328 SCIENCE PROGRESS. 



In France the two zones which M. Chalmas x re- 

 cognised in the upper assise of the Lias of Normandy 

 (Granmioeeras aalense and Lioceras opalinum), but which 

 he did not find in direct superposition, have been so found 

 by Brasil (6) at several places around Caen. Here, as in 

 Germany, the aalense zone is the lower. 



Immediately to the north-west of the Jura Mountains 

 the Abbe Bourgeat (5) has examined the Oxfordian and 

 Corallian of the region between Dole, Salins, and Besancon. 

 The ferruginous banks with Ammonites macrocepkalus and 

 A. aueeps, which occur in the Jura proper and which corre- 

 spond with our Kellaways rock, are absent ; and the Ox- 

 fordian rests immediately upon a limestone with Rhynchonella 

 varians, evidently the equivalent of the upper part of our 

 Great Oolite series. The Oxfordian itself consists of marls 

 and limestones, with numerous sponges ; and several of the 

 beds as they are traced towards the Jura lose the littoral 

 character which they possess in the west of the area. The 

 succeeding Corallian consists of limestones with bryozoa; and 

 was a shallow-water deposit. From this author's account 

 one would be justified in concluding that during these two 

 periods the land lay not far to the west, towards the Cote 

 d'Or. 



In the vast expanse of the North German plain it is 

 seldom that the beds below the drift are exposed ; and 

 any addition to our knowledge of the rocky substratum 

 is very welcome. Some forty years ago in the Island of 

 Wollin at the mouth of the Oder, Wessel 2 found numerous 

 loose blocks with fossils which he referred to the Oxfordian, 

 and the same fossils occurred also in a clay which he dis- 

 covered in situ. Deecke (10), in re-describing the area, 

 points out that the fossils belong to what we now know as 

 the Callovian, or to the Cornbrash (upper Dogger of the 

 Germans). At another point a bed occurs in situ with 

 Beleninitcs giganteus, which belongs to the middle Dogger. 

 In this paper Deecke attempts a classification of the rocks 



1 But/. Soc. Geo/., France, vol. xx. (1892-93), p. clxiii. 



2 Zeitschr. Deutscli. Geo/. Ges., vi. (1854), p. 305. 



