50 GEOLOGY. 



' Craie glauconieme,' in consequence of the lenticular arrangement of the 

 beds and their variable lithological constitution. He proceeds to esta- 

 blish the zone of Ammonites injlatus, which he considers to be distinct 

 from the true Gault or Albian, by its fauna, its lithological character, 

 and its wider geographical distribution. In its typical development it 

 consists of a mass of clayey marls, in which beds of greensand are 

 lenticularly disposed and sometimes attain great thickness ; its charac- 

 teristic fossils are Amm. injlatus, Inoceramus sulcatus, and Ostrea vesi- 

 culosa. In tracing the beds round the basin the Gault of Puisaye and 

 Perthois is found to comprise two members, (1) Sands with Ammonites 

 mammillaris ; (2) Clays 90-120 feet thick, which are sometimes partly 

 replaced by lenticular sandy beds, such as the Gres des Drillous and the 

 Sables de Puisaye ; above these come clayey marls, with Amm. injlatus, 

 30 to 300 feet thick. In Argonne these marls are replaced by sandy 

 beds called ' Qaize^ while the Gault clays gradually thin out, allowing 

 the Qaize to overlap on to the Lower Sands. In Artois he considers 

 the Amm. injlatus zone to be represented by a few feet of sandy clay ; 

 but even these eventually thin out, allowing the Pecten asj^er zone to 

 come down on to the Amm. mammillaris sands. Thus the Gault thins 

 out against the axis of Artois ; but the complete series is found again in 

 the Boulonnais, and constitutes what has been called Gault at "Wissant. 

 He then briefly describes the distribution of the Gault in England, 

 and concludes with discussing the value of an etage^ and the mode in 

 which the beds described should be grouped ; he proposes to unite the 

 Aptian and Albian into one etage, the zone of Amm. injlatus forming 

 the base of the * Craie glauconieuse ' or Cenomanian. A. J. J-B. 



Barrels, Charles. Couches traverse'es a Lievin par la fosse Numdro 3. 

 [Beds sunk through at Lievin.] Atm. Soc. Geol. Nord, t. ii. p. 63. 



The section shows : — 1, Micr aster chalk ; 2, chalk rock ; 3, Terehratu^ 

 Una gracilis chalk-marl ; 4, Inoceramus lahiatus do. ; 5, Ammonites 

 Rhotomagensis glauconitic chalk ; 6, chloritic marl ; 7, Pecten asper 

 marls; 8, Terehratella Menardi bed (Sarrasin=Tourtia of Montignies). 

 The Coal Measures are reached at about 152 metres. G. A. L. 



La Zone a Belemnites plenus. Etude sur le Cenomanien et 



le Turonien du Bassin de Paris. [Zone of Bel. plenus, between 

 the Cenomanian and Turonian of the Paris Basin.] Ann. JSoc. 

 Geol. Nord, t. ii. pp. 146-193. 

 When the L. and U. Chalk are traced round the Paris Basin, the 

 lithological characters of the different subdivisions are found to vary, 

 the beds being mainly calcareous on the N. and S., while argillaceous 

 conditions prevail in the E. Beginning with the calcareous region, 

 the author treats the following divisions in detail, and gives lists of 

 fossils from all : — 1. Zone of Ammonites injlatus. 2. Zone of Pecten. 

 asjper.^ 3. Zone of Holaster subglohosus : this he divides into four hori- 

 zons, viz. a, of PloeoscypJiia mceandrina; h, of Amra. varians; c, of 

 Am7n. Rhotomagensis ; d, of Bel. plenus. He speaks briefly of the zones 

 above, viz. 4. Zone of Inoceramus lahiatus ; 5. Zone of Terehratidina 



