IDENTIFIERS

Current Taxon Name (Soil Name): Andic Durixerepts

OSD

Series Extent

User Site ID: 07CA089003

User Pedon ID: 789229

Vegetation Plot ID: 07CA089003

Lab Information:

Certified Lab Pedon Description - yes

Lab Source ID - NSSL

Lab Pedon # - 08N0099

NCSS Pedon Lab Data NASIS Record ID - 19527

Print Date: 12/10/2025

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: 40.4898333

Std. Longitude: -121.4285278

Datum: WGS84

Township: 30 N

Range: 5 E

Section: 4

PLSS Details: approximately 2000 feet west and 2500 feet north of the southeast corner

Location Description: About .25 miles southwest of Summit Lake

Map Unit: 143—Andic Durixerepts gravelly ashy loamy coarse sand, 3 to 20 percent slopes

State: California

County: CA089—Shasta

MLRA: 22B—Southern Cascade Mountains

Non-MLRA Soil Survey Area: CA789—Lassen Volcanic National Park, California

7.5 Minute USGS Quad: 40121-D4—Reading Peak, California

PEDON

Describers Name: AEC, JKA

Current Taxonomic Class: Ashy-skeletal, amorphic, frigid Andic Durixerepts

Current Taxon Kind: taxon above family

Pedon Type: TUD pedon

Pedon Purpose: full pedon description

Pedon Record Orgin: NASIS

Correlated Information:

Soil Name - Andic Durixerepts

Classificaton Date - 4/21/2010

Soil Taxonomic Edition - tenth edition

Moisture Class - xeric

Moisture Subclass - typic

Sampled As Information:

Soil Name - Andic Durixerepts, high outwash terrace

Classificaton Date - 6/7/2007

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Parent Material: tephra derived from volcanic rock over outwash derived from volcanic rock

Landscape: mountains

Landform: high outwash terrace

Geomorphic Component Terraces: tread

Hill Slope Profile: summit

Slope Shape Across: convex

Slope Shape Down: convex

Drainage Class: well

Geology: Qty member.

Surface Fragments: 8.00 percent nonflat subangular 2- to 75-millimeter volcanic, unspecified, 3.00 percent nonflat subangular 250- to 600-millimeter volcanic, unspecified, 3.00 percent nonflat subangular 600 volcanic, unspecified, 3.00 percent nonflat subangular 75- to 250-millimeter volcanic, unspecified,

Benchmark Soil?: no

VEGETATION

Ecological Sites. (Click Ecological Site ID For Link to EDIT.)
Ecological Site ID	Ecological Site Name	Correlation Data	Classifier
F022BI115CA	Frigid And Cryic Gravelly Slopes

SITE OBSERVATION

Observation Date: 6/7/2007 (actual site observation date)

Surface Cover Properties:

Site Obs. Cover Kind 1 - tree cover

Site Obs. Cover Kind 2 - native shrubs

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
ABMA ARNE PIMO3	Abies magnifica Arctostaphylos nevadensis Pinus monticola	California red fir pinemat manzanita western white pine	— — —	— — —	— — —

Pedon Restrictions
Kind	Hardness	Restriction Depth L-H	Restriction Thickness L-RV-H
		cm
duripan	—	60 -	—

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
—	—	—-

Site Soil Temperature
Site Obs. Date	Depth	Sensor Kind	Temperature
	cm		C
6/7/2007	50	—	7

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
7	—	—	2075.7	—	80	1600	—	—	4.9	—	—	—	—	—	—	—	—	—	—

Oi—0 to 2 centimeters (0.0 to 0.8 inches); slightly decomposed plant material; mottles; ; ; ; fragments; abrupt smooth boundary.; slightly moist when described; observed in pit, small

