostera marina) and widgeon grass (Ruppia maritima). Vegetative cover ranges from 0 to 5 percent.

DISTRIBUTION AND EXTENT:
Distribution: Maryland, Delaware, New Jersey, and possibly Virginia
Extent: Small

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Raleigh, North Carolina

SERIES PROPOSED: Worcester County, Maryland, 2007

REMARKS:
Soil is permanently submerged with salt or brackish water. The presence of sulfidic material within 50 cm of the soil surface puts these soils at risk for acid sulfate drainage if they are dredged and exposed to the air.

Diagnostic horizons and features recognized in this pedon are:
Peraquic feature - Positive soil water potential (permanently submerged) at the soil surface. (Under 73 inches (185 centimeters) of salt water)
Sulfidic materials - within 20 inches (50 centimeters) of the soil surface (the A, Cg, and Oa horizons).


MLRA = 153D

ADDITIONAL DATA:
Balduff, D.M., 2007. Pedogenesis, Inventory, and Utilization of Subaqueous Soils in Chincoteague Bay, Maryland. Ph.D. Dissertation. University of Maryland.

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National Cooperative Soil Survey
U.S.A.