The BGS Lexicon of Named Rock Units — Result Details

Plenus Marls Member (Northern Province)

Computer Code: PLMN Preferred Map Code: notEntered
Status Code: Pending Upgrade
Age range: Cenomanian Age (KE) — Cenomanian Age (KE)
Lithological Description: Thinly bedded dark-coloured calcareous mudstone (marl) overlain by rubbly limestone and calcareous silty beds followed by a higher calcareous mudstone/siltstone (marl).
Definition of Lower Boundary: Underlain by the Ferriby Chalk Formation at an uneven erosional boundary at the base of thinly bedded dark-coloured calcareous mudstones (marls).
Definition of Upper Boundary: The upper boundary is conformable at the base of the Black Band (the "Main" Black Band of Wood et al. 1997).
Thickness: none recorded or not applicable
Geographical Limits: none recorded or not applicable
Parent Unit: Welton Chalk Formation (WCK)
Previous Name(s): Plenus Marl [Obsolete Name And Code: See PLMA And PLMN] (PLNM)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Melton Ross Quarry. Temporary sections visible during extraction operations or by excavation 
Reference(s):
Wood, C J and Mortimore, R N. 1995. An anomalous Black Band succession (Cenomanian-Turonian boundary interval) at Melton Ross, Lincolnshire, eastern England and its international significance. Berliner Geowissenschaftliche Abhandlungen, Reihe E, Vol.16, 277-287. 
Dodsworth, P. 1996. Stratigraphy, microfossils and depositional environments of the lowermost part of the Welton Chalk Formation (late Cenomanian to early Turonian, Cretaceous) in eastern England. Proceedings of the Yorkshire Geological Society, Vol.51, 45-64. 
Sumbler, M G. 1999. The stratigraphy of the Chalk Group in Yorkshire and Lincolnshire. British Geological Survey Technical Report WA/99/02. 
Wood, C J, Batten, D J, Mortimore, R N and Wray, D S. 1997. The stratigraphy and correlation of the Cenomanian-Turonian boundary interval succession in Lincolnshire, northern England. Freiberger Forschungsheft, Reihe C, Vol. 468, 333-346. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable