Пондерс-Энд, графство Мидлсекс. На заводе London Jute Company. Из рис. 267, 268 видно, что этот колодец пробурен полностью, за исключением верхних 4 футов, которые имеют диаметр 5 футов и закреплены 9-дюймовой кладкой. Самая верхняя труба имеет диаметр 12 дюймов, уменьшающийся до 9 дюймов, затем до 8 дюймов, и заканчивается 6-дюймовой скважиной без обсадки в мелу.
Пройденные пласты:
Alluvium, 6 feet;— Feet. In.
Clay and Mud 3 6
Peat 2 6
Sand and Shingle (Gravel). 7 0
London Clay, 15 feet;—
Blue Clay 8 0
Sandy Clay (basement bed?) 7 0
Reading Beds, 491⁄2 feet;—
Dead Sand 10 0
Mottled Clays 22 0
Sand and Metal (pyrites?) 1 0
Sandy Clay 3 0
Sand and Pebbles 4 0
Dead Sand 1 6
Dead Sand and Pebbles 1 0
Sand and Pebbles 7 0
Thanet Sand (?), 35 feet;—
Green Sand 27 0
Dead Sand 8 0
To Chalk 112 6
In Chalk 290 6
Total 403 0
Вода в этом колодце переливается через край.
Фрешуотер, остров Уайт. Колодец (рис. 269, 270), пройденный на Голден-Хилл для правительства Ее Величества. Диаметр ствола составляет 4 фута 6 дюймов, кирпичная кладка толщиной 9 дюймов; в верхней части колодца имеется 3 фута кладки на цементе, а в нижней — 3 фута 9 дюймов. Через каждые 5 футов идут четыре ряда на цементе, внутренняя кладка — четыре ряда на цементе через каждые 10 футов. Буровая скважина по всей длине облицована трубами диаметром 6, 5 и 4 дюйма соответственно.
Рис. 269, 270. Колодец во Фрешуотере, остров Уайт.
Увеличенное изображение (296 кБ)
Уинчфилд, графство Гэмпшир. Колодец (рис. 271–273) на пивоварне Messrs. W. Cave and Son. Ствол над креплением стенок облицован железными цилиндрами, в которые выведена буровая труба.
Рис. 271–273. Колодец в Уинчфилде, графство Гэмпшир.
Увеличенное изображение (137 кБ)
Пройденные пласты:
Feet.
Made Earth, Soil, Gravel, Blue Clay
and Dead Sand
350
Dark Sandy Clay 3
Black Pebbles 2
Coloured Clay 5
Stone (septaria?) 2
Coloured Clay 22
Coarse Shifting Sands 7
Total 391
Следующая таблица, составленная на основе правительственных мемуаров и других надежных источников, содержит в сжатом виде наиболее важные сведения, касающиеся колодцев и пробных буровых скважин, расположенных в пределах географической области, известной как Лондонский бассейн.
В первом столбце указано название места, где расположен колодец, во втором — графство, а в третьем — точное местоположение. Были использованы следующие сокращения: B. — Бедфордшир; Berks — Беркшир; Bucks — Бакингемшир; E. — Эссекс; H. — Гэмпшир; Herts — Хартфордшир; K. — Кент; M. — Мидлсекс; S. — Суррей.
O.D. означает «выше ординара артиллерийского ведомства»; T. — «выше отметки высокого уровня Тринити».
PARTICULARS OF WELLS.
Name of Place. County. Locality. Depth.
of
Shaft. of
Bore. in
Tertiary
Strata. in
Chalk. to Water
from
Surface.
feet. feet. feet. feet. feet
Remarks.
Abridge E. Brewery 100 190 290 — 30
London Clay, 280 feet.
Acton M. Mr Engleheart’s — — 284 119 12
Ditto „ Mr. Wood’s — — 315 135 40
Ditto, East „ Mr. Davis’s — — 267 68
Albany Street „ London — — 182 125 —
100 feet O.D.
Aldershot Place H. — — — — 194 — —
260 feet O.D.
Ditto „ — — — — 148 691⁄2 —
245 feet O.D.
Amwell End Herts. New River Company 72 3473⁄4 36 3833⁄4 —
Yield about 2,500,000 gallons a day.
Arlesey B. Asylum 100 365 7 120 —
233 feet O.D.; water rises into shaft; yield 2640 gallons an hour.
Ash S. S.W. Railway Station — 600 370 230 —
290 feet O.D.
