Document Outline - Accessibility Statement
- Cover
- How to Use This Soil Survey
- Contents
- Preface
- Introduction
- General Nature of the Survey Area
- History and Development
- Natural Resources
- Climate
- Physiography
- Geology
- Vegetation
- How this Survey was Made
- General Soil Map Units
- F. Soils on Stream Flood Plains, Terraces, and Alluvial Fans
- G. Soils Underlain by Granitic Bedrock, Warm
- AG. Soils Underlain by Granitic and Rhyolitic Bedrock, Cool
- B. Soils Underlain by Metasedimentary and Basaltic Rocks, Warm
- AB. Soils Underlain by Metasedimentary and Basaltic Rocks, Cool
- L. Soils Underlain by Limestone
- Soil Series and Detailed Soil Map Units
- 12A-Typic Cryoboralfs, till substratum
- 12B-Typic Cryochrepts and Typic Cryoboralfs, till substratum, hilly
- 12C-Andic Cryochrepts, moraines
- 12D-Typic Cryoboralfs, moderately coarse-textured till substratum
- 13A-Typic Cryoboralfs, medium-textured and moderately fine-textured till substratum
- 14-Typic Cryochrepts, colluvial deposits
- 14A-Argic Cryoborolls, colluvial slopes
- 14B-Typic Cryoboralfs, colluvial basins and toeslopes
- 14C-Typic Cryochrepts, colluvial toeslopes and basins
- 15-Mollic Cryoboralfs, landslides
- 15C-Typic Eutroboralfs, landslides
- 21-Lithic Ustochrepts-Typic Ustochrepts complex, limestone substratum
- 22-Lithic Ustochrepts, limestone substratum
- 26-Typic Ustochrepts-Mollic Eutroboralfs complex, bouldery, granitic substratum
- 29-Lithic Ustochrepts, mountain slopes
- 29A-Lithic Ustochrepts-Typic Ustochrepts complex, structural benches
- 29B-Typic Ustochrepts, structural benches
- 29C-Lithic Argiborolls, rolling uplands
- 31-Typic Ustochrepts and Typic Calciborolls, limestone substratum
- 32-Mollic Cryoboralfs-Calcic Cryoborolls complex, dip slopes
- 32A-Calcic Cryoborolls, dip slopes
- 32B-Typic Cryochrepts-Lithic Cryochrepts- Rock outcrop complex, dip slopes
- 34-Typic Cryochrepts-Typic Cryoboralfs complex, mountain slopes
- 36-Typic Cryoboralfs, bouldery, granitic substratum
- 36A-Argic Cryoborolls, granitic substratum
- 36B-Typic Cryoboralfs-Aquolls complex, granitic substratum
- 37-Argic Cryoborolls-Lithic Cryoborolls complex, basaltic substratum
- 39-Typic Ustochrepts, steep
- 39A-Lithic Cryoborolls-Argic Cryoborolls complex, mountain slopes
- 39B-Lithic Ustochrepts-Typic Ustochrepts complex, steep
- 39C-Argic Cryoborolls, mountain ridges, dry
- 41-Typic Cryochrepts and Calcic Cryoborolls, steep, cool
- 44-Typic Cryochrepts, steep
- 46-Typic Cryorthents, extremely bouldery
- 47-Typic Cryoboralfs and Mollic Cryoboralfs, basaltic substratum
- 47B-Typic Cryoboralfs, basaltic substratum, cool
- 48-Dystric Cryochrepts, rhyolitic substratum
- 49-Typic Cryoboralfs and Mollic Cryoboralfs, steep
- 49A-Argic Cryoborolls, mountain ridges
- 49B-Typic Cryoboralfs-Typic Cryochrepts complex, mountain slopes
- 51-Lithic Cryochrepts-Rock outcrop complex, limestone substratum
- 54-Lithic Cryoborolls, mountain ridges
- 56-Typic Cryochrepts-Lithic Cryochrepts- Rock outcrop complex, bouldery, granitic substratum
- 56A-Typic Cryochrepts-Rubble land complex, steep
- 57-Typic Cryochrepts-Rubble land complex, basaltic substratum
- 57A-Typic Cryochrepts-Rubble land complex, basaltic substratum, cold
- 58-Andic Cryochrepts, rhyolitic substratum
- 59-Typic Cryochrepts, channery-Typic Cryochrepts, extremely cobbly, complex mountain ridges
- 59A-Andic Cryochrepts, mountain ridges
- 59B-Typic Cryochrepts-Rock outcrop complex, mountain slopes
- 69-Typic Cryumbrepts, mountain ridges
- 76-Typic Cryochrepts, bouldery, granitic substratum, steep
