OF THE SWISS JURA AND ENGLAND. 243 



character as in the localities named above. The beds contain 

 numerous crinoid stems and some sponges. 



On the roadside opposite Brenets the whole of the ' Spongitien ' 

 is seen as in the following section : — 



ft. 



Pholadomien 30 



c ... / Well-bedded thick limestone, 15 ft | 9Q 



fcpongitien . . . j Limestone ^fa shaly part icles, 14 ft j Jy 



Callovieu 5 



Dalle nacree 10 seen. 



The ' Pholadomien ' is somewhat variable in this district. In the 

 1 Combe Grede ' these beds are very thick and are made up of : — 



3. A series of thin-bedded limestones, sometimes nodular, with 

 partings of shale. 



2. Thick series of bluish shales, poor in fossils. 



1. Thin limestones and shales similar to (3). 



In the section opposite Brenets, mentioned above, the Phola- 

 domian is 30 feet thick, and consists of thin limestones with 

 partings of clay of about equal thickness. 



The upper beds of this substage have been worked for cement at 

 Les Praises, "West of Ste. Croix, and here they consist of nodular, 

 grey, argillaceous limestones. The lower part is more marly. 

 Similar beds were also seen at Les Auges. 



The following fossils were obtained from the Oxfordian in the 

 southern district : — 



Localities. 



Ammonites convolutus, Querist. ... La Vraconne, St. Sulpice, Les 



Auges, and Combe Grede. 



hecticus, Rein Combe Grede. 



Belemnites hastatus, Blainv Combe Denayriez. 



Pleuromya varians, Ag Ditto. 



Voltzii, Ag Ditto. 



Pholadomya scutata, Ag North of Ste. Croix. 



cingulata, Ag Combe Denayriez. 



exaltata, Ag Ditto. 



Anatina undulata, Thill Ditto. 



Modiola bipartita, Sow Ditto. 



Goniomya proboscidea, Ag Ditto. 



Astarte robusta, Et Les Auges. 



Nucula ornata, Quenst Ditto. 



Terebratula orbis, Quenst Combe Denayriez. 



bisuffarcinata, Schl Ditto. 



Collyrites, sp Ditto. 



The Corallian is much less developed in the southern district than 

 in the northern, and, indeed, appears to be represented by a series 

 of beds which correspond only to the Terrain a Chailles siliceucc of 

 the northern district. 



The stage is described (Jaccard, op. cit. p. 201) as consisting of: — 



3. A dark blue clay, which underlies the Astartian. 



2. Reddish-brown limestone, poor in fossils, passing down into a 



series of thin-bedded limestones, which are very fossiliferous. 

 1. Barren clays. 



