Zoological Society. 4 1 7 



from these evidences he concludes that the principal lines of- fracture 

 along the margin of these coal-fields took place after the deposition 

 of the new red sandstone series, and that, therefore, the break so 

 prevalent in the South-west of England, between the upper part of 

 the coal measures and the new red sandstone, can no longer be con- 

 sidered as of general application in English geology. 



From the amount of dislocation which has taken place throughout 

 all this region, accompanied by an enormous destruction of masses 

 of new red sandstone, and from the protrusion of so many points of 

 trap rock, some of which cut through that formation, the author is 

 disposed to think that the recently described outlier of Lias at Cloverly, 

 and Prees * in Shropshire, may have been originally connected with the 

 chief escarpment of lias in Warwickshire and Worcestershire, there 

 being in the large accumulations of gravel in the intermediate country, 

 many lias shells, which may have been derived from the destruction 

 of once continuous strata of that formation. 



In conclusion, he recapitulates what in former memoirs read to the 

 Society he has endeavoured to show — 



1st,* That certain trap rocks have been evolved during the forma- 

 tion of the transition rocks : 



2ndly, That others have burst forth subsequently to the consolidation 

 of these older strata, throwing them into vertical and broken forms, 

 and producing metalliferous veins in them : 



3rdly, That this period of activity was anterior to the formation of 

 the coal measures, as is proved by the strata of the latter resting un- 

 conformably upon the highly inclined edges of the transition rocks. 



Carrying on the inquiry from this point, the present memoir demon- 

 strates, 4thly, that igneous agency evolving precisely similar products 

 has been renewed at a much later period upon one of these lines of 

 ancient eruption ; and, finally, that the great disruptions around the 

 flanks of the central coal-fields of England took place after the accu- 

 mulation of the new red sandstone. 



A paper was afterwards read, " On the Crag of part of Essex and 

 Suffolk 5" by Edward Charlesworth, Esq.; communicated by Edward 

 William Brayley, Esq., F.G.S. This paper has since been published, 

 in our number for August, p. 8 1 . 



ZOOLOGICAL SOCIETY. 



May 12. — A letter was read, addressed to the Secretary by 

 P. L. Strachan, Esq., and dated Sierra Leone, February 22, 1 835. 

 It referred to some Alligators sent from that country by the writer 

 several months since, all of which died on their passage. It also 

 stated that he had forwarded to the Society a Mud Turtle (Trionyx?), 

 which, he hoped, would prove acceptable. 



A letter was read, addressed to the Secretary by A. MacLeay, 

 Esq., Colonial Secretary, New South Wales, dated Sydney, October 



* [See Lond. and Edinb. Phil. Mag., vol. vi. p. 314, and for July, pre- 

 sent volume, p. 59.— Edit.] 



Third Series. Vol. 7. No. 4 1. Nov. 1835. 3 H 



