E. W. Burrou-s—Crag Fommiiiifera. 507 



Cra^, it has been necessary to re-examine the collections Previously 

 mad'e by the late Messrs. S. V. Wood and W K. P^^^■ke^^/- * « 

 work done by them, with Dr. H. B. Brady and Professor |- ^"P-t 

 Jones; and in view of the desirability of haying the latest in- 

 formation in a tangible shape, I have been ledto put together 

 some notes on the Crag and the Distribution of its Foramnnfei-a 

 for this Monograph, Part 11. An Abstract of my inemoir is now 

 offered to the British Association, meeting at Ipswich m the centre 

 of the Crag district. i a „ 



The relative abundance of the Bryozoan, Molluscan, and other 

 remains, besides the Foraminifera, is necessarily an important 

 element in the classification of the Crag beds, and is taken into 

 careful consideration. i i.- i , 



The Pliocene beds of the British Isles have been exhaiistively 



dealt with by Prof. Prestwich (1841-1890), and lately by Clement 



Reid in his " Pliocene deposits of Britain " (Memoirs Geol. Survey 



1890); and the foreign equivalents are tabulated in (x. -l^- Harris s 



A V 4. -PR >Jowfr,n'« "Svst List of F. E. Edwardss Coll. 



Appendix to K. B. JNewton s Ojsc. uisi ui j- . x^ ^^ 



British Oligocene and Eocene Mollusca, British Museum, 1891. 

 PLIOCENE FOKMATION. 

 A. Newer Pliocene Beds (Upper Crag). 

 I. Beds above the Red Crag (Norwich Crag, etc.) -From South- 

 wold there were enumerated ten species of Foraminifera in the J? irst 

 Part of the Monograph ; 



From Thorpe, near Norwich, seven species ; 

 From Bramerton, two species ; 



From the Chillesford beds, eight species are known. 

 These are common forms of Textilaria, Bidimina, Lagena, Nodosnria, 

 Polymorphina, Truncatulina, and Pohjstomella ; mostly ot North- 

 Atlantic habitat. ■, 

 11. Red Crag (Essex and Suffolk).-The coarse quartzose sand 

 and ferruginous condition of the Ked Crag were not favourable to 

 the presence and preservation of Foraminifera; but a more extended 

 research in the finer and lighter-coloured sands might prove 

 profitable, although a prolonged search through some ot the grey 

 sand, so rich in Mollusca, from Walton-on-the-Naze, has not resulted 

 in any additions to the twenty species recorded in the Monograph, 

 Part I, 1866, Table in Appendix II. 



B. Older Pliocene (Lower Crag). 

 I St ErtJi Beds.-Ki St. Erth, near Marazion, Cornwall occurs 

 a v^ry ^inall outlier of sands and clays, the PHofne age of which 

 was definitely established by the late Mr. S. V. Wood, ]un. (188o) 

 and a full description of the exposure f/« g^^^" ^^ ^If.^'- ^' ^• 

 Kendall and E. G. Bell (1886), and by Mr C. Eeid (1890) 



Beneath the vegetable soil and "head" (argillaceous deposit w th 

 angular stones), are sand and clay, and then a Jossrhferons blue c ay 

 (U to 3 feet thick), underlaid by a pebble-bed and sands, all aie 

 va lable, but amount to 12-14 feet in thickness. The loraminitera 



