{ {| 26 Upper Calcareous Grit | 40 { MIDDLE {| 27 Coralline Oolite | 30 { 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 { {| 39 Lower Lias and Bone Beds | 100 to 300 { | | { TRIASSIC, or {| 40 Variegated Marls or Keuper | 800 { NEW RED {| 41 Muschelkalk | { SANDSTONE {| 42 Red Sandstone or Bunter | 600 | | | | PALÆOZOIC, OR PRIMARY. | | | { PERMIAN or {| 43 Red Sand and Marl | 50 { MAGNESIAN {| 44 Magnesian Limestone | 300 { LIMESTONE {| 45 Marl Slate | 60 { {| 46 Lower Red Sandstone | 200 { | | { {| 47 COAL MEASURES |3000 to 12,000 { CARBONIFEROUS{| 48 Millstone Grit | 600 { {| 49 Mountain Limestone | 500 to 1400 { {| 50 Limestone Shales | 1000 { | | { DEVONIAN or {| 51 Upper Devonian }| { OLD RED {| 52 Middle Devonian }|3000 to 8000 { SANDSTONE {| 53 Lower Devonian and Tilestones }| { | | { SILURIAN | | { {| 54 Ludlow Rocks | 2000 { UPPER {| 55 Wenlock Beds | 1800 { {| 56 Woolhope Series | 3050 { | | { MIDDLE | 57 Llandovery Rocks | 2000 { | | { {| 58 Caradoc and Bala Rocks | 5000 { LOWER {| 59 Llandeilo Rocks | 4000