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PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [Feb. 29, 



February 17, 1860. 



Annual General Meeting. 

 [For the Reports of the Council, &c., see the commencement of this volume.] 



February 29, 1860. 



"William Smith, Esq., C.E., Salisbury Street, Adelphi ; and C. A. 

 Sanceau, Esq., F.C.S., Blackpool, Lancashire, were elected Fellows. 



The following; communication was read : — 



On the Zone of Avicula contorta, and the Lower Lias of the South 

 of England. By Thomas Wright, M.D., F.E.S.E., and F.G.S. 



Contents. 

 § I. Introduction. 



Boundary of the Avicula contorta beds and the Lower Lias. 



§ II. The Zone of Avicula contorta. 

 Section at Garden Cliff. 

 Section at Wainlode Cliff. 

 Section at Coombe Hill. 

 Section at Bushley. 

 Section at Aust Cliff. 

 Section at Penarth Cliff. 

 Section at Uphill. 

 Section at Watch et. 

 Section at Beer-Crocomb. 



§ III. The Lower Lias. 



Section at Culverhole. 



Section at Abbot's Part, Staf- 

 fordshire. 



Sections in Warwickshire, at 

 Wilmcote, &c. 



Fossils of the Avicula contorta 

 zone. 



Equivalent of the Bone-bed in 

 the North of Ireland. 



1. The Zone of Ammonites pla- 



norbis. 



Sections in Somersetshire, at 

 Street, &c. 



Sections in Worcestershire, Glou- 

 cestershire, and Warwickshire, 

 at Brockeridge, Strensham, 

 Binton, &c. 



Lithology of the Am. planorbis 

 beds, at Brockeridge, Up- 

 Lynie, Pinhay, &c. 



Localities of the Am. planorbis 

 beds. 



Fossils of the Am. planorbis 

 beds. 



2. The Zone of Ammonites Buck- 



landi, or Lima-beds. 



In Gloucestershire and Somer- 

 set, at Saltford, &c. 



At Lyme Regis. 



On the coast of Glamorganshire. 



Fossils of the Am. BucMandi 

 zone. 



3. The Zone of Ammonites Turneri. 

 In Gloucestershire and War- 

 wickshire. 



In Dorsetshire. 



Fossils of the Am. Turneri zone. 



4. The Zone of Ammonites obtnsus. 

 In Gloucestershire and War- 

 wickshire. 



In Dorsetsliire. 



Fossils of the Am. obtusus zone. 



5. The Zone of Ammonites oxy- 



notus ; in Gloucestershire, 

 Dorsetshire, and Yorkshire. 

 Fossils of the Am. oxynotus 

 zone. 



6. The Zone of Ammonites raricos- 



tatus ; at Cheltenham, Lyme 



Regis, and Robin Hood's Bay. 



Fossils of Am. raricostatus zone. 



§ IV. Conclusion. 



§ I. Introduction. — Although the Liassic formation of England 

 and Wales attains a development equal in many respects to that of 



