A Guide to the Late Quaternary History of Northern and Western Kenai Peninsula, Alaska

Between 27 and 11 kyr ago, during the last major (Naptowne) glaciation, the northwestern and western Kenai Peninsula and the Cook Inlet trough were covered by ice except for local nunataks and small refugia, like the Caribou Hills. Landforms related to four glacial stades are recognized and paleogeographic maps document ice limits, drainage systems, glacial-impounded lakes, and glaciomarine terraces. Numerous multidisciplinary studies of glacial, vegetation, and insect histories document Holocene climatic changes.

Tags: Alluvial Deposits, Climate Change, Coastal Erosion, Cook Inlet, Erosion, All tags... Geologic Hazards, Geology, Geomorphology, Glacial Deposits, Glacial Drift, Glacial Geology, Glaciation, Gravel, Homer, Ice, Ice Contact Deposits, Ice-Contact, Kenai Peninsula, Kenai Quadrangle, Kenai Spur Highway, Meltwater, Outwash, Radiocarbon Dating, Seldovia Quadrangle, Seward Highway, Seward Quadrangle, Sterling Highway, Surficial Geology, Tephra, Tephrachronology, Terrace, Tsunami, Vegetation, geoscientificInformation, Fewer tags

Surficial geology of the Dalton Highway (Itkillik-Sagavanirktok rivers) area, southern Arctic foothills, Alaska

This report provides detailed (1:63,360-scale) surficial-geologic mapping in the Dalton Highway area, from the Sagavanirktok to the Itkillik Rivers, in the west-central Philip Smith Mountains quadrangle. The map area extends from the northern flank of the Endicott Mountains into the Arctic Foothills province.

Tags: Alaska, State of, Alluvial, Atigun Gorge, Atigun River, Aufeis, All tags... Avalanche, Beach Deposits, Brooks Range, Colluvial Deposits, Correlation, Dalton Highway, Drainage Patterns, Dunes, Endicott Mountains, Eolian, Erratics, Esker, Fan, Floodplain, Fluvial, Galbraith Lake, Geologic Map, Glacial, Glacial Drift, Glacial Lake, Glaciation, Glaciers, Gravel, Ice Contact Deposits, Imnavait Mountain, Interglaciation, Itigaknit Mountain, Itkillik River, Kettles, Kuparuk River, Lacustrine, Landslide, Levees, Loess, Moraines, Outwash, Paleosols, Peat, Permafrost, Philip Smith Mountains Quadrangle, Piracy, Radiocarbon Dating, Reference Information, Rock Glaciers, STATEMAP Project, Sagavanirktok River, Sand, Silt, Slope Mountain, Solifluction, Stratigraphy, Surficial, Talus, Tectonics, Terrace, Toolik Lake, Toolik River, Trans-Alaska Pipeline, Tundra, Vegetation, geoscientificInformation, Fewer tags

Geologic map of the Talkeetna Mountains C-4 Quadrangle and adjoining areas, central Alaska

The Alaska Division of Geological & Geophysical Surveys (DGGS), in partnership with the U.S. National Cooperative Geologic Mapping Program, mapped approximately 450 mi2 of the Talkeetna Mountains region of central Alaska at 1:50,000 scale over the course of six weeks in 2014. This area contains significant exposures of Late Triassic mafic volcanics and gabbro sills that have been the focus of region-wide exploration for the Strategic and Critical platinum-group elements (PGEs). The area also exposes numerous inactive and possibly active faults which project through the area of proposed hydropower development. The resulting geologic map offers an improved understanding of the geology, structural history, and mineral...

Tags: 40Ar/39Ar, Aerial Geology, Aerial Photography, Alluvial, Alluvial Deposits, All tags... Amphibolite Facies Units, Bedrock Geologic Map, Bedrock Geology, Brachiopods, Cleary Creek, Colluvial Deposits, Cordilleran Ice Sheet, Crinoids, Esker, Faulting, Faults, Floodplain, Fluvial, Fossils, Geochronology, Geologic Map, Geologic Materials, Geomorphology, Glacial, Glacial Deposits, Glacial Drift, Glacial Geology, Glacial Geomorphology, Glacial History, Glacial Lake, Glacial Processes, Glacial Stratigraphy, Glaciation, Ice Contact Deposits, Ice-Contact, Iron Creek, Lacustrine, Lacustrine Sedimentation, Landslide, Landslide Deposit, Outwash, Outwash Fan, Paleochannel, Permafrost and Periglacial, Remote Sensing, Rock Glaciers, Rock-Glacier Deposits, Rockfall, STATEMAP Project, Sand and Gravel, Slides, Slope Instability, Soil Creep, Stephan Lake, Surficial, Surficial Geologic Map, Surficial Geology, Talkeetna Mountains, Talkeetna Mountains Quadrangle, Talkeetna River, Till, geoscientificInformation, Fewer tags

Surficial-geologic map, Alaska Highway corridor, Delta Junction to Dot Lake, Alaska

During 2006 and 2007 the Alaska Division of Geological & Geophysical Surveys conducted reconnaissance surficial-geologic mapping in segment 1 of the Alaska Highway corridor, which straddles the Alaska Highway through the Tanana River valley from Delta Junction to the eastern boundary of the Mt. Hayes Quadrangle. Surficial-geologic deposits were initially mapped by interpreting ~1:63,360-scale, false-color infrared aerial photographs taken in August 1980 and field verified in 2006-2007.

Tags: Age Dates, Alaska Highway Corridor, Alluvial Deposits, Alluvial Fan, Alluvium, All tags... Big Delta, Big Delta Quadrangle, C14, Colluvial Deposits, Colluvium, Delta Junction, Delta River, Depositional Environment, Dot Lake, Dunes, Eolian, Erosion, Erratics, Esker, Faults, Floodplain, Floods, Gasline, Geologic Hazards, Geologic Map, Geologic Materials, Geomorphology, Glacial Deposits, Glacial Drift, Glacial Geology, Glacial Hazards, Glacial Lake, Glacial Processes, Gravel, Ice Contact Deposits, Jokulhlaups, Lake George, Lake Level, Landslide, Measured Sections, Mount Hayes Quadrangle, Outburst Floods, Outwash, Paleoenvironment, Paleosols, Paludal, Peat, Permafrost, Proposed Natural Gas Pipeline, Radiocarbon Dating, Rock Glaciers, Sand, Soil, Soils, Surficial, Surficial Geology, Talus, Tanana River, Terrace, Thaw Lakes, Transportation Corridor, Unconsolidated Deposits, Water Table, Fewer tags