2006
DOI: 10.1016/s0016-7878(06)80033-7
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Bedding and pseudo-bedding in the Early Jurassic of Glamorgan: deposition and diagenesis of the Blue Lias in South Wales

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Cited by 14 publications
(11 citation statements)
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“…Despite these observations, water depth does not explain the temporal pattern of body size increase in P. giganteum in the Blue Lias Formation because it was deposited during an overall deepening trend (Hallam ; Sheppard ; Sheppard et al . ). The initially small size of Plagiostoma punctatum in the Langport Member may relate to the reported unusual salinity at this level (Hallam ; Hallam & El Shaarawy ) but this is unlikely to be an influencing factor for the other species because they first appear above the Langport Member.…”
Section: Discussionmentioning
confidence: 97%
See 1 more Smart Citation
“…Despite these observations, water depth does not explain the temporal pattern of body size increase in P. giganteum in the Blue Lias Formation because it was deposited during an overall deepening trend (Hallam ; Sheppard ; Sheppard et al . ). The initially small size of Plagiostoma punctatum in the Langport Member may relate to the reported unusual salinity at this level (Hallam ; Hallam & El Shaarawy ) but this is unlikely to be an influencing factor for the other species because they first appear above the Langport Member.…”
Section: Discussionmentioning
confidence: 97%
“…The Blue Lias and Charmouth Mudstone formations were deposited under fully marine conditions, with the Blue Lias representing an interval of transgression, during which the deepest waters were attained during the lowermost Sinemurian ( bucklandi Zone) (Hallam ; Sheppard ; Sheppard et al . ). Localities on the Glamorgan coast were deposited much closer to a palaeo‐shoreline than those across the Bristol Channel on the Somerset coast (Wobber ; Johnson & McKerrow ).…”
Section: Geological Settingmentioning
confidence: 97%
“…The development of stratiform shale partings is a characteristic feature of the 'offshore' Blue Lias hemipelagic facies, and this, together with the presence of swaly crossstratification and bioturbation more typical of the Blue Lias shelf facies (Sheppard et al 2006), leads to the inference of a substantially deeper-water (transition-offshore) depositional setting (Fig. 3).…”
Section: Micrite-shale Lithofaciesmentioning
confidence: 99%
“…7). Transgression resumed in late angulata times (Hesselbo & Jenkyns 1998), peaking in the upper angulata to basal bucklandi Biozone, which is then characterized by a progressive shallowing in the South Wales sections (Sheppard et al 2006). It is therefore possible to suggest that the upper bounding surface of Package 3 (the 'basal marl' of Hallam 1960), which undoubtedly represents a maximum flooding surface, coincides with the base of the bucklandi Biozone.…”
Section: Trwyn-y-witchmentioning
confidence: 99%
“…Data were collected from coastal exposures of an interbedded sequence of shalemarl-limestone from the lower Jurassic (Hettangian -Sinemurian), known locally as the Blue Lias Formation (Whittaker and Green, 1983;Sheppard et al, 2006). The area was chosen because of the excellence of the exposure on a wave-cut platform and the marked difference in the intensity and form of joints in the limestones and shales and marls, hereafter referred to simply as shales.…”
Section: Region Of Investigationmentioning
confidence: 99%