A—2 to 8 centimeters (0.8 to 3.1 inches); light brownish gray (10YR 6/2), very dark grayish brown (10YR 3/2), moist; gravelly sandy loam; 8 percent clay; mottles; weak fine and medium subangular blocky parts to single grain; soft, very friable, nonsticky, nonplastic; 3.0 very fine and fine roots; 8.0 very fine and fine interstitial pores; ; ; ; 10 percent by volume nonflat subangular 5-12-20 millimeter volcanic, unspecified fragments and 15 percent by volume nonflat subangular 2-3-5 millimeter volcanic, unspecified fragments; slightly acid, pH 6.3, hellige-truog; abrupt smooth boundary.; slightly moist when described; observed in pit, small

2Bw1—8 to 31 centimeters (3.1 to 12.2 inches); pale brown (10YR 6/3), brown (10YR 4/3), moist; extremely cobbly sandy loam; 9 percent clay; mottles; weak very fine and fine subangular blocky structure; soft, very friable, nonsticky, nonplastic; 3.0 very fine and fine roots throughout and 3.0 very coarse roots throughout and 8.0 medium and coarse roots throughout; 8.0 very fine and fine tubular and 8.0 very fine and fine irregular pores; ; ; ; 14 percent by volume nonflat subangular 2-3-5 millimeter volcanic, unspecified fragments and 25 percent by volume nonflat subangular 5-40-75 millimeter volcanic, unspecified fragments and 30 percent by volume nonflat subangular 75-163-250 millimeter volcanic, unspecified fragments; slightly acid, pH 6.5, hellige-truog; clear smooth boundary.; slightly moist when described; observed in pit, small

2Bw2—31 to 49 centimeters (12.2 to 19.3 inches); very pale brown (10YR 7/3), brown (10YR 4/3), moist; extremely gravelly sandy loam; 6 percent clay; mottles; weak very fine and fine subangular blocky, and weak medium subangular blocky structure; soft, very friable, nonsticky, nonplastic; 3.0 very fine and fine roots throughout and 0.8 very coarse roots throughout and 0.8 medium and coarse roots throughout; 8.0 very fine and fine tubular and 8.0 very fine and fine irregular pores; ; ; ; 12 percent by volume nonflat subangular 2-3-5 millimeter volcanic, unspecified fragments and 20 percent by volume nonflat subangular 75-163-250 millimeter volcanic, unspecified fragments and 32 percent by volume nonflat subangular 5-40-75 millimeter volcanic, unspecified fragments; neutral, pH 6.7, hellige-truog; abrupt smooth boundary.; slightly moist when described; observed in pit, small

2Bq—49 to 60 centimeters (19.3 to 23.6 inches); very pale brown (10YR 7/3), brown (10YR 4/3), moist; extremely gravelly loamy coarse sand; 4 percent clay; mottles; massive; loose, loose, nonsticky, nonplastic; 0.8 very fine to coarse roots throughout and 0.8 very coarse roots throughout; 8.0 very fine and fine interstitial and 3.0 very fine and fine tubular pores; ; ; 15 percent threadlike silica masses around rock fragments; 10 percent by volume nonflat subangular 75-163-250 millimeter volcanic, unspecified fragments and 30 percent by volume nonflat subangular 5-40-75 millimeter volcanic, unspecified fragments and 30 percent by volume nonflat subangular 2-3-5 millimeter volcanic, unspecified fragments; neutral, pH 7.0, hellige-truog; abrupt irregular boundary.; dry when described; observed in pit, small

2Bqm—60 centimeters (23.6 inches); white (2.5Y 8/1), grayish brown (2.5Y 5/2), moist; cemented extremely gravelly loamy coarse sand; 2 percent clay; mottles; moderate medium platy, and moderate thick platy structure; extremely hard, slightly rigid, strongly coherent, nonsticky, nonplastic; 3.0 very fine and fine tubular and 8.0 very fine and fine interstitial pores; ; ; 15 percent threadlike silica masses on horizontal faces of peds; 5 percent by volume nonflat subangular 75-163-250 millimeter volcanic, unspecified fragments and 30 percent by volume nonflat subangular 5-40-75 millimeter volcanic, unspecified fragments and 30 percent by volume nonflat subangular 2-3-5 millimeter volcanic, unspecified fragments; neutral, pH 7.2, hellige-truog.; dry when described; observed in pit, small