- 76A-Typic Cryochrepts, bouldery, granitic substratum
- 77-Typic Cryochrepts-Lithic Cryochrepts complex, mountain ridges
- 77A-Argic Cryoborolls-Lithic Cryoborolls complex, basaltic substratum, mountain ridges
- 77B-Typic Cryochrepts, basaltic substratum, steep
- 79-Typic Cryochrepts, mountain slopes, metasedimentary substratum
- 79B-Typic Cryoboralfs-Typic Cryochrepts complex, structural benches
- 80-Cirqueland
- 86-Typic Ustochrepts-Rock outcrop complex, glacial trough walls, granitic substratum
- 87-Typic Ustochrepts-Rock outcrop complex, glacial trough walls
- 89-Typic Cryochrepts-Rock outcrop complex, glacial trough walls, granitic substratum
- 90-Andic Cryochrepts-Typic Cryoboralfs complex, glacial trough walls
- 91-Rock outcrop
- 92-Typic Ustochrepts-Rock outcrop complex, limestone substratum
- 94-Lithic Ustochrepts-Rock outcrop complex, metasedimentary substratum
- 94A-Lithic Cryochrepts-Rock outcrop complex, structural breaklands
- 95-Typic Cryochrepts-Lithic Cryochrepts- Rock outcrop complex, limestone substratum
- 97-Typic Cryochrepts, structural breaklands
- 100-Borolls, flood plains and terraces
- 101-Aquolls, flood plains and terraces
- 110-Typic Argiborolls and Typic Ustochrepts, alluvial fans
- 120-Typic Cryoboralfs-Typic Cryochrepts complex, granitic substratum
- 130-Typic Cryoboralfs-Argic Cryoborolls complex, moraines
- 136-Aquolls-Typic Cryochrepts complex, moraines
- 150-Argic Cryoborolls-Mollic Cryoboralfs complex, landslides
- 210-Lithic Ustochrepts-Typic Ustochrepts complex, mountain slopes
- 260-Typic Haploborolls-Typic Ustochrepts complex, bouldery, granitic substratum
- 290-Lithic Ustochrepts-Typic Ustochrepts complex, metasedimentary substratum
- 320-Calcic Cryoborolls-Mollic Cryoboralfs complex, limestone substratum
- 360-Typic Cryoboralfs-Argic Cryoborolls complex, bouldery, granitic substratum
- 380-Typic Eutroboralfs-Typic Argiborolls complex, mountain slopes
- 381-Typic Cryoboralfs, mountain slopes, steep
- 390-Typic Haploborolls-Typic Eutroboralfs complex, mountain slopes
- 391-Argic Cryoborolls-Mollic Cryoboralfs complex, mountain ridges, dry
- 392-Typic Ustochrepts-Typic Cryochrepts complex, mountain slopes
- 470-Typic Cryoboralfs-Argic Cryoborolls complex, mountain ridges
- 480-Typic Cryoboralfs, mountain slopes
- 490-Argic Cryoborolls-Mollic Cryoboralfs complex, mountain ridges
- 790-Typic Cryochrepts-Typic Cryoboralfs complex, glaciated mountain slopes
- 791-Andic Cryochrepts-Rock outcrop complex, cirque basins
- Use and Management of the Soils
- Timber
- Range
- Roads
- Watershed
- Wilderness
- Fire Management
- Minerals
- Wildlife
- Recreation
- Visual Quality
- Classification of the Soils
- Aquolls
- Boralfs
- Borolls
- Ochrepts
- Orthents
- Umbrepts
- Soil Formation
- References
- Glossary
- Illustrations
- Cover
- Figure 1.—Location of Helena National Forest Area, Montana
- Figure 2.—Physiographic features of the Helena National Forest Area
- Figure 3.—Stream bottoms are flood plains, terraces, and alluvial fans in narrow mountain valleys.
- Figure 4.—A landslide deposit resulting from an earthflow
- Figure 5.—A hummocky and hilly moraine
- Figure 6.—An area of kames and kettles
- Figure 7.—Glacial trough walls in a U-shaped valley
- Figure 8.—Glacial cirques have very steep headwalls and a basin that often contains a small lake.
- Figure 9.—Glaciated mountain slopes are mantled by glacial till.
- Figure 10.—The dip of underlying rock layers is roughly perpendicular to the slope of structural breaklands.
- Detailed Soil Maps (Index to Map Sheets)
- General Soil Map
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