212 Alfred Bell — The Sticcessioiz of the Crags. 



This statement is supported by the " absence of any definite order 

 of succession in the various beds of the lower" division of the Eed 

 Crag, and the absence of any " distinction in the organic remains 

 from the base of the Eed Crag to the top of the lower division" 

 (embracing the Norwich Crag), except that north of the Iken ridge 

 the fauna assumes a more littoral character, becoming much poorer 

 after passing Butley. 



These points I now propose to examine. Omitting as of little 

 value any refei'ence to the indefinite stratification of the beds, I must 

 remark that I have already stated in the pages of this Magazine ^ my 

 reasons for dividing the Red Crags into two horizons (each possess- 

 ing a deep and shallow water fauna), with a difference between them 

 of 190 species of shells alone. The lists were the tabulated results 

 in separate columns of collections made in the pits of Walton, 

 Waldringfield, Foxhall, and Sutton, for the older ; and at pit Gr of 

 Mr. Prestwich's plan, at Ea^^msholt, Bawdsey, Butley Farm, Butley 

 Mill, and in the Chillesford Stackyard for the Newer Eed Crags. 



As an admirable plan is given by Mr. Prestwich, I shall confine 

 myself at present to the question, how far it bears out Mr. Prest- 

 wich's deductions? 



Pits D and G open at opposite sides of the Coralline Crag Hill (vide 

 plan), the Eed Crag being represented as completely surrounding it, 

 but in excavating along a trench on the east side of the zigzag field 

 north of the cottage, we found that the Coralline Crag came to the 

 surface under the top soil, the Eed Crag lying by the side as if it 

 had formed in a hollow of the older deposit, both afterwards having 

 been planed off to one level. This Coralline Crag extends across 

 the field and separates the Eed Crag of the two pits ; thus showing 

 that the Eed Crag does not surround the Coralline Crag Hill as in the 

 plan. In preference to making the Coralline Crag Hill a little islet 

 in the Eed Crag Sea, I would suggest that at this date it was a con- 

 tinuous reef trending westward, on opposite sides of which the older 

 and newer Eed Crags were formed. 



The shells obtained from the trench were Ostrea cochlear, Pecten 

 princeps, P, maximus, Cyprina Islandica, Panopea Faujasii, Trochus 

 ziziphynus, Buccinopsis Dalei, Fissurella costaria, Balanus concavus, 

 and others as at Eamsholt. 



Unfortunately I cannot offer so large a list of the fossils of pit D 

 as I should like, but as in the mass the fossils are those of the adja- 

 cent pits near the Sutton Farm and Shottisham, I have grouped 

 them together. The following species of the pit D and the 

 immediate neighbourhood do not occur in pit Gr or any beds of the 

 same horizon that 1 have collated with it ; Pecten Westendorpianus, 

 Mytilus phaseoUnus, Limopsis aurita, Leda minuta, Chama gryphoides, 

 Cardium decor ticatum, ? Kellia suborbicularis, Erycina Geoffroyi, Astarte 

 triangidaris, A. crebriliratra, Isocardia cor, Cardita orbicularis, 

 Venus imbricata, Lucinopsis Lajonhairii, Lutraria elliptica, Donax 

 politus, Tellina Benedenii, Panopea Faujasii, Pandora rostrata, 

 Pholas cyJindrica, Fusiis alveolatus, F. consociale, F. elrgans, Buccinum 

 1 The English Crags. By A. and R. Bell. Geol. Mag. 1871, Vol. VIII., p. 256. 



