576 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



systeme Condrusien of Dumont) ; and the South Devonian Limestone, 

 with peculiar modifications, is made to succeed the Old Red Sand- 

 stone, or Rhenane series, and the Old Red Sandstone to overlie the 

 Ilfracombe or calcareous group of North and South Devon. 



1853. Godwin- Austen. — " On the series of Upper Palaeozoic groups 

 in the Boulonnais." This remarkable district is ably deciphered by- 

 Mr. Austen. The author divides the series into two divisions — (1) 

 the limestones above and below the Cove, and (2) the Yellow Sand- 

 stone group ; he subdivides the two into seven series, showing 

 succession of beds and conditions indicated. A note accompanies this 

 paper from Mr. D. Sharpe (p. 246), containing a list of the organic 

 remains ; this note is of much value, though 1 cannot agree with 

 the author's conclusion relative to the position of the Petherwyn 

 beds, or fossils. 



1854. Siluria, MurcJiison, Sir B. — Noticed under the third edi- 

 tion, in 1859. 



1855. Jukes and Salter. — '^ Notes on the Classification of the De- 

 vonian and Carboniferous Rocks of the South of Ireland " *. 



1855. Murchison and Morns. — " On the Palaeozoic and their 

 associated Rocks of the Thiiringerwald and the Harz." In the 

 first part of this memoir reference is repeatedly made to the De- 

 vonian series of Thiiringerwald. The Upper Devonian, " Younger 

 Greywacke" of Credner and Richter, consists of the Upper Devonian 

 and Lower Carboniferous, united by these authors into one subgroup, 

 which appears to constitute one physical mass covering over, or 

 abutting against, the Lower Silurian rocks. 



In part ii. the Devonian Rocks of the Harz, as well as on the 

 Rhine, are shown to be composed chiefly of the Spirifer- or 

 Coblentzian sandstone and slates, which contain the same charac- 

 teristic fossils as the rocks of the same age in Devonshire. The 

 deductions bearing upon the distribution and condition of the Devo- 

 nian series throughout the communication should be consulted, as 

 they are additional to, and confirmatory of, the views propounded 

 by Sedgwick and Murchison in 1842. 



1856. Oodvjin- Austen. — " On the possible Extension of the Coal- 

 Measures beneath the South-eastern part of England." Speculative 

 as this paper is, and necessarily must be, the generalizations and 

 philosophical and suggestive views put forward by the author are 

 of the highest and most important order ; they relate to the Devo- 

 nian as well as to the Carboniferous Rocks and their distribution. 

 The lacustrine condition of the Old Red Sandstone and the area 

 occupied by that formation are discussed, and the physical con- 

 ditions of the old land-surface, &c., are carefully noticed. Those 

 details in the paper bearing upon the condition of England and 

 Europe during the deposition of the Old Red Sandstone, Carboni- 

 feroas Limestone, and the growth of coal, are important, and com- 

 mand the attention of all the physicists. 



1859. Murchison, Sir B. — 'Siluria'f. The third edition (in- 



* Dublin Geol. Joorn. vol. vii. June, 1855. 



t History of the oldest Fossiliferous Eocks, and their IToundations, &c. 1859. 



