WebThe Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern … Webwas a significant correlation between their density and occurrence and a defined chalk formation. Of the +1,700 features, 1,311 (varying in size) were located in the Portsdown …

Southern Province Chalk nomenclature - White Chalk …

http://www.portsdown-tunnels.org.uk/portsdown/about_portsdown.html WebThe Portsdown Chalk Formation (containing the most karst features) is a part of the Upper Chalk Group. Between the Upper, Middle, and Lower Chalk Groups, the layers vertically and horizontally vary in composition and thickness (Aldiss et al., 2012). Conclusions Pyrite weathering is a major influence on the acidity of the groundwater great knightleys dentist basildon

BGS Linked Data - Culver Chalk Formation

Web['The upper boundary is conformable at the Portsdown Marl (Mortimore, 1986) of the overlying Portsdown Chalk Formation. This marl separates very soft chalks with large potstone flints and some stylolitic surfaces from soft white chalks with regularly-spaced, well-developed thin marl beds.'] WebThe lower boundary is conformable at the base of the Portsdown Marl 1 where it overlies white chalks of the Culver Chalk Formation (Spetisbury Chalk Member) in the Farlington … WebJan 1, 1987 · Complete burial had taken place by the base of the upper Campanian Portsdown Chalk Formation, which is of even thickness across the region. The structures are interpreted with reference to high ... great knightleys dentist