Bank of England M. London 137 1971⁄2 2341⁄2 100 88
About 27 feet T.; yield, 35 gallons a minute.
Bagshot S. Orphan Asylum 123 523 646 — —
Last 192 feet London Clay.
Balham Hill „ Near Clapham Common — — 347 — —
Last 40 feet Thanet sands.
Barking E. Byfron’s 140 — 140 — 30
Bottom in hard pebbles.
Barnet, East Herts. Lion’s Down 122 270 162 230 130
Shaft half steined, half iron cylinders.
Ditto, New „ Near Railway Station 137 302 159 280 130
Battersea S. Jones’s Works 249 — 249
Ditto „ Beaufoy’s Works 240 — 240 — —
Yield said to equal 15,000 gallons a day.
Bearwood Berks. Mr. Walters’s — — 350 15
Beaumont Green Herts. Near Cheshunt 1831⁄2 — 1261⁄2 57
Belleisle M. Pashes and Co.’s — — 185 118 118
Berkeley Square „ London 160 156 224 92 80
Bermondsey S. Crimscott Street — — 120 — —
9 feet O.D.; yield plentiful.
Ditto „ Donkin’s Works — 232 911⁄2 1401⁄2 16
Yield 30 gallons a minute.
Berry Green Herts. Hadham 40 20 60 — 8
Bexley K. Brickfield 65 110 1291⁄4 453⁄4 60
Bishop Stortford Herts. Waterworks 160 140 1161⁄2 1831⁄2 140
Supply 10,000 gallons a minute.
Ditto „ Hockerill 85 125 90 120 78
Good supply.
Ditto „ New Road 77 — 56 21
Blackfriars M. Apothecaries’ Hall — — 218 76
Blackheath K. Near Enfield Terrace — — 109 30
Boston Heath „ Near Woolwich — — 130 70
Bow M. Starch Works 176 148 174 150
Boxley Wood K. Near Maidstone 3861⁄2 2131⁄2 3 600 —
382 feet T.; last 781⁄2 feet in chalk, marl, and gault.
Braintree E. Near Pod’s Brook 55 190 228 7 216
Yield, 11,500 gallons an hour.
Brentford M. Brewery 30 338 315 53 5
Bromley K. Gas Works 50 120 150 20 —
Supply abundant.
Ditto „ Widmore Kiln 52 98 140 10
Ditto „ Ditto 55 85 120 10 61
Ditto „ Tylney Road 77 85 137 25
Ditto „ Waterworks — — 70 180 —
Yield, 500 to 600 gallons a minute.
Broxbourne Herts. — — 84 — 84 6
Water overflowed.
Bushey „ Near Watford 142 24 145 21
Camberwell S. The Grove — — 208 3001⁄2 90
Camden Station M. L. and N.W. Railway 180 220 234 166 150
100 foot O.D.
Camden Town M. Pickford’s — — 215 82 120
Good supply.
Ditto „ Whitaker’s Brewery 235 75 210 90 190
Canterbury K. Orphan Asylum — — 145 — 120
Caterham S. Waterworks — — 89 349 —
709 feet T.; through chalk, and 39 feet into upper greensand.
Chelmsford E. Moulsham 200 368 366 202 76
Water overflowed at first.
Cheshunt Herts. New River Company 144 27 1071⁄2 631⁄2 120
Yield, 702,000 gallons a day.
Ditto „ Theobald’s Park 71 1311⁄2 1211⁄2 81 65
Chiswell Street M. Whitbread’s Brewery 183 150 183 150 132
Chiswick „ Griffin Brewery 204 200 297 107 —
Yield, 14 gallons a minute.
Ditto „ Lamb Brewery 203 194 293 104
Ditto „ Ditto 8 339 297 50
Clewer Green Berks. Capt. Winterbottom’s 42 294 270 66
Ditto „ Wycombe Cottage 20 246 169 97
Colnbrook M. Paper Mills — — 207 175 —
Water found at 203 feet down.
Colney Hatch „ Asylum 137 193 189 141
Covent Garden „ Market 140 218 260 98 120
70 feet O.D.
Cricklewood „ Near Hampstead 225 85 291 19 110
157 feet T.
Croydon S. Well for Local Board 77 — 11 62 —
Yield 1,500,000 gallons a day.
Ditto „ New Well — — 15 137 111⁄2
Dartford Creek K. Paper Mills 34 49 33 50 —
Supply good.
