The BGS Lexicon of Named Rock Units — Result Details

Phillips Member

Computer Code: PHLP Preferred Map Code: notEntered
Status Code: Full
Age range: Toarcian Age (JT) — Toarcian Age (JT)
Lithological Description: The Phillips Member comprises interbedded grey, calcareous, muddy, marine siltstones and fine sandstones.
Definition of Lower Boundary: The base of the Phillips Member is marked by a downward change from sandstones and siltstones to dark grey mudstones. There is a corresponding increase in gamma values and decrease in velocity.
Definition of Upper Boundary: The top of the member is defined by a downward change from the medium to coarse paralic sandstones of the Wroot Formation to fine, muddy siltstones and sandstones. There is a corresponding downward increase in gamma values. The Phillips Member displays a generally higher and more consistently high velocity in the member.
Thickness: The maximum proved thickness for the member is c. 60 m.
Geographical Limits: The Phillips Member has a restricted distribution and is present only in those areas of the basin where the Lias Group is most thickly developed, e.g. rim synclinal structures and along the Dowsing Fault Zone. Over much of the basin the upper part of the Lias Group was extensively eroded prior to the deposition of the succeeding West Sole Group sediments and therefore the original extent of the Phillips Member is difficult to ascertain.
Parent Unit: Cerdic Formation (CERD)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  North Sea well 47/03b- 4: 1213.5-1254.5 m (3961-4116 ft) (Lott and Knox, 1994). 
Reference Section  North Sea well 48/03- 3: 1248-1306 m (4094^1284 ft) (Lott and Knox, 1994). 
Reference(s):
Knox, R W O B. 1984. Lithostratigraphy and depositional history of the late Toarcian sequence at Ravenscar, Yorkshire. Proceedings of the Yorkshire Geological Society, Vol. 45, 99-108. 
Lott, G K and Knox, R W O'B. 1994. 7. Post-Triassic of the Southern North Sea. In: Knox, R W O'B and Cordey, W G (eds.) Lithostratigraphic nomenclature of the UK North Sea. British Geological Survey, Nottingham. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
none recorded or not applicable