LOCATION MACHAPUNGA              NC

Established Series
ARW
10/2024

MACHAPUNGA SERIES

MLRA--153B
Depth Class--Very deep
Drainage Class--Subaqueous (permanently submersed / continuously ponded)
Saturated Hydraulic Conductivity--Moderately high to high
Parent Material--Coarse-silty and coarse-loamy lacustrine deposits
Slope--0 to 2 percent
Mean Annual Air Temperature--16 degrees C (62 degrees F)
Mean Annual Water Temperature--20 degrees C (68 degrees F)

TAXONOMIC CLASS: Coarse-silty, mixed, semiactive, nonacid, thermic Humic Frasiwassents

TYPICAL PEDON: Machapunga very fine sandy loam on a lakebed with less than 2 percent slope under 1.2 meters of freshwater (Colors are for moist soil unless otherwise stated; electrical conductivity is 1:5 by volume solution mixture unless otherwise stated).

Ase--0 to 11 centimeters (0 to 4 inches); variegated 70 percent very dark gray (2.5Y 3/1) and 30 percent grayish brown (2.5Y 5/2) very fine sandy loam; structureless massive; slightly sticky, nonplastic; slightly fluid; few fine roots throughout; 2 percent charcoal fragments; slightly acid (pH 6.4), moderately acid (pH 5.6) oxidized pH; no color reaction with 3% hydrogen peroxide; slightly effervescent with 30% hydrogen peroxide; nonsaline (0.1291 dS m-1); gradual boundary. (11 to 23 centimeters thick)

Cseg1--11 to 45 centimeters (4 to 18 inches); variegated 60 percent very dark gray (10YR 3/1) crushed and 40 percent gray (2.5Y 6/1) very fine sandy loam; structureless massive; nonsticky, nonplastic; nonfluid; very few fine roots throughout; slightly acid (pH 6.5), neutral (pH 7.1) oxidized pH; no color reaction with 3% hydrogen peroxide; slightly effervescent with 30% hydrogen peroxide; nonsaline (0.1015 dS m-1); clear boundary.

Cseg2--45 to 212 centimeters (18 to 83 inches); dark greenish gray (5GY 4/1) very fine sandy loam; structureless massive; slightly sticky, nonplastic; nonfluid; 3 percent fine distinct weak red (10R 4/4) plinthite nodules with clear boundaries lining pores; slightly acid (pH 6.5), slightly alkaline (pH 7.5) oxidized pH; no color reaction with 3% hydrogen peroxide; moderately effervescent with 30% hydrogen peroxide; nonsaline (0.1399 dS m-1); abrupt boundary.

Cseg3--212 to 231 centimeters (83 to 91 inches); gray (2.5Y 5/1) fine sand; structureless single grain; nonsticky, nonplastic; nonfluid; slightly acid (pH 6.5), moderately alkaline (pH 7.9) oxidized pH; no color reaction with 3% hydrogen peroxide; slightly effervescent with 30% hydrogen peroxide; nonsaline (0.0649 dS m-1).

TYPE LOCATION: Hyde County, North Carolina; Lake Mattamuskeet; 2.7 miles north-northeast of Lake Mattamuskeet Hunting Lodge, 4.28 miles northwest of Mattamuskeet High School. USGS New Holland topographic quadrangle.

Latitude-35.4917760
Longitude-- -76.1755830
Datum--WGS84
Coordinate source-from hand-held GPS

RANGE OF CHARACTERISTICS:
Depth to Bedrock--Greater than 200 cm
Depth to Seasonal High-Water Table--Permanently submerged
Depth to hyper-sulfidic materials (incubated pH <4.0)--often greater than 100 centimeters
Manner of Failure / Fluidity Class--Nonfluid to slightly fluid; moderately fluid where silty soil materials are dominant.
Charcoal Fragments--0 to 5 percent, by volume
Soil Reaction--Moderately acid to neutral throughout profile
Electrical Conductivity--Less than 0.2 dS m-1 throughout profile by 1:5 by volume solution mixture
Salinity Class--Nonsaline throughout profile
Reaction to 30% Hydrogen Peroxide--None to moderate reaction throughout profile
Color Reaction to 3% Hydrogen Peroxide--No reaction throughout profile

Ase or Apse (where present) or Aseg (where present) horizon:
Hue--10YR, 2.5Y, or 5Y
Value--2 to 3
Chroma--1 or 2
Texture--fine sand, very fine sandy loam, fine sandy loam, sandy loam, loam, silt loam, or their mucky analogs
Manner of failure / fluidity class--nonfluid to moderately fluid

Bhsse or Bsse horizon (where present):
Hue--7.5YR or 10YR
Value--3 to 5
Chroma--1 to 4
Texture--fine sand, loamy sand, or loamy fine sand
Manner of failure / fluidity class--nonfluid

Cseg horizon:
Hue--7.5YR to 10Y, or 5GY
Value--3 to 6
Chroma--1 to 4
Texture--fine sand, loamy fine sand, fine sandy loam, very fine sandy loam, loam, or silt loam
Manner of failure / fluidity class--nonfluid or slightly fluid

