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Failures in natural slopes: case histories
Published in E. N. Bromhead, The Stability of Slopes, 1992
In contrast to the geologically analogous escarpment at Sevenoaks, the absence of periglacial solifluction features at Lympne indicates that marine erosion at its foot ceased after the Younger Dryas period of the Late Glacial (8850-8050 bc). Indeed, radiocarbon dates on wood recovered from just above a now buried former sea cliff, suggest a much later abandonment, c. 2500 bc. On close inspection, it proves possible to identify an upper, degradation, zone and a lower, accumulation, zone occupying respectively 60% and 40% of the downslope length of the cliff. The slope appears to have developed to its long-term stable angle by virtue of the fact that the slope angles in the degradation and accumulation zones are so nearly equal. However, the presence of numerous slip scarps, soil waves and undulations in the upper slopes, in contrast to the smoother profile of the lower slopes is a reminder of their different mechanics.
Stratigraphy and vegetation signals from an upland, landslide-dammed, paleolake during the Last Glacial-Interglacial Transition, Waipaoa Sedimentary System, Hikurangi Margin, eastern North Island, New Zealand
Published in New Zealand Journal of Geology and Geophysics, 2022
Michael Marden, Katherine Holt, Matthew Ryan, Joe Carrasco, Kathleen Marsaglia, Matthew Kirby, Alan Palmer
When coupled, these records represent sedimentological change since ∼17 cal ka BP, and in vegetation cover over a c. 2200-year period (16.3–14.1 cal ka BP), during the latter part of the climatically variable Last Glacial-Interglacial Transition (LGIT) but before the onset of the Late Glacial Cool Period (c. 13.7–12.5 cal ka BP). During periods of cooler climate in the South Pacific, the supply of sediment to the WSS drainage network might be expected to have declined as scrubland and forest cover matured and spread, and as intense flood-inducing storms traversed higher latitudes less frequently.