Ditto „ Ditto 10 2401⁄2 30 2201⁄2 2
Denham Bucks. Tile House 110 85 67 128 85
Deptford K. Waterworks 27 — 14 13 —
20 feet O.D.
Dulwich S. Champion Hill — — 210 298
East Ham Level E. Beckton Gas Works 25 175 117 83 2
Edgware M. Mr. Day’s — — 290 45 40
Edgware Road „ The Hyde — — 101 37
Edlesborough Bucks. Well, near Mill — 301 — — 70
6-inch bore; through 50 feet of chalk marl to lower greensand.
Eltham K. Dr. King’s 46 — 46 — 17
Ditto „ The Moat 110 — 100 10
Ditto „ Mr. Tuck’s 44 123 1221⁄2 441⁄2 25
Ditto „ Well Hall — 107 104 3
Ditto Park „ — — — — 122 94 170
Enfield Lock E. Small Arms Factory 45 2391⁄2 1521⁄2 132 4
Epping „ Waterworks 275 129 400 4 260
Slow spring.
Erith K. Mineral Oil Company 166 — 146 20
Farnham S. Near Hale Farm 176 — 80 96
Fleet Street M. London, Shoe Lane 100 225 100 225
Fulmer Bucks. J. Kay’s 85 — 473⁄4 371⁄4 —
Through gravel and Reading beds.
Golden Lane M. Baths and Washhouses 158 — 1511⁄2 61⁄2 —
65 feet O.D.
Gravesend K. Church Street 10 234 120 124 8
Supply good and abundant.
Greenwich „ Brewery 22 158 80 100 11
Ditto „ East Street 189 — 159 30
Ditto „ Hospital Brewery 155 150 1241⁄2 1801⁄2 19
7 feet T.; supply 120 gallons a minute.
Hackney Road M. Wiltshire Brewery 96 3153⁄4 1523⁄4 259 80
Haggerstone „ Imperial Gas Works 1181⁄2 302 1641⁄2 256
Hainault Forest E. — — 165 — 110 55
Halstead „ The White Hart — — 170 30
Hammersmith M. Average of four wells — — 245 68 —
Yield, 16 gallons a minute.
Hampstead „ Lower Heath 320 130 378 72 —
Now not used.
Hampstead Road „ Eagle Brewery 138 94 146 86 147
Ditto „ Reservoir 244 — 152 92 106
77 feet T.
Hanwell „ Asylum 230 90 290 30 —
Water to surface.
Harrow „ Waterworks 1931⁄2 219 1581⁄2 254 125
226 feet O.D.
Haverstock Hill „ Orphan School 230 160 312 78 196
176 feet O.D.
Hayes „ Dawley Court 19 300 231 88 27
Hendon „ Mr. Booth’s — — 244 132 76
Highbury „ Brewery 104 210 180 134 95
Yield, 1000 gallons an hour.
Ditto „ New Park 136 113 199 50
Hoddesdon Herts. New River Company 52 234 241⁄2 2611⁄2 2
Holloway M. — — 140 200 240 100
Ditto „ City Prison — — 217 102
Ditto „ Hanley Road — — 67 13
Ditto „ Redcap Lane — — 210 90
Ditto „ Islington Workhouse 234 306 299 250
Hornsey „ Near Church — — 202 48
Ditto „ The Priory — — 225 — —
Horselydown S. Anchor Brewery 100 162 158 104 50
Hoxton M. — — 152 10 151 11
Hyde Park Corner „ St. George’s Hospital 200 1371⁄4 3191⁄4 18 100
50 foot O.D.; yield, 3300 gallons an hour.
Ickenham „ Public Well 64 80 64 80
Isle of Dogs „ Oil Mills 27 337 1241⁄2 2391⁄2 10
Isle of Grain K. Fort 180 140 320 — 20
21 feet O.D.
Isleworth M. Sion House — — 420 115 —
Water overflowed at the rate of 5 gallons a minute.
Ditto „ Mr. Wilmot’s — 327 327 — —
Water rose above surface.
Islington Green „ Webb’s Mineral Water Works — 320 176 144 200
Kensington „ Brewery — — 197 — —
16 feet T.
Ditto „ Britannia Brewery 100 170 270 — 88
Ditto „ Horticultural Society 200 201 317 84 100
60 feet O.D.
Ditto „ Workhouse — — 270 100
Ditto Gardens „ Serpentine 263 58 2631⁄4 573⁄4 105
60 feet O.D.; yield, 250 gallons a minute.
