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XLIII. — On the Physical Structure of Devonshire, and on the Subdivi- 

 sions and Geological Relations of its older stratified Deposits, ^c. 



By Rev. ADAM SEDGWICK, M.A., P.G.S., P.R.S., &c. 



Woodwardian Professor of Geology in the University of Cambridge ; 



And RODERICK IMPEY MURCHISON, Esq., P.R.S., V.P.G.S. 



[Read June 14th, 1837.] 



Plates L. to LVIII. 



CONTENTS. 



Part I. 

 Introduction, p. 633. 

 Chap. I. — Description of the five geographical 



regions of Devonshire, p.634. 

 Chap. II. — 'Successive deposits between the 



north coast of Devonshire and the culmi- 



ferous series, p. 638. 

 Chap. III. — Succession of deposits between 



Dartmoor and the south coast of Devon, 



p. 649. 



1. Section from the east side of Dartmoor 



to Torbay, p. 650. 



2. Section from Dartmoor to the Plymouth 



limestone, p. 653. 



3. Section from the Plymouth limestone to 



Bolt Head, p. 656. 



4. Section from Berry Head to Start Point, 

 p. 659. 

 Conclusions, p. 662. 

 Slate-rocks of Cornwall, p. 664. 

 Chap. IV. — Culmiferous series. Its relations 

 to the other formations, — structure, — 

 fossils, &c., p. 669. 

 Lower culm-measures, p. 670. 

 Upper culm-measures, p. 677. 

 Plants, p. 681. 

 Chap.V. — On the graniteof Dartmoor, p. 685. 



Part II. 

 On the classification of the older stratified 

 rocks of Devonshire and Cornwall, (Read 

 April 24, 1839.) p. 688. 



PART I. 

 Introduction. 



In a communication made to the British Association during its meeting at 

 Bristol (1836), we first pointed out (by help of a section extending from the 

 north coast of Devon to Dartmoor) the true geological position of the great 

 culmiferous deposits, which occupy so large a portion of that county. In this 

 paper our object is more extensive ; for we not only attempt to describe the 



