Periglacial and Allied Phenomena in Western Otago

McCraw, J. D.

doi:10.1111/j.1745-7939.1959.tb00242.x

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…Considerable attention has been devoted to patterned ground landforms on the block-faulted schistose mountains of Central and North Otago, New Zealand (e.g. McCraw, 1959;Brockie, 1973;Billings and Mark, 1961;Mark and Bliss, 1970;Fahey, 1986;Soons and Price, 1990;Orwin, 1993). On the Old Man Range, earth hummocks are repeating hillocks or mounds generally less than 40 cm high, and non-sorted stripes are essentially the same formation, but developed as elongate corrugations on gentle slopes (Billings and Mark, 1961).…”

Section: Introductionmentioning

confidence: 99%

Temperature and moisture trends in non‐sorted earth hummocks and stripes on the Old Man Range, New Zealand: implications for mechanisms of maintenance

Scott

Dickinson

Barratt

et al. 2008

Permafrost & Periglacial

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The mechanisms of maintenance of earth hummocks and non-sorted stripes in seasonally frozen ground on the Old Man Range, Otago, New Zealand were investigated. These landforms are hypothesised to be active periglacial landforms maintained by seasonal movement of moisture down an energy gradient. We tested three hypotheses: 1) freezing should occur predominantly in the crests of the stripes and hummocks; 2) differential freezing patterns should be consistent between years; and 3) in the presence of a temperature gradient (i.e. in winter), soil moisture content should be greater in crests than in furrows. An array of 39 thermistors at each of two sites was used to monitor soil temperature gradients during three winters, and replicate soil cores were taken in autumn and winter to determine soil moisture gradients. Freezing occurred mainly in the crests and sides (heavily influenced by aspect), and patterns of freezing showed strong interannual consistency, supporting our first two hypotheses. Soil in crests had a higher moisture content in both freezing and thawed seasons, which was inconclusive relative to the expected water gradient. Figure 1 (A) Stripe study site (about 1590 m a.s.l.) on the Old Man Range, viewed looking northeast. Data logger was housed in the large (47 cm Â 47 cm Â 22 cm) steel box. (B) Hummock study site (about 1640 m a.s.l.) viewed looking due west with the Garvie Mountains in the distance. (C) Schematic of the soil profile beneath a hummock or stripe transect.

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Section: Introductionmentioning

confidence: 99%

Temperature and moisture trends in non‐sorted earth hummocks and stripes on the Old Man Range, New Zealand: implications for mechanisms of maintenance

Scott

Dickinson

Barratt

et al. 2008

Permafrost & Periglacial

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“…Removal of the loose surface stones exposed ice-cemented boulders at a depth of 10 in., but fine material was still lacking. The features give a strong impression of a pit filled with loose stones and are apparently similar to the "stone pits" of Lundqvist (1962) and to structures in Western Otago, New Zealand (McCraw, 1959). They are possibly related to sorted stone rings but do not have the central portion of fines characteristic of these structures.…”

Section: Stone Pitsmentioning

confidence: 60%

“…Recent movement of the terraces is evidenced by upturned stones on the scarps (upturned stones are easily detected for they expose white, coated, under surfaces), and by the over running of polygon cracks by the terraces. The terrace scarps lie at an angle of about 60° and are not as steep as those on New Zealand mountains where some scarps are overhanging (McCraw, 1959). Lack of vegetation on Antarctic terraces probably accounts for the differences in slope.…”

Section: Solifluction Terracesmentioning

confidence: 93%

Some Surface features of McMurdo Sound Region, Victoria Land, Antarctica

McCraw¹

1967

New Zealand Journal of Geology and Geophysics

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“…This depression contains a jumble of large, bare, angular greywacke fragments similar to those in the stone streams and is in appearance not unlike a shallow kettle hole. Similar features at high altitudes in Central Otago have been termed stone drains by McCraw (1959).…”

Section: Nz Journal \)F Geology and Geophysicsmentioning

confidence: 95%

Notes on the geology of the Blue Mountain district, South Canterbury

Gair¹

1962

New Zealand Journal of Geology and Geophysics

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Two infaulted outliers of Tertiary rocks occur on low saddles within the Four Peaks -Blue Mountain Ranges. One consists of marine sediments of Kaiatan to Waitakian age and is a condensed succession of the much thicker sequences found nearer the coast in the Pareora and Kakahu districts, and the other consists of about 20 ft of non-marine coal measures of Arnold age. Calcite prisms and prismatic holes, presumably representing the Permian lamellibranch Atomodesma, are present in an exposure of greywacke and argillite near the Mowbray River. Stone streams occur on an exhumed fossil peneplain surface that forms the back slope of the tilted fault block adjacent to the Tertiary outlier near Blue Mountain. They are considered to have formed during the last glacial stage and to have been shed from outcrops that ar.e no longer existent.

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Periglacial and Allied Phenomena in Western Otago

Cited by 12 publications

References 4 publications

Temperature and moisture trends in non‐sorted earth hummocks and stripes on the Old Man Range, New Zealand: implications for mechanisms of maintenance

Temperature and moisture trends in non‐sorted earth hummocks and stripes on the Old Man Range, New Zealand: implications for mechanisms of maintenance

Some Surface features of McMurdo Sound Region, Victoria Land, Antarctica

Notes on the geology of the Blue Mountain district, South Canterbury

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