Distinctive sedimentary features of cold-climate eolian deposits, North Park, Colorado
Palaeogeography, Palaeoclimatology, Palaeoecology
By: Thomas S. Ahlbrandt and S. Andrews
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Abstract
Cold-climate eolianites contain diagnostic sedimentary features that contrast with the sedimentary features of warm-climate eolianites. Distinctive tensional, compressional, and dissipation sedimentary structures related to freezing, thawing and snow melting characterize eolian dune-sand deposits in North Park, Colorado. The North Park dunes have few of the characteristics considered to be diagnostic eolian indicators. A significant difference is the heterogeneous texture and composition of the sand. The migration rate of these active dunes is slow (???1.7 m/year) due to freezing of moisture in the sand or to burial of the sand by snow during half of the year, even though the dunes occur in a unimodal, high-energy wind environment. Bioturbation is common in both active and inactive dunes, although the dunes occur at a high elevation ({reversed tilde} 2500m) in a cold climate (3.0??C mean annual temperature). The distinctive sedimentary features observed in this cold-climate (snow-related) dune field should aid in the interpretation of eolianites and the paleoclimates in which they formed. ?? 1978.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Distinctive sedimentary features of cold-climate eolian deposits, North Park, Colorado |
| Series title | Palaeogeography, Palaeoclimatology, Palaeoecology |
| DOI | 10.1016/0031-0182(78)90048-2 |
| Volume | 25 |
| Issue | 4 |
| Year Published | 1978 |
| Language | English |
| Publisher | Elsevier |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Palaeogeography, Palaeoclimatology, Palaeoecology |
| First page | 327 |
| Last page | 351 |
| Google Analytic Metrics | Metrics page |