VOLCANIC AND ASSOCIATED ROCKS (WRANGELL LAVA)
Alluvium along streams and in fans (Holocene)—Mainly in active flood plains and lowermost terraces of major and some minor streams and in larger active fans. Larger fan margins are outlined by fine dots. Chiefly stratified silt, sand, gravel, and boulders Older alluvium (Holocene and Pleistocene)—Ma...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Text |
| Language: | English |
| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.688.5560 http://pubs.usgs.gov/imap/i-2695/i-2695so.pdf |
| Summary: | Alluvium along streams and in fans (Holocene)—Mainly in active flood plains and lowermost terraces of major and some minor streams and in larger active fans. Larger fan margins are outlined by fine dots. Chiefly stratified silt, sand, gravel, and boulders Older alluvium (Holocene and Pleistocene)—Mainly outwash related to Alaskan glaciation and possibly younger phase of Wisconsin glaciation. Chiefly stratified silt, sand, gravel, and boulders Colluvium, undifferentiated (Holocene and Pleistocene)—Chiefly talus, but also includes deposits of small landslides, rock glaciers, other products of mass-wasting processes, and alluvium in small fans and cones. Chiefly poorly sorted silt, sand, gravel, and boulders Landslide deposits (Holocene and Pleistocene)—Includes large slump and debris avalanche deposits. Particularly common along steep north flank of mountain escarpment south of Beaver Creek. Slump deposits consist chiefly of masses of volcanic rock as much as hundreds of meters wide; debris deposits are chiefly diamicton and rubble Solifluction deposits (Holocene and Pleistocene)—Deposits on low-angle, low-relief slopes at relatively high elevations. Mostly bedrock rubble but may include some Wisconsin and older glacial drift Rock glacier deposits (Holocene)—Deposits of active rock glaciers exhibiting well-defined lobate forms. Chiefly angular blocks and diamicton Alaskan glaciation deposits (Holocene)—Terminal and lateral moraine at base of small ice field in sec. 34, T. 2 N., R. 22 E. Chiefly diamicton Younger Wisconsin glaciation deposits (Pleistocene)—Terminal and lateral moraines of late(?) phase of Wisconsin glaciation. Chiefly diamicton and rubble Older Wisconsin glaciation deposits (Pleistocene)—Chiefly ground moraine of main(?) phase of Wisconsin glaciation. Diamicton, local gravel and sand Fluvio-glacial deposits (Pleistocene)—Chiefly outwash related to main(?) phase of Wisconsin glaciation. Silt, sand, gravel, and boulders |
|---|