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 Rock (-4023)
Oakley Beds (-1526)
Elsworth Series (-2782)
Elsworth Rock Group (-4635)
West Walton Beds (-2170)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Area  Elsworth, Cambridgeshire, England. 
Reference(s):
Wedd, C B, 1898. On the Corallian rocks of Upware, Camnridgeshire. Quarterly Journal of the Geological Society, Vol.54, p.609. 
Roberts, T, 1892. The Jurassic rocks of the neighbourhood of Cambridge. Sedgwick Prize Essay for 1886, p.7. 
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. 
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. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E187 E188 E204