View source for 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 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==
{|class="wikitable" style="background-color:#F0F8FF; margin:auto;"
| '''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.
|}

[[category:Chalk of the UK | 06]]