Kentish Town „ Waterworks 539 763 3241⁄2 6443⁄4 —
Through London clay, 236 feet; London tertiaries, 881⁄2 feet; chalk, 6443⁄4 feet; upper greensand, 133⁄4 feet; gault, 1301⁄2 feet; and into lower greensand (?), 1881⁄2 feet.
Kilburn „ Brewery 250 30 235 45 150
Kingsbury „ Brent Reservoir 101 139 132 108
Kingston-on-Thames S. Brook Street 90 380 371 99 —
25 feet O.D.; yield, about 44,000 gallons a day.
Knightsbridge M. — — 240 — 240 — 50
Lambeth S. Beaufoy’s Vinegar Works 100 275 201 174 —
Yield, 92 gallons a minute.
Ditto „ South Lambeth Road 25 166 187 4
Ditto „ Bethlehem Hospital 30 161 191 20 15
Ditto „ Lion Brewery, Belvedere Road — — 245 173 40
Ditto „ Duke Street, Street, Clowes & Sons’ 26 184 210
Lea Bridge M. Waterworks 118 — 100 18
Leicester Square „ Alhambra 150 195 244 101
Limehouse „ Johnson’s, Commercial Road 90 110 190 10
Ditto „ Brewery, Fore Street — — 1391⁄2
Liquorpond Street „ Reid’s Brewery 2221⁄2 40 136 1261⁄2 121
70 feet O.D.; yield, 277,200 gallons in 24 hours.
Long Acre „ Combe & Co.’s Brewery 263 228 223 268 —
70 feet O.D.; yield, 90 gallons a minute
Loughton E. — — — 535 324 211 90
No water from chalk.
Lower Morden S. On the Green 20 365 340 45 —
Water to surface.
Luton B. Waterworks 50 272 — 322
Maldon E. Waterworks 234 — 234 — —
Entirely through London clay.
Margate K. Cobb’s Brewery 31 243 — 374
Marylebone Road M. London; a Brewery 186 101 232 55 156
Mile End „ Mann’s Brewery 195 — 185 10
Ditto „ Charrington’s Brewery 204 — 202 2 103
331⁄2 feet T.; yield, 60,000 to 70,000 gallons a day.
Ditto Road „ City of London Union — — 175 10
Millbank „ Distillery 115 190 205 100 70
Level of T.
Ditto „ Westminster Brewery — — 225 70 —
51⁄2 feet T.
Mitcham S. Nightingale’s Factory — 211 189 22
Monkham Park E. Near Waltham Abbey 225 125 304 76 50
Mortlake S. Mortlake Brewery 30 288 287 31 50
Yield, 14,000 gallons a day.
Ditto „ Mr. Randell’s — 365 315 50
New Cross K. Naval School 50 130 125 55 60
Northolt M. Near Harrow 12 228 180 60 4
Notting Dale „ Near Notting Hill — — 244 12
Notting Hill „ Mr. Knight’s — — 230 200
Old Kent Road S. Welsh Ale Brewery — — 30 170 —
10 feet O.D.
Old Windsor Berks. Pelham Place — — 222 9
Ditto „ The Union 60 180 240 47
Orange Street M. Back of National Gallery 174 126 250 50 115
42 feet T.
Oxford Street „ Star Brewery 166 170 158 178
Peckham S. Marlborough House — — 100 123
Penge „ Palace Grounds 250 310 358 202 90
Pentonville M. Brewery, Caledonian Road 2191⁄2 — 2191⁄2 45 180
To chalk.
Ditto „ Prison 170 2001⁄2 2191⁄2 151
Pimlico „ Cubitt’s Works 188 — 188 — —
2 feet T.
Ditto „ Brewer Street 30 368 271 127
Ditto „ Simpson’s Factory — — 231 100 36
1 foot T.
Pinner „ Hatch End 140 — 60 80
Plaistow E. Odam’s Manure Works — — 1701⁄2 128
Ponders End M. London Jute Company 4 399 1121⁄2 2901⁄2 —
Water overflows.
Ditto „ Crape Works 20 42 62
Ditto „ Local Board (Speller) — — 106 961⁄2
Ditto „ Waterworks 23 181 97 107 —
43 feet T.
Pudsey Hall E. Near Canewdon 297 — 297 — —
Water abundant and good.
