394 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [Feb. 29, 



plates in position. Plesiosaurus Hawlcinsii ; the vertebral, column, 

 ribs, and humeri; and fifty vertebras in position. 



The Ostrea and lower Saurian beds at Binton, Brockeridge, and Street 

 are overlaid by clays and laminated shales, containing Ammonites 

 planorbis. As these beds form a most important horizon in the Lias- 

 formation, and have a wide geographical distribution in England, 

 France, and Germany, they require to be defined with accuracy, 

 especially as some authors are of opinion that the true Lias com- 

 mences with this zone of life. 



The relation of the Am. planorbis shales to the Saurian beds 

 below is extremely well exposed in the Railway-cutting at Uphill, in 

 the quarries at Street, in the Binton and Wilmcote quarries in War- 

 wickshire, at Brockeridge Common in Gloucestershire, and at Stren- 

 sham, Worcestershire, and to the Am. Bucklandi or Lima beds above 

 in the sections at Saltford near Bristol, Penarth Head near Cardiff, 

 and Pinhay Bay near Lyme Regis. 



The following section of the beds at Binton was made by Mr. 

 Robt. Tomes, of Welford Hill, near Stratford-on-Avon, from a quarry 

 now abandoned. A similar exposition, however, is seen in the quarry 

 worked near the former, and the various beds of which I examined 

 with Messrs. Tomes and Kershaw. 



Section of the Zones of Ammonites planorbis and Avicula contorta, at 

 Binton, Warwickshire. 



Lithology. Thickness. Organic Remains ; and Local 



No. ft. in. Names op the Beds. 



1. Light-coloured limestone 6 " Top rock " or " Whites." 



2. Light-coloured clay 2 6 



3. Argillaceous limestone 3 "Top Liveries." Ichthyosaurus; on 



the upper surface Insects. 



4. Light-coloured clay 7 



5. Argillaceous limestone 3£ " Top Liveries" (lower). Insects; Am- 



monites Johnstoni, Sow. 



6. Clay 1 1 



7. Greyish limestone 6 "Extra rock." " Thick paving-bed." 



No fossils. 



8. Clay 3| 



9. Greyish limestone. Thin and " Quarters." 



irregular when covered by 



the preceding 2 in. to 3 



10. Clay . 8J 



11. Greyish limestone. A con- "Ribs." Insects. 



stant bed 3£ 



12. Clay 5f 



13. Limestone 3 "Paving-stone." A few Insects and 



Pholidophorus StricJdandi, Ag. 



14. Clay 10J 



15. Limestone 3^ " Bottom rock." More Insects here 



than in all the other beds collectively. 



16. Clay 8 



17. Limestone 3 in. to 6 "Hoggs." Tetragonolepis angulifer, 



Ag. (Warwick Mus.) 



18. Strong hard clay 3^ 



19. Argillaceous limestone; im- "Ruskin." No fossils in this quarry. 



perfect stone 3 



