INTRODUCTION. 
Tabular View of the Silurian Strata. 
30 
Passage-beds, __Tile- 
stones, and Down- 
ton Sandstones 
Upper Ludlow Rock 
LuDLOW 
Group 
Aymestry Limestone 
£ 
sl 
ze / Lower Ludlow Shale 
— 
nA | 
[a= 
ica } 
Aa | 
A 
i=) 
/ Wenlock Limestone 
| Wentock | Wenlock Shale 
Group \ 
Woolhope Beds. 
Denbighshire and 
. Tarannon Slates 
Upper Llandovery 
{ A series of greenish-grey shales, containing lenticular pockets of 
hard grey grit ; with abundance of Crustacean and Plant reniaius, 
Lingula cornea, and Fish fragments. 
Thin-bedded yellowish sandstones, with Crustacean (Poecilopod), 
Plant, and Fish remains,! Lingula cornea? var. minima (Sow.), 
Orthoceras, Platyschisma helicites, Modiolopsis, Beyrichie, &c. 
Loc. Ledbury, Ludlow, Downton, Kington, Lesmahago. 
Yellowish, greenish, and grey argillaceous sandy mudstone, with 
calcareous lenticular and nodular masses, and many species of 
Brachiopoda, Chonetes lata, Rhynchonella nucula, Discina rugata, 
Orthis lunata, and O. elegantula, with Orthonota amygdalina, 
Serpulites longissimus, &c. Loc. Whiteliffe, Ludlow, Malvern, 
Longhope. 
ec 7 cs 
r Grey, pale-yellow, or brown shales, with bands of argillaceous lime- 
stone in the upper part, and containing great numbers of 
Strophomena filosa, St. depressa, Rhynchonella nucula, Rh. 
navicula, and Lingula Lewisii ; the lower portion also consisting 
of beds of argillaceous limestone, filled with Pentamerus 
Knightii, P. galeatus, Strophomena euglypha, Atrypa reticu- 
laris, Lingula striata, with Proetus Stokesti, Phacops caudatus, 
&c. Loc. Whitcliffe, Aymestry, View Edge, Onibury. 
Yellowish-grey, hard flaggy and nodular argillaceous shales, with 
occasional beds of impure limestone, and containing concre- 
tionary nodules of fossiliferous blue limestone; the upper 
portion contains Lingula lata, Graptolites Ludensis, and Car- 
diola interrupta ; in the middle portion PAragmoceras and 
Lituites occur ; and in the lower Phacops, &c. Loe. Vinnal 
Hill, Mocktree, Stokes Wood, Onibury. 
Argillaceous or semi-crystalline limestone, and lenticular masses of 
concretionary matter, abounding in organic remains, especially 
Crinoidea, Coelenterata, Crustacea, and Brachiopoda; Spirifera 
plicatella, Sp. elevata, Athyris tumida, Atrypa reticularis, 
Rhynchonella Stricklandii, Rh. borealis, Rh. Wilsonii, Orthis 
rustica, Strophomena antiquata, Discina Forbesii, and Obolus 
Davidsonii, being most typical. Loc. Wenlock Edge, Dudley, 
Walsall, May Hill, &c. 
SSS Sa aN SS SS 
Hard flaggy beds and thin shales, in places slaty, with occasional 
beds ‘of sandstone; fossils resembling those above. Loc. 
Wenlock, Dudley, Walsall, Malvern, Usk, &c. 
in veins, and occasional bands of argillaceous nodules, &c., also 
sandy beds in places; Idlenus (Bumastus) Barriensis, Orthis 
Davidsoni, O. elegantula, var. Loc. Woolhope, Walsall, &c. 
Thin-bedded flaggy sandstones and slaty beds; fossils compara- 
tively rare in places, especially in the gritty beds. Loe. Flint- 
Dark-grey, semi-indurated limestone, with much carbonate of lime 
shire, Denbighshire, Tarannon river-banks, &c. 
bands of limestone; rich in organic remains, especially Brachio- 
poda ; Pentamerus oblongus, Rhynchonelle, Orthides, &e. Loe. 
May Hill, Shelve, Tortworth, &c. 
Grey and yellowish sandstones (occasionally conglomerates), with 
system, as a whole, is characterised by Invertebrata only, Mr. D. Page, in his Manual, has included the Lud- 
