Chalk of the UK - Appendix 2: Nomenclature terms utilised on published 1:50 000 scale BGS Geological sheets in England and Scotland (S)

This table incorporates all of the terms used to describe and divide the Upper Cretaceous successions shown on the published 1:50 000 scale maps currently available (listed by number). The terms that are recommended for use in the framework described in this report are given in bold. Redundant terms in normal type have been given an equivalent term within the framework, where such a term is discernible and meaningful. It is recommended that these replacement terms are used when maps come-up for revision.

Terms used on BGS 1:50 000 Geological Maps in England and Scotland

Term Used	50K Sheet number (s) on which term appears	Equivalent term in framework
Blandford Chalk	313	Seaford Chalk and Newhaven Chalk Formations undivided
Brandon Flint Series	175	Bed or Member as yet undefined within the Lewes Nodular Chalk Formation
Burnham Chalk	55&65, 80, 81&82 and pt 90, 89, 90 & 91,	Burnham Chalk Formation
Burnham Formation	73, 103	Burnham Chalk Formation
Cambridge Greensand	173, 175, 187, 188, 189, 204, 205, 206, 221	Cambridge Greensand Member. Equivalent to the Melbury Sandstone Member and the Glauconitic Marl Member
Cenomanian Greensand	S52E, S52E, S43, S44	Morvern Greensand Formation
Chalk	208 & 225, 256, 331	Chalk Group
Chalk (Flamborough, Burnham and Welton Chalks), undifferentiated	104	The major part of the White Chalk Subgroup
Chalk Group	257, 268, 269, 281, 297, 299, 300, 313, 316, 317&332, 328, 341&342, 343&342	Chalk Group defined within the Northern and Southern provinces in England
Chalk Group, undivided	176	Chalk Group defined within the Northern and Southern provinces in England
Chalk Marl	187, 267, 283, 284	Part of the Grey Chalk Subgroup. All of the West Melbury Marly Chalk Formation and the lower part of the Zig Zag Chalk Formation
Chalk Rock	175, 188, 189, 204, 205, 206, 220, 221, 237, 238, 239, 253, 254, 255, 267, 282, 283, 312, 327, 331	Chalk Rock Member, part of the Lewes Nodular Chalk Formation
Chalk with flints (Middle Chalk)	63	Equivalent to part of the Welton Chalk Formation and Burnham Chalk Formation
Chalk without flints (Lower Chalk)	63	Equivalent to the Ferriby Chalk Formation and the lowest part of the Welton Chalk Formation
Chilton Stone	253	Equivalent to the Totternhoe Stone Member of the Zig Zag Chalk Formation
Culver Chalk Formation	299, 314, 343&342	Culver Chalk Formation. Includes the Tarrant Chalk Member and the Spetisbury Chalk Member where these are discernible
Ferriby Chalk	55&65, 80, 81&82 pt 90, 89, 90&91, 104,116	Ferriby Chalk Formation
Ferriby Chalk Formation	54, 64, 72, 115	Ferriby Chalk Formation
Ferriby Formation	73, 103	Ferriby Chalk Formation
Flamborough Chalk	55&65, 80, 81&82 pt 90, 90&91	Flamborough Chalk Formation
Flamborough Chalk Formation	54, 64, 72	Flamborough Chalk Formation
Flamborough Formation	73	Flamborough Chalk Formation
Glauconitic Marl	237, 254, 289, 299, 300, 316, 317&332	Glauconitic Marl Member of the West Melbury Marly Chalk Formation
Glauconitic sandstone (≡Greensand)	S43N, S43S	Morvern Greensand Formation
Grey Chalk Subgroup	299, 314	Grey Chalk Subgroup. Includes the Zig Zag Chalk Formation and the West Melbury Marly Chalk Formation in the Southern Province; is equivalent to the Ferriby Chalk Formation in the Northern Province
Hard bed	328	Informally named part of the Newhaven Chalk Formation
Holywell Chalk	271, 313	Holywell Nodular Chalk Formation, originally excluded the Plenus Marls Member
Holywell Nodular Chalk	297, 300, 316, 317&332	Holywell Nodular Chalk Formation, originally excluded the Plenus Marls Member
Holywell Nodular Chalk Formation	204, 205, 281, 299, 314, 328, 341&342, 343&342	Holywell Nodular Chalk Formation. Includes the Plenus Marls Member and the Melbourn Rock Member
Horizon of Chalk Rock	284, 286	Chalk Rock Member, part of the Lewes Nodular Chalk Formation
Hunstanton Chalk Formation	64, 72	Hunstanton Formation no longer part of the Chalk Group
Hunstanton Formation	54	Hunstanton Formation no longer part of the Chalk Group
Hunstanton Member	73, 103	Hunstanton Formation no longer part of the Chalk Group
