384 



CRETACEOUS. 



Upper 

 Gault A 



(about 72 feet). 



Junction bed. | 



series of specimens.' IMany of the gems of private collections 

 have been obtained by John Griffiths of Folkestone. (See Fig. 60, 



p. 358.)' 



The Gault of Folkestone has been divided into the following 

 zones : ^ — 



Feet ins. 

 Toxi& oi Ammonites 7-ostrattis {A. iuflatus). Clay with 



seam of greensand 56 3 



,, Kingena lima. Pale grey marl 5 i 



,, Ammonites varicosus {luoccranms sulcatushtdi). 



Pale grey marly clay 9 5 



,, ,, criitatus (Nodule bed). Clay with 



nodules o 9 



,, ,, rt'?/;7/?/j- (Dark bed). Dark clay 6 2 



,, ,, denai-iiis (Mottled bed). Dark 



mottled clay I o 



,, ,, hiiitns{Coxa.\bt6.w\\.\\SmilotrochHs). 



Mottled clay I 6 



,, ,, De la Riiei. Clay o 4 



,, Crustacea [Palccocorystes) (Crab bed). Fawn- 

 coloured clay 4 6 



,, Ammonitt's aiiritus, var. Dark clay, iridescent 



fossils 4 3 



Dark clay with phos-> 

 phatic nodules I 

 ijtterriipti/s J Dark greensand f '^ " 

 I Nodules of iron- 1 

 ^ '^ pyrites -' 



viammillaris. Coarse grit and 

 phosphatic nodules. (See p. 372.) 



Lower 



Gault 

 (about 2S feet). 



Lower 

 Greensand. 



The Upper Gault is sometimes termed the Zone of A. wjlatus, 

 and the Lower Gault the Zone of ^. lantiis. 



The fossils of the Gault include Pinites and other Plant-remains; 

 a few Sponges ; Foraminifera ; Corals ; Echinodermata, Hemiaster, 

 Pt'iitacnnns ; Annelides, Serpula articiilata ; Crustacea, PolUcipes, 

 Necrocarcinus, etc. The common Mollusca of the Gault are 

 Nautilus Clevientinus, Hamites ijiteiincdius. Ammonites splendens, 

 Ancyioceras spinigerum, Bclcmnites minimus, Aporrhais {Rostellaria) 

 carinata, Dentalium dtcussatum {ellipticuni), Solarium ornatum, 

 Inoceramus sulcatus, I. concmtricus, PUcatida pectinoides, Nucula ovata, 

 N. pcctinata, etc. The Fishes include Otodus, and Saiirocephalus ; 



1 All fossils from clay strata, but especially those from the Gault, the Oxford 

 Clay, and the Lias, require almost daily care and attention for the first few weeks 

 after they are removed from the bed in which they occur, or the entire surface will 

 flake off in drying. A judicious application of very dilute gum, mixed with one- 

 fourth part glycerine or sugar, is found to give the necessary tenacity to these 

 delicate remains ; but the practised fossil-collector prefers treating such objects with 

 thin gelatine as a more durable hardening material. — Dr. H. Woodward, G. Mag. 

 1866, p. II. 



- See also Fitton, T. G. S. (2), iv. Plate 8 ; and F. Drew, Geol. Folkestone, 

 etc. (Geol. Survey). 



3 F. G. H. Price, The Gault, 1S79 ; Q.J. xxx. 342; C. E. De Ranee, G. 

 Mag. 186S, p. 163 ; S.J. Mackie, Geologist, iii. ; W. Topley, Geol. Weald, p. 145 ; 

 W. Whitaker, G. Mag. 1864, p. 213. 