2Ab or 2Aseb horizon (where present):
Hue--7.5YR or 10YR
Value--2 to 3
Chroma--1 or 2
Texture--very fine sandy loam, fine sandy loam, loam, silt loam, clay loam, silty clay loam or their mucky analogs
Manner of failure / fluidity class--nonfluid to moderately fluid

2Cg or 2Cseg horizon (where present):
Hue--7.5YR to 10Y, or 5GY
Value--4 to 6
Chroma--1 to 3
Texture--sand, loamy very fine sand, very fine sandy loam, silt loam, or silty clay loam
Manner of failure / fluidity class--nonfluid or slightly fluid

3Cg or 3Cseg horizon (where present):
Hue--2.5Y to 10Y, 5GY, or 5G
Value--3 to 6
Chroma--1 or 2
Texture--sand, loamy very fine sand, loamy sand, very fine sandy loam, loam, or clay loam
Manner of failure / fluidity class--nonfluid or slightly fluid

COMPETING SERIES:
There are no competing series in the same family.

GEOGRAPHIC SETTING:
Parent Material--Coarse-silty and coarse-loamy lacustrine deposits
Landscape--Southeast Coastal Plain Lakes and Carolina Bays
Landform--Lakebeds, submerged wave-cut platforms, and submerged lake terraces.
Slope--0 to 2 percent
Mean Annual Air Temperature--15 to 19 degrees C (59 to 66 degrees F)
Mean Annual Water Temperature--15.5 to 20 degrees C (60 to 68 degrees F)
Water Depth Range--0 to 1.5 meters (0 to 4 feet) below mean sea level
Water Regime--Nontidal
Water Salinity Range--Nonsaline

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Belhaven, Cipre, Coree, Engelhard, Flyway, Great Ditch and Newholland soils.
Belhaven soils--are in very poorly drained areas on flats, depressions, and flood plains in the Lower Coastal Plain; these soils formed in highly decomposed organic matter underlain by loamy marine deposits
Cipre soils--are on permanently submerged wave-cut platforms and lake beds in the coastal plain; these soils formed in woody organic material underlain by sandy lacustrine deposits.
Coree soils--have buried A horizons placing them into the Thapto-humic subgroup and have coarser textured materials
Engelhard soils--are in poorly drained lake-wash rims along Lake Mattamuskeet, these soils formed in sandy lacustrine lake-wash deposits that contain a high content of very fine sand and are underlain by marine or fluvial deposits.
Flyway and Great Ditch soils--are on permanently submerged wave-cut platforms and lake terraces in the coastal plain, these soils formed in sandy lacustrine deposits.
Newholland soils--are on very poorly drained broad upland flats and along the outer edges of pocosins or flood plains in the coastal plain; these soils formed in loamy marine and fluvial deposits.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage Class--Subaqueous (permanently submerged)
Saturated Hydraulic Conductivity--Moderately high to high
Soil Moisture Regime--Peraquic

USE AND VEGETATION:
Major Uses--Most areas are unvegetated and function minimally as littoral and limnic habitat. Recreational use is waterfowl, hunting, and observation; historically, there was extensive fishing and boating. There are no known commercial uses.
Dominant Vegetation--Isolated clusters of Bald Cypress (Taxodium distichum) and historically wild celery (Vallisneria americana), sago pondweed (Stuckenia pectinate), southern naiad (Najas guadalupensis), and redhead grass (Potamogton perfoliatus).

DISTRIBUTION AND EXTENT:
General area--Natural lakes and Carolina Bays in the coastal plain of North Carolina and South Carolina.
Region--T - Atlantic and Gulf Coast Lowland Forest and Crop Region
MLRA(s)--153B
Extent--Small

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: SPECIAL PROJECTS OFFICE

SERIES ESTABLISHED: Hyde County, North Carolina, 2024

REMARKS:
Machapunga is derived from the Algonquin Machapunga Native American tribe who inhabited the Pungo River area and established the village of Mattamuskeet along the original shoreline of the lake prior to colonialization.

Diagnostic horizons and other diagnostic soil characteristics recognized in this pedon are (Keys to Soil Taxonomy, Thirteenth Edition, 2022)--

n-value > 0.7--0 to 11 centimeters (Ase horizon, 0 to 4 inches)
Reduced Matrix--0 to 231 centimeters (0 to 91 inches); soil matrix that has low chroma in situ but undergoes a change in hue or chroma within 30 minutes after the soil material has been exposed to air
Ochric Epipedon--0 to 11 centimeters (Ase horizon, 0 to 4 inches); equivalent depth of soil that has not been plowed.
Endosaturation--0 to 231 centimeters (0 to 91 inches)
Peraquic feature-Zero or positive soil water potential at the soil surface.

Data Map Unit ID: 919143
NASIS User Site and Pedon ID: S2022NC095125
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National Cooperative Soil Survey
U.S.A.