IDENTIFIERS

Current Taxon Name (Soil Name): Dolason

OSD

Series Extent

User Site ID: S1978CA605REDW001

User Pedon ID: S10CA023002

Vegetation Plot ID: S1978CA605REDW001

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - SSL

Lab Pedon # - 10N0673

NCSS Pedon Lab Data NASIS Record ID - 43141

Print Date: 4/28/2025

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: 41.2016937

Std. Longitude: -123.9517783

Datum: WGS84

Location Description: Redwood National Park, Humboldt County, California; about 90 meters sw of K & K road from junction with unnamed road

Map Unit: 482—Dolason-Countshill complex, 30 to 50 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: 41123-B8—Bald Hills, California

PEDON

Describers Name: Bruce Gordon & Jum Popenoe

Current Taxonomic Class: Fine-loamy, mixed, superactive, mesic Xeric Haplohumults

Current Taxon Kind: taxadjunct

Pedon Type: taxadjunct to the series

Pedon Purpose: full pedon description

Pedon Record Orgin: NASIS

Pedon #: 2

Sampled As Information:

Soil Name - Dolason

Taxonomic Class - Fine-loamy, mixed, superactive, mesic Xeric Haplohumults

PSC - 62 to 112 cm.

Classificaton Date - 11/14/1978

Soil Taxonomic Edition - tenth edition

Moisture Class - xeric

Moisture SUBClass - typic

Dynamic Soil Properties:

Erosion Class - 0

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Parent Material: colluvium and residuum derived from sandstone and shale

Landscape: mountains

Landform: mountain slope

Geomorphic Component Mountains: mountainflank

Hill Slope Profile: backslope

Slope Complexity: simple

Slope Shape Across: convex

Slope Shape Down: convex

Runoff: high

Drainage Class: well

Flooding: none flooding

Ponding: none ponding

Bedrock: sandstone and shale

Geology: Franciscan Formation formation.

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 11/14/1978 (actual site observation date)

Surface Water Kind: none observed

Plant Association Name: prairie

Surface Cover Properties:

Site Obs. Cover Kind 1 - grass/herbaceous cover

Site Obs. Cover Kind 2 - rangeland, grassland

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
ANAR7 HYRA3 LINUM LOTUS RUAC3	Anthoxanthum aristatum Hypochaeris radicata Linum Lotus Rumex acetosella	annual vernalgrass hairy cat's ear flax trefoil common sheep sorrel	— — — — —	— — — — —	— — — — —

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
umbric epipedon argillic horizon	0—62 62—222	—62— —160—

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
25	—	—	690	—	270	2150	—	240	13	18	7	—	—	—	—	—	—	—	—

A1—0 to 13 centimeters (0.0 to 5.1 inches); very dark grayish brown (10YR 3/2) broken face, grayish brown (10YR 5/2) broken face, dry; loam; 20 percent clay; strong fine granular, and strong very fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 3.0 very fine roots and 1.0 fine roots; 3.0 very fine irregular and 1.0 medium tubular and 3.0 fine irregular and 1.0 coarse tubular pores; 3 percent by volume nonflat subangular indurated 2-38-75 millimeter sandstone, unspecified fragments; noneffervescent; very strongly acid, pH 4.7, bromcresol green; clear wavy boundary. Lab sample # 10N03078; moist when described; observed in pit, small

A2—13 to 62 centimeters (5.1 to 24.4 inches); very dark grayish brown (10YR 3/2) broken face, grayish brown (10YR 5/2) broken face, dry; loam; 21 percent clay; moderate very fine granular, and moderate fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; moderate permeability; 2.0 very fine roots and 1.0 fine roots; 3.0 very fine irregular and 1.0 medium tubular and 1.0 fine tubular and 3.0 fine irregular and 1.0 coarse tubular pores; 3 percent by volume nonflat subangular indurated 2-38-75 millimeter sandstone, unspecified fragments; noneffervescent; very strongly acid, pH 4.7, bromcresol green; diffuse wavy boundary. Lab sample # 10N03079; moist when described; observed in pit, small

BAt—62 to 87 centimeters (24.4 to 34.3 inches); dark grayish brown (10YR 4/2) broken face, brown (10YR 5/3) broken face, dry; clay loam; 31 percent clay; moderate very fine granular, and moderate fine granular structure; slightly hard, friable, slightly sticky, slightly plastic; moderately slow permeability; 2.0 very fine roots; 2.0 very fine irregular and 1.0 fine irregular pores; 15 percent distinct clay films on all faces of peds; 7 percent by volume nonflat subangular indurated 2-38-75 millimeter sandstone, unspecified fragments; noneffervescent; very strongly acid, pH 4.7, bromcresol green; clear irregular boundary. Lab sample # 10N03080; moist when described; observed in pit, small

Bt1—87 to 106 centimeters (34.3 to 41.7 inches); dark yellowish brown (10YR 4/4) broken face, light yellowish brown (10YR 6/4) broken face, dry; gravelly clay loam; 33 percent clay; moderate very fine granular, and moderate fine granular, and moderate medium subangular blocky, and moderate fine subangular blocky structure; slightly hard, friable, moderately sticky, moderately plastic; moderately slow permeability; 1.0 very fine roots; 2.0 very fine irregular and 1.0 medium tubular and 1.0 fine irregular and 1.0 fine tubular pores; 15 percent distinct clay films on all faces of peds; 18 percent by volume nonflat subangular indurated 2-38-75 millimeter sandstone, unspecified fragments; noneffervescent; very strongly acid, pH 5.0, bromcresol green; clear irregular boundary. Lab sample # 10N03081; moist when described; observed in pit, small

Bt2—106 to 154 centimeters (41.7 to 60.6 inches); strong brown (7.5YR 5/6) broken face, reddish yellow (7.5YR 6/6) broken face, dry; clay; 47 percent clay; moderate very fine granular, and moderate fine granular structure; hard, firm, moderately sticky, moderately plastic; moderately slow permeability; 1.0 very fine roots; 2.0 very fine irregular and 1.0 medium tubular and 1.0 fine irregular and 1.0 fine tubular pores; 15 percent distinct clay films on all faces of peds; fragments; noneffervescent; strongly acid, pH 5.2, bromcresol green; diffuse wavy boundary. Lab sample # 10N03082; moist when described; observed in pit, small

Bt3—154 to 222 centimeters (60.6 to 87.4 inches); strong brown (7.5YR 5/6) broken face, reddish yellow (7.5YR 6/6) broken face, dry; clay; 45 percent clay; massive; hard, firm, moderately sticky, moderately plastic; moderately slow permeability; 0.5 very fine roots; 2.0 very fine irregular and 1.0 fine irregular pores; 15 percent distinct clay films on all faces of peds; fragments; noneffervescent; strongly acid, pH 5.2, bromcresol green.; moist when described; observed in pit, small