Ratcliffe M. Queen’s Head Brewery — — 160 200
Ditto „ Marine Brewery 16 236 150 102
Ditto „ Ravenhill’s — 137
Regent’s Park „ Colosseum 150 100 171 79
Ditto „ Mr. Day’s — — 184 216 80
Ditto „ Zoological Gardens 183 91 224 50 120
Yield, 90,000 gallons a day.
Richmond S. Old Waterworks — — 276 103
Ditto „ Star and Garter — — 416 76
Romford E. Ind, Coope, & Co. 155 — 145 10
Rotherhithe S. Brandram’s Works 30 222 107 145 27
Yield, 100,000 gallons in 12 hours.
Ditto „ Tunnel Flour Mills — — 125 135 —
15 feet O.D.; yield, 80 gallons a minute.
Ruislip M. Near “The George” 15 903⁄4 753⁄4 30 —
Water to surface.
Saffron Walden E. — — — — — 1000
Sandhurst Berks. Well at College — 603 — — —
Trial boring; chalk reached.
Sandwich K. The Bank 70 — 62 8 20
Sheerness „ Waterworks 300 84 384 — —
51⁄2 feet O.D.; yield, 10,000 gallons an hour.
Ditto „ Dockyard 330 125 455 — 53
Yield, 675 gallons an hour.
Shoreditch M. Truman’s Brewery 300 230 199 331 120
Yield, 71⁄2 gallons a minute.
Shorne Meade Fort K. Near Gravesend 112 — 771⁄2 341⁄2
Shortlands „ Near Bromley 59 150 109 100 61
Yield, 1000 gallons an hour.
Slough Bucks. Eton Union 28 103 107 24
Ditto „ Royal Nursery — — 94 171⁄2
Ditto „ Upton Park — — 1021⁄4 1701⁄4
Ditto „ Waterworks 117 — 90 27 7
Heading into chalk.
Smithfield M. Booth’s Distillery — — 230 70 70
Southend E. Waterworks 417 — 417 — 100
Old well.
Southwark S. Barclay’s Brewery 115 288 212 211 —
Level of T.; yield, 300 gallons a minute.
Ditto „ Guy’s Hospital 132 173 196 109 84
2 feet T.; yield, 33 gallons a minute.
Staines M. Ashby’s Brewery — — 369 154 —
Water to surface.
Stifford E. S.E. of Church 63 — 33 30
Stockwell Green S. Waltham’s Brewery 100 210 210 100 46
Yield, 33 gallons a minute.
Ditto „ Hammerton’s Brewery 25 186 211 154 —
Yield, 46 gallons a minute.
Stratford E. Great Eastern Works 56 344 106 294
Ditto „ Savill Bros.’ Brewery 1121⁄2 — 1091⁄2 3
Ditto „ Langthorn Chemical Works 60 395 132 323 —
Supply abundant.
Streatham S. The Common 100 185 285
Sudbury M. London and North-Western Rail. Station 200 — 120 80
Tottenham „ Warne’s Works — — 147 104
Ditto „ Long Water — — 1491⁄2 1011⁄2
Ditto „ Tottenham Hall — 253 153 100
Tottenham Court Road „ Meux’s Brewery 188 622 156 654 —
85 feet O.D.; yield, 121⁄2 gallons a minute.
Tower Hill „ Royal Mint 1951⁄2 202 1951⁄2 202 80
Trafalgar Square „ London 168 228 248 148 —
Yield, 450 gallons a minute.
Upchurch K. Burntwick Island — 236 236
Ditto „ Milford Hope Marshes — 304 210 94 —
Good supply at bottom.
Upper Thames Street M. City of London Brewery 90 415 210 295 10
Uxbridge „ The Dolphin 121 — 811⁄2 391⁄2 3
Ditto „ Near Market Place — — 104 28 151⁄2
Ditto „ Page’s Lane 98 — 98
Ditto „ Town Well — — 109 30 19
Ditto „ Near “King’s Arms” 24 84 108 — 19
To chalk.
Ditto „ New Year’s Green Farm 63 — 63 — 51
Ditto „ Hurdle Yard 78 391⁄2 78 391⁄2
Ditto „ Near Meeting House 411⁄2 1091⁄2 115 36 39
Ditto „ The Union 51 162 175 38 29
Vauxhall S. Burnett’s Distillery 140 186 224 102 55
Yield, 80 gallons a minute.
Waltham Abbey E. Brewery 164 — 160 4 —
Water supply from bed of sand.
Walthamstow Marsh „ East London Waterworks — — 152 140 —
15 feet T.
