IDENTIFIERS

Current Taxon Name (Soil Name): Surpur

OSD

Series Extent

User Site ID: S1986CA605REDW005

User Pedon ID: S10CA023027

Vegetation Plot ID: S1986CA605REDW005

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - SSL

Lab Pedon # - 10N0698

NCSS Pedon Lab Data NASIS Record ID - 58624

Print Date: 4/23/2025

LOCATION

Location In Web Soil Survey

AOI is roughly a square mile and pedon is marked in the center.

Location in SoilWeb

Location in Google Maps

Std. Latitude: 41.2449131

Std. Longitude: -124.0599941

Datum: WGS84

Township: 10N

Range: 1E

Section: 22

PLSS Details: southwest quarter, southwest quarter

Location Description: Redwood National Park, Humboldt County, California; 100 ft n at 345 degrees from L-2 road; 0.5 miles s of junction with L-2-2 road; on ridge between Elam amd McArthur creeks.

Map Unit: 251—Surpur, 2 to 9 percent slopes

State: California

County: CA023—Humboldt

MLRA: 4—California Coastal Redwood Belt

Non-MLRA Soil Survey Area: CA605—Humboldt and Del Norte Area, California

7.5 Minute USGS Quad: 41124-B1—Rodgers Peak, California

PEDON

Describers Name: Jim Popenoe & Nancy Sturhan

Current Taxonomic Class: Fine-loamy, mixed, active, isomesic Typic Haplohumults

Current Taxon Kind: series

Pedon Type: within range of map unit

Pedon Purpose: full pedon description

Pedon Record Orgin: NASIS

Pedon #: 27

Correlated Information:

Soil Name - Surpur

PSC - 28 to 78 cm.

Classificaton Date - 4/12/2010

Soil Taxonomic Edition - tenth edition

Moisture Class - udic

Moisture Subclass - typic

Sampled As Information:

Soil Name - Surpur

Classificaton Date - 7/29/1986

Dynamic Soil Properties:

Erosion Class - 0

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Parent Material: marine deposits derived from mixed sources

Landscape: mountains

Landform: mountain on uplifted marine terrace

Geomorphic Component Mountains: mountaintop

Hill Slope Profile: summit

Slope Complexity: simple

Slope Shape Across: linear

Slope Shape Down: linear

Runoff: medium

Drainage Class: well

Flooding: none flooding

Ponding: none ponding

Geology: Marine Sediments formation.

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 7/29/1986 (actual site observation date)

Air Photo ID: 4-20

Surface Water Kind: none observed

Plant Association Name: Redwood-Douglas-fir Forest

Surface Cover Properties:

Site Obs. Cover Kind 1 - tree cover

Site Obs. Cover Kind 2 - conifers

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Vegetation Plot Plants
Plant Symbol	Scientific Name	National Vernacular Name	Plant Type Group	Canopy Cover %	Vegetation Stata Level
PSME SESE3 LIDE3 TSHE GASH RUUR BAPI VAOV2 WHMO	Pseudotsuga menziesii Sequoia sempervirens Lithocarpus densiflorus Tsuga heterophylla Gaultheria shallon Rubus ursinus Baccharis pilularis Vaccinium ovatum Whipplea modesta	Douglas-fir redwood tanoak western hemlock salal California blackberry coyotebrush California huckleberry common whipplea	— — — — — — — — —	— — — — — — — — —	— — — — — — — — —

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
ochric epipedon argillic horizon	0—28 28—204	—28— —176—

Setting and Climate
Slope	Slope Length USLE	Upslope Length	Elev.	Corr. Elev	Aspect	MAP	REAP	FFD	MAAT	MSAT	MWAT	MAST	MSST	MWST	MFFP	PE Index	Climate Station ID	Climate Station Name	Climate Station Type
%	m				degrees	mm	mm		C						mm
3	—	—	370	—	150	2150	—	280	11	—	—	—	—	—	—	—	—	—	—

Oi—0 to 4 centimeters (0.0 to 1.6 inches); slightly decomposed plant material; fragments; noneffervescent; abrupt wavy boundary.; moist when described; observed in pit, small

