UPPER PORTION OF DUNDRY HILL. 



209 



Falciferi 

 lower 3 inches. 



ft. ins. ft. ins. 

 BiFRONTis. 13. Compact argillaceous limestone, blue 



and ironshot for the uj^per 5 inches, 



and pink, not ironshot, for the lower 



3 inches. The blue part contains : 



Hildoceras bifrons, Dictijlioceras and 



Harpoceras falciferum and Rhynclwn- 



ella, coated with iron oxide, together 



with derived limonitic lumps. The 



pink portion Las a matrix similar to 



that of the derived fossils in the beds 



above, and it contains Harpoceras 



falciferum and Harp, exaratum. 



Thickness 8 inches 5 



3 



14. Pink clay. Harpoceras afif. Strang- 



waysi, 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. Dactylioceras, and belemnites 9 



1 11 



17. Greenish clay proved by trenching 



about 34 feet (vertical) without a sign 

 of Marlstone or of any hard rock. 



The fossiliferous strata associated with the " hifrons-heds^^ 

 are interesting for the regular sequence of different am- 

 monites. There are at this eastern end of Dundrj Hill thin 

 fossiliferous deposits laid down during the dispansi, striatuli, 

 variabilis, and hifrontis hemerae, of a similar thickness to the 

 same deposits found at the western end. During the earlier 

 portion of the variabilis hemera local denudation was evi- 

 dently in progress, as is shown by the condition of the 

 deposits numbered 11 and 12 ; the bifrons-hediS, have evidently 

 been broken up and redeposited just before or during the 

 time of variabilis. 



Immediately above these thin stone beds (Nos. 4-16 of the 

 above Section) occurs a considerable argillaceous deposit, 



