2020
DOI: 10.5038/1827-806x.49.3.2319
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Abstract: Classically, the Upper Cretaceous Chalk Group aquifer of northwest Europe is conceptualized as a homogenous dual-porosity aquifer, with high porosity related to its fine-grained porous matrix, and intermediate hydraulic conductivity associated with fractures. However, an increasing number of hydrological studies visualize the Chalk as a heterogeneous karst aquifer due to the localised presence of dissolutionally enlarged conduits. Field investigation suggests that cave development is guided by distinct stratig… Show more

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Cited by 4 publications
(4 citation statements)
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References 65 publications
(130 reference statements)
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“…A huge volume of chalkstone was exported from this area to the buildings of the Seine Valley during the Middle Ages (Ballesteros et al, 2021) and following centuries, competing with other construction workshops in Caen, Vernon and Paris, among others (Dujardin, 2004(Dujardin, , 2006. The quarried bedrock in Caumont corresponds to dedolomitized chalk, a singular coccolithic limestone of the Upper Cretaceous in age (Ballesteros et al, 2020(Ballesteros et al, , 2021. This quarrying area includes more than 10 exploitations (e.g., Caumont, Maquisards, Pylone, Jacqueline); the major one is specifically named Caumont quarry (Sibout, 2011;Tomat, 2009), the openings of which are located at 200 m from the River Seine (Figure 1b).…”
Section: Settingsmentioning
confidence: 99%
“…Indeed, the Gros Lien bed shows abundant rhombohedral moulds filled by calcite related to the development of hardgrounds during chalk diagenesis. Consequently, the occurrence of hardgrounds (detailed in Ballesteros et al, 2020) explains the quality of the Caumont chalkstone as a historical construction material.…”
Section: Stratigraphy Of the Quarried Bedrockmentioning
confidence: 99%
“…They are especially important in low-dip settings. Evidence from cliff and quarry sections, boreholes, accessible chalk caves, adits and springs suggest these horizons play an important role in the development of conduit networks (Ballesteros et al, 2020).…”
Section: The Chalkmentioning
confidence: 99%
“…Marl seams can influence recharge processes significantly, creating horizons with high matric potential (Gallagher et al, 2012). In parts of the succession, hardgrounds are important inception horizons, notably the Chalk Rock in the Chiltern Hills and in Normandy where they host conduits and cave systems (Ballesteros et al, 2020) and springs (Figure 7C). The majority of the small solutionally enlarged conduits and dissolution tubules developed along these inception horizons are likely to be formed by mixing dissolution, locally enlarged by later epigenic dissolution.…”
Section: Role Of Chalk Lithology and Fracturesmentioning
confidence: 99%