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- ...ssions. The Cornbrash Formation, which immediately overlies the top of the Ravenscar Group, was also deposited during a major marine transgression and marks a substan ...15 KB (2,247 words) - 14:21, 29 January 2015
- | RAVENSCAR GROUP – SANDSTONE, SILTSTONE AND MUDSTONE ...33 KB (3,749 words) - 09:09, 4 May 2017
- ...is subdivided by a number of marine horizons. Only the lowest part of the Ravenscar Group — namely the Saltwick and Ellerbeck Formations — can be seen at Whitby. The ...13 KB (2,086 words) - 11:00, 11 May 2020
- ...in many places. In the Cleveland Basin, the Dogger Formation underlies the Ravenscar Group (J2–3) which comprises fluviodeltaic sandstones and mudstones with some bed ...10 KB (1,584 words) - 12:26, 19 June 2014
- ...lum Shales Member) overlain by sandstones, siltstones and mudstones of the Ravenscar Group [NZ 8346 1586]. ]] ...19 KB (2,834 words) - 09:00, 6 August 2021
- ...eral million years. The Scalby Formation is the highest subdivision of the Ravenscar Group and in late Middle Jurassic (Callovian) times fully marine conditions were ...15 KB (2,346 words) - 11:01, 11 May 2020
- ...00 m in thickness. The overlying Lias can be up to 450 m in thickness, the Ravenscar Group 250 m, the Oxford Clay Formation 50 m and the Corallian Group 100 m in thic ...than the south (150 m thick at 150 m below OD). The thickness of the Ravenscar Group, Oxford Clay and Kellaways Formations and the Corallian are relatively cons ...149 KB (21,908 words) - 11:40, 3 December 2019
- ...eroded into brown, fine-grained, ferruginous sandstone of the mid-Jurassic Ravenscar Group (Crinoid Grit Member). It is some 10 m deep and between 2 and 4 m ...10 KB (1,623 words) - 10:59, 11 May 2020
- ...Basin, is an erosional '''outlier''', where the Middle Jurassic sandstone (Ravenscar Group) is detached from the main plateau. This Lower to Middle Jurassic sedimenta ...18 KB (2,832 words) - 10:58, 11 May 2020
- The Middle Jurassic Ravenscar Group (‘Deltaic Series’) of Yorkshire: Recent sedimentological studies as demonst ...183 KB (23,637 words) - 14:56, 2 May 2022