Aldridge, R.J., Siveter, David J., Siveter, Derek J., Lane, P.D., Palmer, D. & Woodcock, N.H. 2000. British Silurian Stratigraphy. Geological Conservation Review Series No. 19, JNCC, Peterborough, ISBN 1 86107 4786. The original source material for these web pages has been made available by the JNCC under the Open Government Licence 3.0. Full details in the JNCC Open Data Policy
Tables
(Table 1.1) GCR sites arranged by palaeogeographical setting and stratigraphical age
Bold typeface denotes a basal boundary stratotype for the global standard stratigraphy.
| Llandovery | Wenlock | Ludlow | Přídolí | |
| Midland Valley | Gutterford Burn
Birk Knowes Roughneck Quarry Blair Farm Penwhapple Burn Woodland Point |
Lyne water and Lynslie Burn
Ree Burn–Glenbuck Loch Knockgardner |
||
| Southern Uplands | Old Cambus Quarry
Thornylee Quarry Grieston Quarry Dob's Linn |
Balmae Coast
Meikle Ross |
||
| Lake District Basin | Brow Gill Beck
Skelghyll Beck Spengill Yewdale Beck |
Brathay Quarries
River Rawthey Torver–Ashgill Arcow Quarry |
Tebay Cuttings
Benson Knott Hills Quarry |
The Helm |
| Welsh Basin | Meifod
Craigyfulfran Rheidol Gorge Caban Côch Aberarth-Morfa |
Penstrowed Quarry
Ty Mawr |
Ty'n-y-Ffordd Quarry
Clogau Quarry Dinas Brân |
|
| Welsh Basin
Margin |
Banwy River
Buttington Brickworks Cwm Clyd Quarry Scrâch Track Trefawr Track Cwm-Coed-Aeron Coed Glyn Moch Track Fron Road Cilgwyn-Ydw Valley Gasworks Lane Marloes |
Trewern Brook Buffington Brickworks Banwy River Trecoed–Castle Crab Dulas Brook Coed-mawr
Pen-cerig River Irfon Sawdde Gorge Wernbongam Marloes Freshwater East (south) |
Beacon Hill
Meeting House Quarry Mithil Brook and Cwm Blithus Sawdde Gorge |
Lower Wallop Quarry
Capel Horeb Quarry Little Castle Head Albion Sands and Gateholm Island |
| Midland Platform | Hope Quarry and Hope Brook
Hughley Brook Hillend Farm Wistanstow Gullet Quarry Damery Bridge Cullimore's Quarry |
Buildwas River Section
Lincoln Hill Daw End Railway Cutting Farley Road Cutting Whitwell Coppice Hay Head Quarries Hughley Brook Easthope-Harley Hill Longville-Stanway Road Section Wren's Nest Eaton Track Burrington Dolyhir Quarries Little Hill Scutterdine Quarry Linton Quarry Hobbs Quarry Cwm-Ton Area Cilwrgi Quarry Brinkmarsh Quarry Buckover Road Cutting Rumney River Rumney Quarry Pen-y-Lan Quarry Moons Hill Quarry |
Turner's Hill
Upper Milliehope View Edge Mocktree Quarries The Whiteliffe Church Hill Quarry Wigmore Road Deepwood Mary Knoll Valley Pitch Coppice Bow Bridge Burrington Farm Stream Section Sunnyhill, Mary Knoll Valley Goggin Road Deer Park Road Elton Lane Aymestrey Quarries Woodbury Quarry Perton Road and Quarry Gurney's Quarry Linton Quarry Longhope Hill Wood Green Tites Point Brook House |
Brewin's Canal Ludford Lane and Ludford Corner |
(Table 4.1) Lithological log of the Brinkmarsh Formation at Buckover Road Cutting, Tortworth Inlier (after Curtis and Cave, 1964).