A—4 to 16 centimeters (1.6 to 6.3 inches); dark yellowish brown (10YR 4/4) broken face, yellowish brown (10YR 5/6) broken face, dry; loam; 22 percent clay; weak medium subangular blocky parts to weak fine granular structure; soft, firm, slightly sticky, slightly plastic; moderate permeability; 6.0 very fine roots and 2.0 medium roots and 6.0 fine roots; 6.0 very fine tubular and 6.0 very fine irregular and 3.0 medium tubular and 6.0 fine irregular and 6.0 fine tubular pores; 8 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog; abrupt wavy boundary. Lab sample # 10N03208; moist when described; observed in pit, small

AB—16 to 28 centimeters (6.3 to 11.0 inches); dark yellowish brown (10YR 4/4) broken face, yellowish brown (10YR 5/8) broken face, dry; loam; 22 percent clay; moderate medium subangular blocky parts to weak fine granular structure; slightly hard, firm, slightly sticky, slightly plastic; moderate permeability; 6.0 very fine roots and 2.0 medium roots and 6.0 fine roots and 1.0 coarse roots; 10.0 very fine tubular and 6.0 very fine irregular and 2.0 medium tubular and 10.0 fine tubular and 6.0 fine irregular and 2.0 coarse tubular pores; 8 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; slightly acid, pH 6.5, hellige-truog; abrupt wavy boundary. Lab sample # 10N03209; moist when described; observed in pit, small

BA—28 to 66 centimeters (11.0 to 26.0 inches); yellowish red (5YR 5/8) broken face, strong brown (7.5YR 5/8) broken face, dry; loam; 24 percent clay; weak medium subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 4.0 very fine roots and 4.0 medium roots and 4.0 fine roots; 6.0 very fine tubular and 6.0 very fine irregular and 2.0 medium tubular and 6.0 fine tubular and 6.0 fine irregular pores; 3 percent by volume nonflat subrounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; moderately acid, pH 6.0, hellige-truog; abrupt irregular boundary.; moist when described; observed in pit, small

Bt1—66 to 101 centimeters (26.0 to 39.8 inches); strong brown (7.5YR 4/6) broken face, strong brown (7.5YR 5/6) broken face, dry; clay loam; 28 percent clay; moderate coarse subangular blocky structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 4.0 very fine roots and 4.0 medium roots and 4.0 fine roots and 1.0 coarse roots; 4.0 very fine irregular and 6.0 very fine tubular and 1.0 medium tubular and 4.0 fine irregular and 6.0 fine tubular pores; 3 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; abrupt wavy boundary. Lab sample # 10N03210; moist when described; observed in pit, small

2Bt2—101 to 165 centimeters (39.8 to 65.0 inches); 50 percent red (2.5YR 4/8) broken face and 25 percent strong brown (7.5YR 5/8) broken face and 25 percent yellowish red (5YR 5/8) broken face, yellowish red (5YR 5/8) broken face, dry; loam; 26 percent clay; massive; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 1.0 very fine roots and 1.0 fine roots and 1.0 coarse roots; 1.0 very fine tubular pores; 2 percent faint yellowish brown (10YR 5/8), moist, clay films on rock fragments; 9 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; strongly acid, pH 5.5, hellige-truog; clear wavy boundary. Lab sample # 10N03211; moist when described; observed in pit, small

3BCt—165 to 204 centimeters (65.0 to 80.3 inches); 10YR 4/8 (10YR 4/8) broken face, light red (2.5YR 6/8) broken face, dry; gravelly sandy clay loam; 22 percent clay; massive; soft, very friable, slightly sticky, slightly plastic; moderate permeability; 0.5 very fine roots and 0.5 fine roots; 0.5 very fine tubular and 2.0 fine interstitial pores; 15 percent distinct strong brown (7.5YR 5/6), moist, clay films on surfaces along pores; 25 percent by volume nonflat rounded very strongly coherent cemented 2-38-75 millimeter mixed fragments; noneffervescent; very strongly acid, pH 5.0, hellige-truog. Lab sample # 10N03212; moist when described; observed in pit, small