The BGS Lexicon of Named Rock Units — Result Details

Elsworth Rock Formation

Computer Code: ELR Preferred Map Code: notEntered
Status Code: Full, pending ratification
Age range: Oxfordian Age (JO) — Oxfordian Age (JO)
Lithological Description: Highly variable, marly limestone bands and nodules and ferruginous, oolitic clays.
Definition of Lower Boundary: Drawn at base of limestone and ironshot clay of the Elsworth Rock Formation where it rests conformably on the Upper Oxford Clay.
Definition of Upper Boundary: Drawn at conformable upward passage from limestone of the Elsworth Rock Formation to the Ampthill Clay.
Thickness: 2.5 - 10.5 metres.
Geographical Limits: Cambridge district.
Parent Unit: Corallian Group (CR)
Previous Name(s): Elsworth Series (-2782)
Elsworth Rock (-4023)
Elsworth Rock Group (-4635)
West Walton Beds (-2170)
Oakley Beds (-1526)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Elsworth, Cambridgeshire, England. 
Reference(s):
Seeley, H G. 1861a. Notice of the Elsworth and other new rocks in the Oxford Clay, and of the Bluntisham Clay above them. Geologist, Vol.4, 460-461. 
Roberts, T, 1892. The Jurassic rocks of the neighbourhood of Cambridge. Sedgwick Prize Essay for 1886, p.7. 
Wedd, C B, 1898. On the Corallian rocks of Upware, Camnridgeshire. Quarterly Journal of the Geological Society, Vol.54, p.609. 
Arkell, W J. 1937. The zonal position of the Elsworth Rock and its alleged equivalent at Upware. Geological Magazine, Vol.74, p.445. 
Edmonds, E A and Dineham, C H. 1965. Geology of the country around Huntingdon and Biggleswade. Memoir of the British Geological Survey. Sheets 187 and 204 (England and Wales). 
Wedd, C B, 1901. On the Corallian rocks of St Ives and Elsworth. Quarterly Journal of the Geological Society, Vol.57, p.73. 
Worssam, B C and Taylor, J H. 1969. The geology of the country around Cambridge. Memoir of the Geological Survey of Great Britain, Sheet 188 (England and Wales). 
Page, K N, 1986. A new section in the Elsworth Rock (Jurassic, Oxfordian) at Papworth Everard, near Cambridge, England. Proceedings of the Geologists' Associatiion, Vol.97, p. 229-235. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E187 E188 E204