| Bed no. | Lithology | Thickness (m) |
| (18) | Hard yellow current-bedded, fine-grained calcareous sandstone, weathering to a brown laminated rottenstone; contains abundant crinoid ossicles. | 0.45 |
| (17) | Silty mudstone with some silty sandstone bands; mainly green below and red and green above. | 1.21 |
| (16) | Purplish-red shaley mudstone, with occasional bands of hard, green, fine-grained sandstone and a thin layer of green clay at the base. | 1.87 |
| (15) | Banded green and purplish-red silty mudstone, with some hard sandy siltstone bands. | 2.59 |
| (14) | Banded green and purplish-red silty mudstone, with occasional bands of hard, fine-grained sandstone, and a few pale green clay partings. | 1.67 |
| (13) | Green siltstone, with some sandier bands showing fine current bedding and containing rounded masses with curved bedding. | 1.21 |
| (12) | Brown sandy siltstone with some curved bedding; abundant fossils. | 0.91 |
| (11) | Banded green and purplish-brown silty mudstone. | 0.60 |
| (10) | Yellowish-green siltstone, with bands of harder siltstone. Bands of yellowish-brown, fine-grained calcareous siltstone up to 30 cm thick, sometimes highly fossiliferous, most abundant in middle and upper part. Some reddish-brown and purplish streaks towards base and top. | 5.48 |
| (9) | Purplish-red mudstone and silty mudstone, with layers of slightly harder siltstone and two 10 cm bands of fine-grained sandstone. | 3.04 |
| (8) | Banded purplish-red and drab green mudstone and sandy mudstone with a band | |
| of green argillaceous sandstone, 17 cm thick at base. | 1.37 | |
| (7) | Purplish-red mudstone, with green streaks, and occasional bands of green mudstone and sandy mudstone up to 30 cm thick. Abundant fossils in bed of purple mudstone apparently about 1.8 m above base. | 10.05 |
| (6) | Hard, purple and purplish-grey argillaceous and silty limestone, occurring in lumpy, irregular beds with clay partings. The highest 60 cm is most massive and regularly bedded. Drusy cavities, up to 5 cm across, contain small crystals of white and pink celestine. About 60 cm above base is band of purplish-blue clayey mudstone 23 cm thick. | 3.66 |
| (5) | Purple and purplish-red mudstone with occasional calcareous nodules; in the lower part a few seams of nodular, lumpy limestone up to 23 cm thick. | 2.74 |
| (4) | Purplish-red mudstone, slightly calcareous towards the base, with green limestone and mudstone band, 7 cm thick, at base. | 3.95 |
| (3) | Purplish-red mudstone with occasional thin green and purplish-blue bands. Nodular lumps of purple limestone, up to about 10 cm thick, in lower part. | 2.42 |
| (2) | Purplish-red mudstone with an occasional calcareous nodule in upper part, and with occasional thin green and purplish-blue bands and streaks. | 7.91 |
| (1) | Soft purplish-red mudstone with occasional very thin green partings. | 4.50 |
(Table 4.2) Stratigraphy of the East Mendips Inlier (after Hancock, 1982).
| Unit | Lithology/fossils | Thickness (m) |
| 11. | Top andesite. | |
| 10. | Agglomerate, contains well-rounded boulders up to 1 m in matrix of tuff. | 18 |
| 9. | Upper andesites, basal 2 m flow has reddened top, though possibly also has pillowing, followed by massive lava. | 70 |
| 8. | Tuff and bedded agglomerate, include red and locally blue-black mudstones, with angular and some rounded boulders up to 23 cm in the agglomerates. | 20–29 |
| 7. | Main andesites, abruptly overly unit 6, top reddened and eroded below unit 8. | 90–135 |
| 6. | Tuffs with red and green mudstones, finely interbedded, some tuffs with graded bedding and evidence of cross-bedding. | 18 |
| 5. | Andesites. | 50 |
| 4. | Tuffs and sandy tuffs, with fragments up to 2.5 cm, showing graded bedding, together with red and green mudstones, locally fossiliferous. Shelly fauna comprises mainly brachiopods, e.g. Craniops sp., Salopina conservatrix, 'Camarotoechia' tripartita, 'Camarotoechia' aff. llandoveriana, Rhynchotreta cuneata and Sphaerirhynchia davidsoni. Also remains of trilobites, bivalves, gastropods and ostracods (see also Reynolds, 1907; Woodward et al., 1909). | 105–135 |
| 3. | Andesites, no surface exposure, possibly absent in eastern part of inlier. | 30 |
| 2. | Tuffs, fine-grained, no surface exposure, possibly absent in eastern part of inlier. | 34–60 |
| 1. | Shales and siltstones, with brachiopod-dominated shelly fauna, including Salopina conservatrix, 'Camarotoechia' tripartita, 'Camarotoechia' llandoveriana, Eocoelia angelini, Eoplectodonta duvalii, Coolinia applanata, Resserella canalis, Atrypa reticularis, ?Isorthis clivosa, Eospirifer radiatus and Protochonetes sp.. Trilobite, ostracod, bivalve, coral and Tentaculites remains also occur in these Wenlock Shale sediments (see also Reynolds, 1907; Bassett, 1974a). | 95+ |