THE 



LONDON and EDINBURGH 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



[THIRD SERIES.] 



AUGUST 1835. 



X. Observations on the Crag-formation and its Organic Re- 

 mains; with a View to establish a Division of the Tertiary 

 Strata overlying the London Clay in Suffolk, By Edward 

 Charlesworth, Esq.* 



A KNOWLEDGE of the comparative distribution of or- 

 -**- ganic remains throughout the various strata of the globe, 

 a close attention to the different circumstances under which 

 such remains have been deposited, and an intimate acquaint- 

 ance with the resemblance borne by them to existing genera 

 and species, are points now generally regarded as being of the 

 highest importance in connexion with geological deductions. 

 I shall not, therefore, deem any apology necessary for offering 

 the following observations in reference to a subject which, 

 though affording ample scope for more extended investigation, 

 has till within a late period been very generally neglected. 



It is not a little singular that while the tertiary formations 

 of Great Britain and the Continent have recently excited so 

 large a share of attention, a portion of our own island, occu- 

 pied by so interesting a deposit as the Crag, should have re- 

 mained comparatively unexplored. 



With the exception of one or two notices in the Geological 

 Transactions, we had little correct information on the subject 

 till the appearance of Mr. R. C. Taylor's work on the Geo- 

 logy of Norfolk, in 1827, subsequently to which Mr. Samuel 

 Woodward published his Outlines of the Geology of the 



* Communicated by the Author. This paper was read before the Geo- 

 logical Society, May 27, 1835. 



Third Series. Vol. 7. No. 38. Aug. 1835. M 



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