part 1] jurassic chronology : lias. 



Table XI. — Fauna l Analysis of Raasayan 7. 



97 





ni 











CO 









% 







CO 



c 



ft 



&D 



a 





-p 

 o 

 o 



6 



-P 



c3 

 O 



o 



CO 



PQ 



<1 



<D 



3 



CD 



-P 



«! 





Xfl 



-p 



to 



to 

 o 



CO 



O 



-p 



ID 

 CO 



O 



CD 



o 





-p 



CO 



< 



Raasayan 7 [b]. 



















leclieubyi fauna 



X 



X 



X 



X 



X 





X 





Raasayan 7 [a]. 























... 



X 



X 



X 



X 





X 



It would seem advisable for the present to record the faunas 

 separately, marking what the Dorset Coast shows to be the upper 

 one (Bed 105) as Raasayan 7 b, and the lower one (Bed 103) 

 as 7 a. 



Table V. Bed 94. Dr. Lang tells me that I have misread 

 his information — that Dproceras bisjoig'inerum is 25 feet below 

 the top of Bed 99 instead of 15 feet. This brings it into the 

 top of Bed 93. The relative position remains the same ; but this 

 places it in close connexion with mbplanicosia forms, and 

 suggests that the avmatoid horizon of Bed 96 ought to be kept 

 separate : it would have to be referred to as ' the second armatoid 

 horizon,' for the present. The numbering and tabular record, 

 p. 276. would be as in the following table : — 



Table XII. — Faunal Analysis of Raasayan 3. 





West 

 Scotland. 



X 



... 



Yorkshire. 

 X 



Dorset 



Coast. 



X 

 X 







P. 267, line 1. For rapidly read readily. 



P. 276. Table IX, Whitbian 2, acutum. Dr. A. E. Trueman 

 states that Tiltoniceras acutum and T. costatum occur in the 

 upper portion of a 3-foot bed in the Lincoln district with some 

 Dactyloids, but that the latter alone characterize the lower horizon. 1 

 This corresponds well with already-observed discrepancies in 

 the geographical distribution of Tiltoniceras and these early 

 Dactyloids. 



In the Northampton district a -post-acnfum bed of sandy cla} r 

 with no fossils is reckoned as top part of the Transition-Bed. 2 

 This underlies the Fish- and Insect-Beds, a deposit which, on 

 the evidence yielded by the ammonites, is to be separated from 

 the tewuicostatvm or exaratum horizons. 



1 XXI, 2, pp. 103, 106. 

 Q. J. G. S. No. 301. 



a XX, 1, p. 34. 



