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CORNISH POST-TERTIARY GEOLOGY. 



PEEFATOKY STATEMENT. 



In the course of a series of articles on the recent geology of Corn- 

 wall, begun in January last, in the "Geological Magazine," I referred 

 in the March number, p. 102, to papers on the same subject which 

 I had submitted to the Geological Society. These papers contain the 

 Inilk of original observations made by me during leaves of absence 

 in 1876, and also embody such quotations as are necessary to 

 establish the classification put forward, being the records of pheno- 

 mena which could in no way come under my personal observation. 

 The articles in the "Geological Magazine" were intended to supple- 

 ment this general work of description and classification, by bringing 

 out the historical part of the subject, the mass of bibliography, and 

 detailed accounts of each section of the paper : so that the com- 

 bined papers might bring into one view all that had previously 

 been written on the subject, and show that the reasoning was 

 logically founded on fact, and that facts not coming within the 

 author's direct observation had not been distorted to accord with his 

 views. The whole subject was originally embodied in a single 

 paper too voluminous to obtain admission in any Society's Journal. 

 It lay dormant for two years, during which I neglected no oppor- 

 tunity of adding to the details which a survey of the superficial 

 deposits of Devon and Somerset, extending over the six previous 

 years, had enabled me to accumulate. The general results of my 

 survey of the recent deposits of Devon and Cornwall are to be 



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