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 geologic map of the Shaktoolik area, Norton Bay Quadrangle, Alaska

This 1:50,000 scale geologic map describes the distribution of unconsolidated deposits, identifies local geologic hazards, and provides information about the depositional environment and basic engineering properties of common surficial-geologic materials in and around Shaktoolik, Alaska. Map units are the result of combined field observations and aerial imagery interpretation. A suite of local ground observations were collected over a two-week period in July 2011 by a helicopter-supported team of DGGS geologists and collaborators. Field investigations included soil test pits, sample collection, soil and rock description, oblique aerial photography, and documentation of landscape morphology.

Tags: Alluvial, Alluvium, Analyses and Sampling, C14, Clay, All tags... Coastal, Coastal and River, Colluvium, Conglomerate, Construction Materials, Engineering, Engineering Geology, Eolian, Erosion, Fan, Flood, Floodplain, Fluvial, Gelifluction, Geochronology, Geologic, Geologic Hazards, Geologic Map, Geology, Geomorphology, Geotechnical, Gravel, Hazards, Ice, Image Interpretation, Interpretation, Inundation, Lacustrine, Lakes, Meltwater, Norton Bay Quadrangle, Permafrost, Permafrost and Periglacial, Resource Assessment, Resources, Rocks, Sand, Sand and Gravel, Sediment, Sedimentation, Shaktoolik, Silt, Slope, Slump, Surface, Surficial, Surficial Geologic Map, Surficial Geology, Terrace, Thaw Lakes, Thawing Permafrost, Thermokarst, geoscientificInformation, Fewer tags

Storage and release of solutes from a subalpine seasonal snowpack: soil and stream water response, Niwot Ridge, Colorado

Much of the research on the chemistry of snow and surface waters of the western US, Europe, and Asia has been conducted in high-elevation catchments above treeline. Here we provide information on the solute content of the seasonal snowpack at the Soddie site on Niwot Ridge, Colorado, a subalpine site near treeline. We focus on the storage and release of both inorganic and organic solutes to the soils underneath the snowpack, and subsequent effects on the chemical and nutrient content of the underlying soil solution and the adjacent headwater stream. The concentration of inorganic nitrogen (N) stored in the seasonal snowpack at the Soddie site of about 11 μeq L−1 was on the upper end of values reported...

Categories: Publication; Types: Citation, Journal Citation; Tags: Biogeochemistry, Chemistry, Isotopes, Lysimeter, Meltwater, All tags... Snow, Soil solution, Springer, Surface water, Fewer tags