The BGS Lexicon of Named Rock Units — Result Details

Cleveland Ironstone Formation

Computer Code: CDI Preferred Map Code: Cdi
Status Code: Full
Age range: Pliensbachian Age (JE) — Pliensbachian Age (JE)
Lithological Description: Mudstone, silty, argillaceous siltstone and silty sandstone with seams of sideritic and berthierine-ooidal ironstone, which occur typically at the tops of small scale sedimentary cycles.
Definition of Lower Boundary: Downward transition from shaly mudstone with scattered sideritic nodules to siltstone or sandstone of the Staithes Sandstone Formation.
Definition of Upper Boundary: At top of highest ooidal ironstone or at top of row of hard sideritic nodules, succeeded by grey mudstone of the Whitby Mudstone Formation.
Thickness: To c.25 m.
Geographical Limits: Cleveland Basin, North Yorkshire.
Parent Unit: Lias Group (LI)
Previous Name(s): Kettleness Beds [Obsolete Name and Code: Use CDI] (-3286)
Cleveland Ironstone Series [Obsolete Name and Code: Use CDI] (-2065)
Ironstone Series [Obsolete Name and Code: Use CDI, NS] (*57)
Alternative Name(s): none recorded or not applicable
Type Area  North Yorkshire coast. 
Type Section  Coastal exposures near Staithes, North Yorkshire (Penny Nab [NZ 788 189] to Brackenberry Wyke [NZ 794 183]). 
Reference Section  Coastal exposures at Hawsker Bottoms, North Yorkshire (between Clockcase Nab [NZ 955 071] and Hawsker High Scar [NZ 952 075]). 
Cox, B M, Sumbler, M G, and Ivimey-Cook, H C. 1999. A Formational framework for the Lower Jurassic of England and Wales (Onshore Area). British Geological Survey Research Report No. RR/99/01. 
Howarth, M K, 1973. The stratigraphy and ammonite fauna of the Upper Liassic Grey Shales of the Yorkshire coast. Bulletin of the British Museum (Natural History), Geology Series, Vol.29, 235-288. 
Waters, C N, Smith, K, Hopson, P M, Wilson, D, Bridge, D M, Carney, J N, Cooper, A H, Crofts, R G, Ellison, R A, Mathers, S J, Moorlock, B S P, Scrivener, R C, McMillan, A A, Ambrose, K, Barclay, W J, and Barron, A J M. 2007. Stratigraphical Chart of the United Kingdom: Southern Britain. British Geological Survey, 1 poster. 
Howard, A S, 1985. Lithostratigraphy of the Staithes Sandstone and Cleveland Ironstone formations (Lower Jurassic) of north-east Yorkshire. Proceedings of the Yorkshire Geological Society, Vol.45, 261-275. 
Howarth, M K, 1955. Domerian of the Yorkshire coast. Proceedings of the Yorkshire Geological Society, Vol.30, 147-175. 
Hemingway, J E, Wilson, V and Wright, C W, 1963. Geology of the Yorkshire coast. Geologists' Association Guide, No.34. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E062 E043 E035 E044 E042 E052 E054 E055 E065 E064