Revieics — Lemoine's Geologie du Bassin d-e Paris. 135 



Diademopsis Heberti, etc. We are glad to note tlie preservation 

 of the name Avicida contorta. 

 LIAS. Eour stages are distinguished — 



ToAECiAN. This is taken to include the Ammonite zones from 

 that of Harpoceras fcdciferum to that of H. {Lioceras) opalimim, 

 thus including not only equivalents of our Upper Lias but 

 overlying Passage Beds (Midford Sands). It is noted that 

 Professor E. Haug would include higher zones belonging to 

 the basal portion of the English Inferior Oolite.^ 

 Chaemotjthian. This is taken to include the Ammonite zones 

 from that of ^goceras Valdani to that of Amaltlietcs spinatus, 

 and is therefore equivalent to the higher part of our Lower 

 Lias and the whole of our Middle Lias. The term Charmouthian 

 is thus inappropriate, as the main portion of the English 

 Middle Lias is not present in the Charmouth cliffs, and more- 

 over the term has been used by Mr. S. S. Buckman for the 

 zones from EcMoceras raricostatum to Liparoceras capricornus, 

 A term taken from a French locality would be preferable for 

 the Paris Basin. 

 SiNEMUEiAN. This incliifles the Lower Lias Ammonite zones 

 from that of Arietites rotiformis to those of A. stellaris and 

 A. ohtusus. 

 Hettangian, This includes the basal Lower Lias zones of 

 Psiloceras platiorbis and Arietites BiirgundicB, and overlying 

 zones of A. liassicus and ScMotheimia angulata. 

 A diagram-section from Longwy, west of Luxembourg, to Hirson, 

 west of Mezieres, shows the Bajocian overlapping the Toarcian in 

 a westerly di^-ection and resting directly on the Charmouthian. In 

 the Cotentin the Charmouthian overlaps lower beds of the Lower 

 Lias and rests directlj^ on the Trias. Important beds of iron-ore 

 occur in the higher part of the Toarcian in Lorraine in the zone of 

 Harpoceras (^Grammoceras) aalense. 



LOWER JURASSIC (of author).^ 



Bajocian. This series is rightly taken to include the strata from 

 the zones of Harpoceras Murchisotxe and H. concavmn (grouped 

 together as Aalenian) to the zones of Cceloceras suhcoro7iatum 

 and C. Blagdeni, with overlying zones of Cosmoceras Garanti- 

 aniim and Parhinsonia Parhinsoni (grouped all together under 

 the zone of Oppelia suhradiatd). 

 Bathonian'. The zonal subdivisions (in descending order) are — 

 Bradfordian, with Oppelia aspidoides, (Ekotraustes serrigerus, 



and Oxynoticeras discus. 

 Vesulian, with Oppelia fusca, Iforphoceras polymorphum, and 

 PerispMnctes zig-zag. 

 In I^ormandy the highest beds are equivalent to the Cornbrash, 

 and the lowest (including the Caen stone) to the Fuller's Earth of 



1 See remarks of Professor J. Welsch, Geology of Thouars, noticed in 

 Geol. Mag., September, 1911, p. 419. 



- The author regards, the Lias as forming a separate system, and he uses the 

 term Lower Jurassic in the sense in which Lower OoHtic is used in England. 



