MESSRS. S. S. BTTCKMAN AND E. WILSON [Nov. 1 896, 



Section VII b (continued). 



ft. 



Bifrontis (cont.). and pink, not ironshot, for the lower 

 3 inches. The blue part contains: 

 Hildoceras bifrons, Bactylioceras 1 and 

 Harpoceras falciferum coated with iron 

 oxide, together with derived iron lumps; 

 also Bhynchonella. The pink portion 

 has a matrix similar to that of the 

 derived fossils in the overlying beds, 

 and it contains Harpocer as falciferum 



Falciferi & H. exaratum. Thickness 8 inches . 5 



lower 3 inches. 3 



14. Pink clay. Harpoceras aif. Strangwaysi, 



Pseudolioceras? sp 6 



15. Pale drab, earthy stone 5 



16. Pinkish-drab, ironshot, earthy stone 



with lumps of greenish stone bored 

 by Lithodomi, and covered with iron 

 oxide, Bactylioceras and belemnites ... 9 



1 11 



17. Greenish clay, about 34 feet proved, 



without a sign of Marlstone or of any 

 hard rock. 



The fossiliferous strata associated with the ' bifrons-he&a ' are 

 interesting for the regular sequence of different ammonites. There 

 are, at the eastern end of the hill, thin fossiliferous deposits laid 

 down during the dispansi, striatuli, variabilis, 2 and bifrontis hemerse, 

 comparable in amount to those found at the western end. During 

 the earlier portion of the variabilis hemera local denudation was 

 evidently in progress, as is shown by the condition of the deposits 

 numbered 15 and 16 ; the bifrons-heds have evidently been broken 

 up and redeposited just before or during the time of variabilis. 



Immediately above the thin stone beds occurs a considerable 

 argillaceous deposit, with a species of Hammatoceras at the base, 

 and species of Dumortieria in its main mass. This is what we 

 have called the ' Durnortieria-he&a,' and it is the same deposit as 

 that which we found at the western end of the hill. It is a notice- 

 able series, and we shall have something further to mention con- 

 cerning it (see p. 707). 



1 Two species: — 1. Cf. commune, Sowerby, pi. cyii., but less coarsely 

 costate. 2. Cf. annulatum, Sowerby, pi. ccxxii. fig. 5 (the coarser-ribbed of his 

 two forms, but thinner). 



2 It may be noted that although the deposits are said to have been laid down 

 during three hemerse, Bumortierits, dispansi, and striatuli, the exact ammonite 

 sequence found by S. S. Buckman to obtain over a large extent of country is as 

 follows : — 



6. Bumortierim. 



5. Hammatoceras insigne, with other species of the genus. 



4. Grammoceras dispansum. 



3. Grammoceras Struckmanni, and allied species. 



2. Haugia Eseri (with occasional species of No. 1). 



1. Grammoceras toarcense and Gr. striatulum, common. 



As an actual matter of fact, no specimens of Grammoceras dispansum have 

 been found at Dundry Hill. 