Wandworth S. Young & Bainbridge’s 170 164 274 60 45
Yield, 10 gallons a minute.
Ditto „ Prison — — 357 1261⁄2 80
Yield, 27 gallons a minute.
Ditto „ County Asylum — — 331 6 30
Westbourne Grove M. Hippodrome 240 67 300 7
West Drayton „ Victoria Oil Mills 12 274 186 100 —
Water overflowed.
Ditto „ Vitriol Works — — 1331⁄2 451⁄2
Ditto „ Drayton Mills 3 146 149 — —
To chalk.
West Ham E. Mr. Tucker’s — — 132 306
Ditto „ Union — — 110 55
West India Dock M. South of Export Dock — — 120 240
Westminster „ Artillery Brewery — — 230
Ditto „ Chartered Gas Works — — 225
Ditto „ Vickers’ Distillery 116 184 249 51 70
Yield, 94 gallons a minute.
Ditto „ Swallow Street — — 210 — 60
Whitechapel „ Furze’s Brewery 130 218 248 100
Ditto „ Smith’s Distillery 106 264 210 160 36
36 feet T.
Ditto „ Smith, Druce, & Co.’s 1411⁄2 — 1411⁄2 — 85
39 feet T.
Willesden „ Mr. Kilsby’s — — 273 97 30
Wimbledon S. Convalescent Hospital 200 367 537 30 50
Ditto, New „ Opposite “White Hart” — — 193 75
Windsor Berks Clower Lodge 40 175 175 40
Ditto „ Royal Brewery 72 — 72 — —
Through clay and running sand to chalk.
Ditto „ Jennings’ Brewery — — 30 500 12
Winkfield Plain „ Captain Forbes’ — — 304 126 70
Witham E. — — — — 306 — 5
Woodley Lodge Berks. 3 miles east of Reading 95 35 130
Woolwich K. Well of Arsenal — — 541⁄2 3111⁄2 37
Ditto „ Paper Factory — 550 51⁄2 5441⁄2 —
Yield, 650 gallons a minute.
Ditto „ Dockyard — 608 20 588 70
Yield good.
Wormley Herts. Nunsbury 26 761⁄2 801⁄2 22 —
Water overflows.
Ditto „ West End 85 1501⁄2 72 631⁄2 62
Wormwood Scrubbs M. — — — — 250 116 5
ГЛАВА VIII. ТАБЛИЦЫ И РАЗЛИЧНАЯ ИНФОРМАЦИЯ.
Следующая табличная форма показывает порядок залегания различных слоистых пород с их обычной мощностью.
Groups. Strata. Thickness
in Feet.
RECENT 1 Modern Deposits.
PLEISTOCENE 2 Drift and Gravel Beds 20 to 100
3 Mammaliferous Crag 10 to 40
PLIOCENE 4 Red Crag 30
CAINOZOIC, OR 5 Suffolk (Coralline) Crag 30
TERTIARY. MIOCENE 6 Faluns (Touraine) Molasse Sandstones 6000
7 Hempstead Series 170
Upper 8 Bembridge Series 110
9 Headon Series 200
EOCENE Middle 10 Barton Beds 300
11 Bagshot and Bracklesham Series 1200
Lower 12 London Clay and Bognor Beds 200 to 520
13 Woolwich Beds & Thanet Sands 100
14 Maestricht Beds 110
15 Upper Chalk 300
16 Lower Chalk and Chalk Marl 400
CRETACEOUS 17 Upper Greensand 130
18 Gault 100
19 Speeton Clay 130
20 Lower Greensand 250
WEALDEN 21 Weald Clay 150
22 Hastings Sands 600
PURBECK 23 Purbeck Beds 150
UPPER 24 Portland Rock and Sand 150
OOLITE 25 Kimmeridge Clay 400
26 Upper Calcareous Grit 40
MESOZOIC, OR MIDDLE 27 Coralline Oolite 30
SECONDARY. OOLITE 28 Lower Calcareous Grit 40
29 Oxford Clay 400
30 Kellaways Rock 30
31 Cornbrash 10
32 Forest Marble and Bradford Clay 50
LOWER 33 Great Oolite 120
OOLITE 34 Stonesfield Slate 9
35 Fullers’ Earth 50 to 150
36 Inferior Oolite 80 to 250
37 Upper Lias Shale 50 to 300
LIAS 38 Marlstone and Shale 30 to 200