323 



Reports and Proceedings — 



II. — Memoire sur le Terrain Cretace des Ardennes et des 

 regions voisines. Par le Dr. Charles Barrois. 



[Extrait des Annales de la Soc. Geol. du Nord, tome v. pp. 227-487, Lille, 1878.] 



THERE exists no more indefatigable a labourer in the cause of 

 geological science than Dr. Barrois, for not only has he carried 

 his observations into many formations and over an extended area, 

 but his works are always characterized by a scrupulous care to do 

 credit to every previous observer in the branch of inquiry which he 

 takes up. The present work contains a description of the Cretaceous 

 rocks forming part of the Paris Basin, in a department situated 

 to the north-east of France. It embraces accounts of the Aptian, 

 Albian, Cenomanian, Turonian, and Senonian strata, known more 

 familiarly to us as Lower Greensand, Gault, Upper Greensand, 

 Lower and Upper Chalk, respectively. 



Full descriptions, and lists of fossils from the several formations 

 are given, and comparisons are made with beds developed in other 

 districts. 



The following is a summary of the divisions described : — 



f Bed with ( Chalk of Epernay with Belemnitella mucronata. 

 \ Chalk of Reims with Belemnitella quadrata. 



Senonian. 



Turonian. 



Cenoma- 

 nian. 



Albian. 



Aptian. 



Belemnitella. 

 ^ Bed with 

 | Micraster 

 L coranguinum. 



Bed with 



Micraster 

 breviporus. 



Magnesian Chalk with Marsupites. 

 Magnesiai! Chalk with Inoeeramus involutus. 



Upper. 



Lower. 



Chalk of Vervins with Epiaster brevis. 

 Chalk rock with Holaster planus. 



Marl with Terebratulina gracilis. 



Bed with Inoeeramus labiatus. 



White Marl of Argonne and glauconitic marl of 



Thierache with Belemnites phnus. 

 Marl with Ammonites laticlavius. 



!K*„? f Sr }«-.**-*« 



( Zone of Ammonites inflatus. 

 Zone of Epiaster Ricordeanus. Phosphates of Talmats. 

 Bed with Ammonites interruptus. 

 Bed with Ammonites mammillaris. 



Clay and Sands with Ammonites milletianus, Ostrea arduennensis. 

 Ironstone of Bois-des-Loges. 



H. B. W. 



EEPOETS J±1<TJD PEOCBEDI1TGS. 



Geological Society of London. — I. — May 14, 1879. — Prof. P. M. 

 Duncan, MB., F.R.S., Vice-President, in the Chair. — The following 

 communications were read : — 



1. " Further Observations on the Pre-Cambrian Eocks of Caer- 

 narvon." By Prof. T. M'Kenny Hughes, M.A., F.G.S. 



The author divides these into (1) the volcanic series, (2) the felsitic 

 series, (3) the granitoid series. He traces the former of these, con- 

 sisting of coarser and finer varieties, from Caernarvon to near Port 

 Dinorwig. Beyond these come the felsite series, which is overlapped 

 by grits and conglomerates as far as the Bangor road, N.E. of Brithdir. 



