WebThe clay of the Upper Mottled Beds tends to be less variable in colour than that of the Lower Mottled Beds. It is typically grey mottled with brown but may also be mottled or multicoloured red or yellow. Beds of dark grey or black clay occur locally. This unit can include channel-form bodies of cross-bedded, fine- to medium-grained sand. WebLondon near the base of the Lower Mottled Clay (Thiry et al. 1998). The base of the CIE has also been identified in the Cobham Lignite Bed, east of London (Collinson et al. 2003), underlying the Lower Shelly Clay (the Lower Mottled Clay is not present in this area). The start of the Apectodinium influx, which in marine and marginal-marine
Clay stratigraphy of the Lambeth Group of borehole IOD8R
WebMar 1, 2016 · The London Clay has historically proven difficult to subdivide, owing to its homogeneity and lack of exposure; however, the upper part (the Claygate Member) has generally been recognised as sandier than the lower parts for over a … WebAug 9, 2014 · The overlying succession comprises the Lower Mottled Clay (Reading Formation), Lower Shelly Clay and laminated Beds (Woolwich Formation), Upper Mottled Clay (Reading Formation) and Upper Shelly Clay (Woolwich Formation) (Ellison and King 2004), overlain by the London Clay Formation. The Woolwich Formation comprises mainly … tack weld traduction
OR/13/006 Mineralogy - MediaWiki - British Geological Survey
WebJan 1, 2007 · Samples from the Lower Mottled Clay Member of the Reading Formation show clear evidence of multiple provenance. Grain-size and heavy mineral characteristics show … WebLike the Lower Mottled Clay (LMCL), the Lower Mottled Beds typically consists of purple, red, green, blue-grey and brown mottled or multicoloured unbedded clays, some silty or … WebThe Woolwich Formation rests on the Lower Mottled Clay of the Reading Formation (Figure 12). Lower Shelly Clay. This unit, characterised at outcrop by finely comminuted shell debris in a clay soil, is the most easily distinguished of the informal units of the Lambeth Group. It crops out principally in south-east London (Figure 17). tack weld thickness