SILURIAN, DEVONIAN, AND CARBONIFEROUS ROCKS NEAR LONDON. 295 
» 1. Ischadites Kcenigii, Minch. 
( 2. Taxocrinus, sp. 
| 3. Periechocrinus moniliformis, Mill 
. 4. Tentaculites ornatus, Sby. 
. 5. Phacops eaudatus Briinn. 
6. Orthis canaliculata, Dalm. 
7. elegantvla , Dalm. 
8. Meristella tumida, Dalm. 
9. Cyrtia exporrecta, Wahl. 
10. Spirifera elevota , Dalm. 
11. plicatella, Linn. 
12. Athyris, sp. 
13. Crania implicata, Sby. 
14. Rhynchonella cuneata , Dalm. P 
or deflexa, Sby. 
‘ 15. Atrypa reticularis, Linn. 
16. Pentamerus galeatus, Dalm. 
17. linguifer, Sow. 
18. Strophomena euglypha , Dalm. 
19. reticulata , McCoy. 
20. depressa, Dalm. 
21. rhomboidalis, Wahl. 
22. antiquata , Sby. 
23. Chonetes, sp. 
24. Leptcena sericea , Sby. 
.25. transversalis, Dalm. 
1 26. Pterinea, sp. 
27. Mytilus mytilimeris , Conr. 
28. Ctenodonta, sp. 
29. Orthonota rigida , Sby. 
• 30. Euomphalus rugosus, Sby. 
( 31. Orthoceras attenuatum , Sby. 
. 33 . sp. 
(33. angvdatum , Wahl. 
It may be asked what has become of some 20,000 feet of 
strata ranging from the Neocomian down to the top of the 
Upper Devonians, all the Coal Measures, Triassic, Jurassic, and 
Wealden series, being absent between Ware and London. No 
greater unconformity is known in the British Islands, or was 
suspected here until the boring for water by the New Biver 
Company revealed these grey argillaceous Silurian shales and 
fossils, dipping probably to the south, at an angle of 40°. The 
Jurassic Bocks must have thinned away west of Ware, Turnford, 
and London, against yet resting upon this unseen and hitherto 
unknown Silurian range. Whether all the should-be super- 
incumbent strata named were ever present, and subsequently 
denuded, during elevation, we know not ; but the presence of the 
Upper Devonian strata at Turnford, with their characteristic 
fauna, and at a lower geographical level, tends to show consider- 
able movement. 
At Turnford and at Tottenham Court Boad the red fissile 
shales contain the same fossils — Spirifera disjuncta , Pterinea , 
and Rhynchonella , &c., being common to both places, thus 
I. Protozoa 
II. Echinodermata 
III. Annelida 
IV. Crustacea 
V. Mollusoa-Brachiopoda 
„ C ON CHIEER A 
„ Gasteropoda . 
„ Cephalopoda . 