Laig Gorge Limestone	S60	Informal term for a bed within the Laig Gorge Sandstone Member equivalent in age to the Lochaline White Sandstone Formation
Lewes Chalk	271, 313	Lewes Nodular Chalk Formation
Lewes Nodular Chalk	297	Lewes Nodular Chalk Formation
Lewes Nodular Chalk and Seaford Chalk Members, undifferentiated	205	Undivided Lewes Nodular Chalk and Seaford Chalk formations
Lewes Nodular Chalk Formation	204, 299, 314, 343&342	Lewes Nodular Chalk Formation. Includes the Chalk Rock Member
Lewes Nodular Chalk Member	268, 281, 300, 316, 317&332, 328, 341&342	Lewes Nodular Chalk Formation
Loch Aline Glass Sand (Loch Aline)	S44W pt 44E, S44E	Lochaline White Sandstone Formation
Lower Beds (Chalk Marl)	188	Equivalent to the West Melbury Marly Chalk Formation
Lower Chalk	53, 129, 132&148, 145& pt 129, 159, 161, 162, 173, 175, 187, 188, 189, 190, 206, 207, 220, 221, 222, 237, 238, 239, 240, 252, 253, 254, 255, 257, 266, 267, 268, 269, 270, 271, 272, 273, 274, 282, 283, 284, 286, 287, 288, 289, 290, 297, 298, 300, 305&306, 311, 312, 313, 315, 316, 317&332, 318&333, 319, 327, 329, 330, 331, 334	Equivalent to the Grey Chalk Subgroup (West Melbury Marly Chalk Formation and Zig Zag Formation) with the inclusion of the Plenus Marls Member of the succeeding Holywell Nodular Chalk Formation
Lower Chalk (grey chalk)	284	Equivalent to the Grey Chalk Subgroup with the inclusion of the Plenus Marls Member of the succeeding Holywell Nodular Chalk Formation
Lower Chalk Formation	146, 160, 204, 205, 281, 328, 341&342	Equivalent to the Grey Chalk Subgroup with the inclusion of the Plenus Marls Member of the succeeding Holywell Nodular Chalk Formation
Lower Chalk without flint	71,327	Equivalent to the Ferriby Chalk Formation and the lowest part of the Welton Chalk Formation on 71. Equivalent to the Grey Chalk Subgroup with the inclusion of the Plenus Marls Member on 327
Melbourn Rock	129, 145& pt129, 175, 188, 189, 204, 205, 206, 220, 221, 237, 238, 252, 253, 254, 255, 267, 282, 283, 284, 285, 286, 287, 288, 289, 305&306, 312, 318&333, 319, 331, 334	Melbourn Rock Member of the Holywell Nodular Chalk Formation
Melbourn Rock Member	299, 314	Melbourn Rock Member of the Holywell Nodular Chalk Formation
Melbourne Rock	272, 273	Melbourn Rock Member of the Holywell Nodular Chalk Formation
Melbury Sandstone	297, 313	Melbury Sandstone Member of the West Melbury Marly Chalk Formation. Equivalent to the Glauconitic Marl Member. Initially attributed to the Upper Greensand Formation
Melbury Sandstone Member	281	Melbury Sandstone Member of the West Melbury Marly Chalk Formation. Equivalent to the Glauconitic Marl Member. Initially attributed to the Upper Greensand Formation
Middle Chalk	129, 132&148, 145&129 161, 162, 175, 188, 189, 190, 206, 207, 221, 222, 223, 237, 238, 239, 240, 252, 253, 254, 255, 257, 266, 267, 268, 269, 270, 271, 272, 273, 274, 282, 283, 284, 285, 286, 287, 288, 289, 290, 297, 298, 300, 305&306, 311, 312, 313, 315, 316, 317&332, 327, 329, 330, 331	Equivalent to the lowest part of the Lewes Nodular Chalk Formation, the New Pit Chalk Formation and the Holywell Nodular Chalk (with the exclusion of the Plenus Marls Member) formations
Middle Chalk and Lower Chalk	Isle of Wight pts 330, 331, 344, 345	Basal Lewes Nodular Chalk Formation to the base of the Chalk Group
Middle Chalk Formation	146, 160, 204, 205, 281, 328, 341&342	Equivalent to the New Pit Chalk Formation and the Holywell Chalk Formation with the exclusion of the Plenus Marls Member
Middle Chalk with flint	71	Lower Burnham Chalk Formation and most of the Welton Chalk Formation
Morvern Greensand	S44W pt 44E, S44E	Morvern Greensand Formation
Morvern Greensand Formation	S70	Morvern Greensand Formation
New Pit Chalk	271, 297, 313	New Pit Chalk Formation
New Pit Chalk Member	204, 205, 281, 300, 316, 317&332, 328, 341&342	New Pit Chalk Formation
New Pit Chalk Formation	299, 314	New Pit Chalk Formation
Newhaven Chalk Formation	299, 314, 343&342	Newhaven Chalk Formation
Newhaven Chalk Member	300, 316, 317&332, 328, 341&342	Newhaven Chalk Formation
Plenus Marl	273	Plenus Marls Member of the Holywell Nodular Chalk Formation
Portsdown Chalk Formation	299, 314, 343&342	Portsdown Chalk Formation
Portsdown Chalk Member	316, 317&332, 328, 341&342	Portsdown Chalk Formation
