12 



THE CEAG 



appears to have been partially consolidated anterior to 

 the deposition of the Eed Crag, as in some cases it has 

 evidently been denuded, and frequently perforated by the 

 Pholades. Mr. Lyell (1841) gives the following table as 

 illustrative of the numerical proportion of recent and fossU 

 species in the English tertiary formations. 



Periods. 



Post Pleiocene. 



J yresh-w 

 1_ Valley of 



Localities, Sec. 



-water of the 



Newer Pleiocene. 



Older Pleiocene 



Miocene 



Eocene 



' the Thames 

 Marine strata near 



Glasgow, 

 ^lammaliferous or 



Norwich Crag. 



lied and Coralline 



Crag, Suffolk. 



London and 

 Hampshire. 



Number 



Per centage of/ossiU 



of recent. compared. 



99 to 100 . . 40 

 85 to 90 . . 160 

 60 to 70 . . Ill 

 20 to 30 . . 450 

 1 or 2 ... 400 



LOCALITIES EOR FOSSILS, &c. 



Mammaliferous Crag. — Easton-Bavant, Southwold, Henham, Bra- 

 merton, Thoqie, Postwick, Whitlingham near Norwich; Brid- 

 lington, Yorkshire. 



Red Crag. — Felixstow, Sutton, Tattingstone, Ipswich, Woodbridge, 

 Suffolk ; Walton, Essex. 



Coralline Crag. — Ramsholt, Orford, Sutton. 



LIST OF PUBLICATIONS, &c. 



Bean, W., ' On a deposit at Burlington Quay,' 3Iag. Nat. Hist. 



vol. viii. p. 355. 

 Charlesworth, E., ' Mag. Nat. Hist: 1836, p. 537 ; Md. 1838, p.40. 



Phil.3Iag. August, 1835. Report British Association, 1837. 



