ETHEEIDGE — DEVONIAN ROCKS AND FOSSILS. 573 



he corrects certain errors, and gives much valuable research bearing 

 upon the succession of the whole series in West Somerset and Devon. 

 In the history of the Devonian controversy it is important, but 

 needs no special comment here. The author, however, states his 

 opinion that ten consecutive series occur in and occupy the whole 

 country from Caunington Park and the Quantock Hills in West 

 Somerset to the Land's End in Cornwall. (Proceed. Geol. Soc. vol. iii. 

 1839, pp. 158-162.) 



1839. De La Beche. — ' Report on the Geology of Cornwall, 

 Devon, and West Somerset'*. In this important memoir the author 

 discusses the above three areas in all their aspects, still retaining 

 the term "■ Greywacke " for the whole of those rocks below the carbo- 

 naceous deposits. In the 5th chapter (pp. 127-155) these two 

 groups receive important notice, and the views and opinions of 

 continental authors, both physical and palseontological, are given as 

 bearing upon the relation of the two systems. Accompanying, or as 

 part of, this work, appeared in the year 1841 Prof. PhiUips's ' Pa- 

 laeozoic fossils of Devon, Cornwall, and West Somerset,' being a de- 

 scription of all the then known organic remains of the Devonian 

 rocks, to be noticed hereafter. 



1840. Sedgwich and Mitrchison. — " On the Physical Structure of 

 Devonshire, &c."t. In this elaborate paper, which at the time 

 exhausted the subject, the five regions into which the authors divided 

 Devonshire are graphically and clearly described, their views upon 

 the geological structure of which was received then, and cannot now 

 be controverted. The chapters descriptive of the succession of the 

 deposits in North Devon between the north coast and the culmi- 

 ferous series, and of those between Dartmoor and the south coast 

 in South Devon, should be read and consulted by all who would seek 

 to understand the physical structure of Devon. The second part of 

 their paper, " On the Classification of the older stratified Rocks of 

 Devonshire and Cornwall, &c."J, contains much information upon 

 the organic remains, and their distribution through the divisions 

 therein proposed. 



1840. Lonsdale. — "On the Age of the Limestones of South 

 Devon " §. This paper was intended to show again that the author 

 was the first to infer from zoological evidence that the Limestones 

 of South Devon would prove to be of the age of the Old Red Sand- 

 stone. It is a complete resume and summary of the opinions pre- 

 viously entertained respecting the age of the limestones which are 

 associated with the slates, &c., of Devon and Cornwall. The older 

 authors had placed these Limestones in the Primary- transition or 

 Greywacke and Carboniferous series, though Mr. Prideaux had pre- 

 viously assigned them in part (or in mineral characters) to the Old 



* Published by order of the Lords Commissioners of Her Maiesty's Treasury, 

 18.39. s y y> 



t Trans. Geol. Soc. 2nd series, vol. v. p. 633. 

 + Ibid. p. 688. 



§ Proc. Geol. Soc. 1840, vol. iii. p. 281. Trans. Geol. Soc. 2nd series, vol. v. 

 p. 721, &c. 



