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• W2009494044 abstract "Research Article| August 01, 1967 Nonsorted Steps in the Mt. Kosciusko Area, Australia A. B COSTIN; A. B COSTIN CSIRO1 Division of Plant Industry, Canberra, Australia 1Commonwealth Scientific and Industrial Research Organization Search for other works by this author on: GSW Google Scholar B. G THOM; B. G THOM Coastal Studies Institute, Louisiana State University, Baton Rouge, Louisiana Search for other works by this author on: GSW Google Scholar D. J WIMBUSH; D. J WIMBUSH CSIRO Division of Plant Industry, Canberra, Australia Search for other works by this author on: GSW Google Scholar MINZE STUIVER MINZE STUIVER Radiocarbon Laboratory, Yale University, New Haven, Connecticut Search for other works by this author on: GSW Google Scholar Author and Article Information A. B COSTIN 1Commonwealth Scientific and Industrial Research Organization CSIRO1 Division of Plant Industry, Canberra, Australia B. G THOM Coastal Studies Institute, Louisiana State University, Baton Rouge, Louisiana D. J WIMBUSH CSIRO Division of Plant Industry, Canberra, Australia MINZE STUIVER Radiocarbon Laboratory, Yale University, New Haven, Connecticut Publisher: Geological Society of America Received: 09 May 1966 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1967, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1967) 78 (8): 979–992. https://doi.org/10.1130/0016-7606(1967)78[979:NSITMK]2.0.CO;2 Article history Received: 09 May 1966 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A. B COSTIN, B. G THOM, D. J WIMBUSH, MINZE STUIVER; Nonsorted Steps in the Mt. Kosciusko Area, Australia. GSA Bulletin 1967;; 78 (8): 979–992. doi: https://doi.org/10.1130/0016-7606(1967)78[979:NSITMK]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Mt. Kosciusko area of Australia contains a variety of soil and landscape features attributed to periglacial conditions. Among the features are several types of solifluction terraces, one of which is the nonsorted step. The steps occur in groups restricted to the tops of wind-exposed slopes of metasediment outcrops. The slopes range in declivity from 4 to 25 degrees and the vegetation is a mosaic of alpine herbfield and fjaeldmark (dwarf open heath).Nonsorted steps are more often lobate (width > length) than tongue-shaped (length > width), with 10–77-foot widths, 9–46-foot lengths, and risers up to 3 feet high. They consist of stony soil, a poorly sorted mass of silt to small stones, which overlies a layer of tabular rock fragments, up to 18 inches long and oriented downslope. This stony layer grades downward into fractured phyllite, schist, and slate with nearly vertical dip and cleavage. Between the stony soil and stony layer within several of the steps is an organically rich lens of stone-free soil.Radiocarbon analyses of this material indicate that steps 50–400 feet below the mountain crests are 2000–3000 years old and that further upslope, within 50 feet of the crests, episodic movement occurred during the last 300 years. Botanical and microtopographic data also support the view that downslope steps are relict features, whereas closer to the crests increased activity is apparent. Mass movement of an entire step requires the perennial or seasonal impedance of subsoil drainage, which permits the soils' frost susceptibility to promote active solifluction. Local variations in this susceptibility across a slope could account for differential slope movement leading to the development of steps. Frost penetration of the slope mantle, sufficient for the steps to form, could have been produced by either a decline of at least 4° F in mean annual temperature or by stronger winter winds blowing more snow off exposed sites. The convex land forms on which the steps occur are not due to glacial smoothing, as previously thought, but to periglacial frost shattering of bedrock followed by solifluction. The last main period of solifluction 2000–3000 years ago produced most of the steps. The mechanisms, however, by which the steps assumed lobe and tongue forms or asymmetry, are not understood. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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