The geomorphology of the south-central Mendip Hills

Ford, Derek C.; Stanton, William Iredale

doi:10.1016/s0016-7878(68)80012-4

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…Similarly, neighbouring caves may have radically 208 different morphologies depending on the degree of sediment input. Ford (1963) describes the contrast 209 between Swildon's Hole and the sediment modified St Cuthbert's Swallet system in the Mendip Hills,7 UK. Sediment aggradation is normally temporally limited, related to episodic, one off or extreme 211 events such as landslide triggered debris flows, solifluction and periglacial mass-movements, 212 monsoon or cyclone-induced floods or sinkhole collapse.…”

Section: Introduction 24mentioning

confidence: 99%

Role of sediment in speleogenesis; sedimentation and paragenesis

Farrant

Smart

2011

Geomorphology

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6Although the effects of sedimentation in caves have been recognised for many years, its role in 7 speleogenesis is frequently overlooked. Influxes of sediment into a cave system fundamentally alters 8 the way cave passages develop, either by alluviation in a vadose environment, forcing lateral 9 corrosion and the development of notches, or upwards dissolution in a phreatic environment through a 10 process known as paragenesis. Sediment influxes affect the hydrological functioning of a karst aquifer 11 by changing the way conduits behave and subsequently develop both in plan and long section. 12Here we give an overview of the mechanisms of cave sedimentation and describe how the process of 13 alluviation and paragenesis affect speleogenesis. A characteristic suite of meso-and micro-scale 14 dissolutional features can be used to recognise paragenetic development, which is reviewed here. In a 15 vadose environment these include alluvial notches, whilst in a phreatic environment, half tubes, 16 anastomoses and pendants, bedrock fins and paragenetic dissolution ramps result. Using these to 17 identify phases of sedimentation and paragenesis is crucial for reconstructing denudation chronologies 18 from cave deposits. We suggest that sedimentation and paragenesis is most likely to occur in certain 19 geomorphological situations, such as ice marginal and periglacial environments, beneath thick 20 residual soils and where rivers can transport fluvial sediment into a cave, either via stream sinks or 21 back-flooding. 22

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Section: Introduction 24mentioning

confidence: 99%

Role of sediment in speleogenesis; sedimentation and paragenesis

Farrant

Smart

2011

Geomorphology

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“…Hence in some areas there is a vast caving literature. Unfortunately, even in areas where relatively modern geological memoirs and guides have been published, the amount of emphasis placed on surface/subsurface landforms is very limited; a good example of a surface study is that by Ford & Stanton (1968 surface rocks on which engineering development takes place.…”

Section: Site Investigationmentioning

confidence: 99%

Limestone weathering: its engineering significance and a proposed classification scheme

Fookes¹,

Hawkins

1988

QJEGH

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As a foundation material, limestone differs from other rocks in that voids may be found at almost any depth within the rock mass. They may result directly from solution weathering near the surface and along discontinuities, or as specific cave systems at depths related to present or past ground water levels.The paper reviews the processes involved in the weathering by solution of the crystalline limestones, typically of Palaeozoic age. It offers a tentative, simple engineering classification of the solution features characteristic of limestones; and presents case histories to illustrate some of the problems which may be encountered during construction in areas of limestone bedrock.

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“…Where doline formation pre‐dates recent glaciations, dolines have the potential to be valuable stratigraphic repositories for evidence of Quaternary environmental changes (e.g. Ford & Stanton, 1968; West et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Late Wolstonian and Ipswichian (MIS 6/5e) sediment fill in a limestone sinkhole, Askham Fell, northern England

Carling,

Evans,

Abbas

et al. 2023

J Quaternary Science

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In 2019 a sinkhole (doline) occurred in Late Devensian till above fissured limestone in northern England. Most sediment plugging the fissure was evacuated down into a karstic drainage system. The residual sedimentary fill comprises three main lithofacies, dated using optically stimulated luminescence to between 170.7 ± 40.0 and 56.1 ± 13.5 ka. The earliest date demonstrates fissures were present in the limestone pavement at the time of Marine Isotope Stage (MIS) 6, or shortly thereafter. The fissure filled with fine sand and silt due to surface runoff and aeolian processes probably at the MIS 6 to MIS 5e transition after Wolstonian glacial ice had retreated. The deposits then collapsed into the karst system. Further fine sand and silt deposition occurred during MIS 3; this deposit filled the central cavity surrounded by residual MIS 6/5e deposits. The sequence was capped by till as Late Devensian (MIS 2) ice transgressed the area. Solution fissures in the karst surfaces of northern England may pre‐date the Late Devensian glaciation. Moreover, fissures are repositories of pre‐Devensian sediment deposits which survived the Late Devensian glaciation and the Ipswichian interglacial. Such sites should provide information on the nature and timing of pre‐Devensian glacial–interglacial events and shed light on basal ice conditions and glaciokarst drainage behaviour.

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The geomorphology of the south-central Mendip Hills

Cited by 16 publications

References 5 publications

Role of sediment in speleogenesis; sedimentation and paragenesis

Role of sediment in speleogenesis; sedimentation and paragenesis

Limestone weathering: its engineering significance and a proposed classification scheme

Late Wolstonian and Ipswichian (MIS 6/5e) sediment fill in a limestone sinkhole, Askham Fell, northern England

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