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

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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 topic 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.