454 ME. S. S. BTJCKMAN ON THE [Nov. 1903, 



I had time to investigate in some detail the strata in this section 

 which are equivalent to the Cotteswold Sands and the Cephalopod- 

 Bed. The following is the result : — 



Section No. 2 at Tilly-sur-Seulles (Calvados). July, 1895. 



Hemercs. Toarcian. Thickness in 



• ( 1. Nodules. Ft. ins. Ft. ins. 



.3 I 2. Clay about 6 



g \ 3. Clay. Terebratula of the punctata- \ 



j I stock from base 3 6 



"^ [^Aalensis Ammonites cf.aalensis-group „ 2 | 



Moorei Numerous species of Dumortier ia in 



the lower 2 feet. Compressed Du- )- 



morticrice at a higher level than the 

 Dumortier ice. more inflated forms— confirmed 



by Dr. Brasil. Dumortieria cf. 



■prisca in lower 6 inches J 5 6 



Dispansi (!). 4. Fragment of Hammatoceras (!) on 

 top of stone, with no other fossils 



found 4 



Struckmauni. 5. Stone with Pseudogrammocerata of 

 the fallaciosum and Bingmanni- 



type, and cf. doerntense 5 



Striatuli. 6. Stone with Grammoceras striatulum 



common, and Haugia Eseri 5 



6 a. Clay and clay stone, chiefly the latter; 



Grammoceras striatulum common. 1 

 6 b. As above, and with a doubtful frag- 

 ment of the Pseudogrammoceras 



fallaciosum-grouj) 19 3 2 



Variabilis. 7. Clay with Haug iaaff. navis at bottom o g 



Bifrontis. 8. Blue earthy stone, with Hildoceras 



bifrons and Dactyliocerata 1 



Here I found just the same faunal sequence as I had noted 

 for Gloucestershire, which in the main had been already observed 

 by Dr. Louis Brasil, who took me to the section. But he had 

 not separated the strata with the fallaciosum-tyipe of ammonite 

 (Pseudogrammoceras) from the beds with the striatulum-type 

 (Grammoceras). However, I found that here, as in Gloucestershire, 

 there was the same sequence — Pseudogrammoceras certainly above 

 the chief horizon of striatulum. 



The persistence of clay in this section right up into what we are 

 accustomed to speak of as ' Inferior Oolite ' is interesting ; ifc shows 

 the little value of distinctions founded on lithic features. And the 

 4 Midford Sands ' one may look for in vain, though the fauna is well 

 shown. 1 



1 The ammonites of the genus Dumortieria are particularly noticeable. The 

 bulk of them are of the type of Dumortieria subundulata (Branco), as delineated 

 in my ' Monograph of the Inf. Ool. Ammon.' pt. vi, pi. xlv. (Pal. Soc. vol. xlv, 

 1892.) 



