part 3] 



THE DEA'ONIAK OP JERQUES. 



231 



Upper G-ivetian ; but there is no petrological dividing-line. The 

 Bastien Limestone described by Rigaux is the upper part o£ this 

 limestone ; but there are no shales between the two limestones, as 

 he states. He has evidently been misled in the same way as 

 Oodwin-Austen, through not allowing for the shifting of the 

 outcrops by the faulting. 



The beds are well exposed almost right across the outcrop in 

 Banc-Noir Quarry, and on the opposite side of the railway ; there 

 are also exposures in the Bastien Quarry on the west and in a small 

 quarry between Blacourt and La Capelle near La Poussinerie. 

 The upper beds are fossiliferous, where corals are common. The 

 following fossils are recorded by Rigaux from this limestone (but 

 further work is necessary in order to zone the beds) : — 



Athyris betencourti. 

 A. pelapaijeiisis. 

 Atrypa aspera. 

 Spirifer urii. 

 Sp. orbelianus. 

 Sp. bouchardi. 

 Sp. curvatus (?). 



Rhynchonella boloniensis. 

 Leptmna cedulse. 

 Cyrtina heteroclyta. 

 Stringoc&phalus burtini. 

 Cyathophyllum boloniense. 

 C. bouchardi. 

 Favosites dubia. 



Frasnian. 



Shales of Beaulieu and Dolomites of Les Noces. — Part 

 of these beds may, after zoning, prove to be more properly referable 

 "to the Grivetian. They consist of three series of shales, two of 

 dolomite and dolomitic limestone, surmounted by a group of thinly- 

 bedded dolomite, as follows : — - 



Feet. 



fRed and green marl with stone parting'... 5 



! Green marl 2 



■m -i • t\ -i ■ . Yellow sandy dolomite 22 



Beaulieu Dolomite -s -r,, , •■ j , ■, c 



Black sandy dolomite 5 



! Yellow sandy dolomite 29 



(^Purple and green compact dolomite 13 



Upper Beaulieu Shales. Chocolate and g'reen shales 115 



Upper Les Noces Dolomite. Red and yellow dolomite 112 



Middle Beaulieu Shales. Chocolate shales 60 



Lower Les Noces Dolomite. Red and yellow dolomite 105 



Lower Beaulieu Shales. Chocolate shales 120 



The Beaulieu Shales are very constant in composition and of 

 a uniform chocolate hue, except immediately under the sandstones 

 and between the dolomites, where the shales are bright olive-green ; 

 they are seldom fossiliferous. The dolomites resemble each other 

 closely, and are usually rough, sandy, and full of cavities. In 

 places, they do not form continuous outcrops, but seem to have 

 been built up as banks in the surrounding shales ; all the exposures, 

 however, fall into either the upper or the lower band. The series 

 of shales have in a similar way been confused, owing to a tendency 

 to ignore the faulting. 



The Beaulieu dolomite has previously almost escaped notice as a 

 separate bed, the black type and the green and purple type not 