Red Chalk	53, 55&65, 63, 71, 80, 81&82 pt 90, 89, 90&91, 115, 129, 145&pt129, 146	Hunstanton Formation
Red Chalk (Hunstanton Member)	104, 116	Hunstanton Formation
Rowe Formation	73	Rowe Chalk Formation
Sandstone and limestone with flint	S44
Seaford and Newhaven (Undivided) Seaford and Newhaven Chalk, undivided	328, 341&342, 343&342	Seaford Chalk Formation and Newhaven Chalk Formation undivided
Seaford Chalk	297	Seaford Chalk Formation
Seaford Chalk Formation	299, 314, 343&342	Seaford Chalk Formation
Seaford Chalk Member	281, 300, 316, 317&332, 328, 341&342	Seaford Chalk Formation
Seaford to Spetisbury, undivided	343&342	Seaford Chalk, Newhaven Chalk and Culver Chalk formations undivided
Siliceous and glauconitic sandstone	S52W, S52E,	Morvern Greensand Formation
Silicified Chalk	S43	Gribun Chalk Formation
Silicified Chalk (≡Gribun Chalk)	S43N	Gribun Chalk Formation
Silicified limestone with flint (Torosay)	S44W& pt44E, S44E	Gribun Chalk Formation
Spetisbury Chalk	313	Spetisbury Chalk Member
Spetisbury Chalk Member	299, 314, 316, 317&332, 328, 341&342, 343&342	'Spetisbury Chalk Member of the Culver Chalk Formation'
Stockbridge Rock Member	299	Stockbridge Rock Member of the Seaford Chalk Formation
Tarrant and Spetisbury Chalk (Undivided)	328	Culver Chalk Formation
Tarrant Chalk	313	Tarrant Chalk Member
Tarrant Chalk Member	299, 300, 314, 316, 317&332, 328, 341&342, 343&342	Tarrant Chalk Member of the Culver Chalk Formation
Top Rock	204, 206, 220, 221	Top Rock Bed within the Lewes Nodular Chalk Formation
Totternhoe Stone	145&129, 173, 175, 188, 189, 204, 205, 206, 220, 221, 237, 254	Totternhoe Stone Member at the base of the Zig Zag Chalk Formation
Uintacrinus Band	273	Bed within the Newhaven Chalk Formation (Margate Chalk Member)
Upper and Middle Chalk	241	White Chalk Subgroup excluding the Plenus Marls Member
Upper and Middle Chalk, undivided	318&333, 319, 334	White Chalk Subgroup excluding the Plenus Marls Member
Upper Beds	188	Part of the Zig Zag Chalk Formation
Upper Chalk	132&148, 161, 162, 175, 188,189, 190, 191, 206, 207, 220, 221, 222, 223, 237, 238, 239, 240, 253, 254, 255, 257, 266, 267, 268, 269, 270, 271, 272, 273, 274, 282, 283, 284, 285, 286, 287, 288, 289, 290, 297, 298, 300, 305&306, 311, 312, 313, 315, 316, 317&332, 327, 329, 330, 331, IoW pts 330 331 344 345	Equivalent to most of the Lewes Nodular Chalk Formation (from the base of the Chalk Rock Member) and the succeeding formations up to the pre-Palaeogene unconformity. Term includes the highest chalks in East Anglia
Upper Chalk Formation	146, 160, 204, 205, 281, 328, 341&242	Equivalent to the Lewes Nodular Chalk Formation and the succeeding formations up to the pre-Palaeogene unconformity.
Upper Chalk with flint	71	Equated with the Burnham Chalk Formation
Upper Cretaceous limestone and sandstone	S71W	Inner Hebrides Group
Upper Cretaceous undivided	S43N	Inner Hebrides Group
Welton Chalk	55&65,80, 81&82 pt 90, 89, 90&91,116	Welton Chalk Formation
Welton Chalk Formation	115	Welton Chalk Formation
Welton Chalk and Burnham Chalk Formations, undiv	54, 64, 72
Welton Formation	73, 103	Welton Chalk Formation
West Melbury Chalk	313	West Melbury Marly Chalk Formation
West Melbury Marly Chalk	297	West Melbury Marly Chalk Formation
West Melbury Marly Chalk Member	204, 205, 281, 300, 316, 317&332, 328	West Melbury Marly Chalk Formation
West Melbury Marly Chalk Formation	299, 313	West Melbury Marly Chalk Formation. Includes the Melbury Sandstone Member, the Glauconitic Marl Member and the Cambridge Greensand Member as its basal unit.
White Chalk Subgroup	299, 314, 343&342	White Chalk Subgroup. Includes the Lewes Nodular Chalk Formation and formations above in the Southern Province; the Welton Chalk Formation and formations above in the Northern Province
White Sandstone	S43	Lochaline White Sandstone Formation
White sandstone (≡ Loch Aline Glass Sand)	S43N	Lochaline White Sandstone Formation
Zig Zag Chalk	297, 313	Zig Zag Chalk Formation
Zig Zag Chalk Member	204, 205, 281, 300, 316, 317&332, 328, 341&342, 343&342	Zig Zag Chalk Formation
Zig Zag Chalk Formation	299, 313	Zig Zag Chalk Formation. Includes the Totternhoe Stone Member and Cast Bed as its basal unit.