ZONE OF ARIETITES BUCKLANDI. 



45 



In Luxembourg the Lower Lias is well developed, and the Bucklandi-beds represented 

 by the upper portion of the Gres de Luxembourg. This formation has received different 

 names by different authors ; it is the " Calcaire sableux " of Boblaye, the " gres de 

 Luxembourg" of Omalius, the " Steininger " of Dumont, the "Calcaire sableux" of 

 Sauvage and Buvignier, the "Lias a" of Quenstedt, the "unterer lias Sandstein " of 

 Roerner, the " Quadersandstein " (pars) of some German authors, and the " Gresliasique " 

 of Terquem, with the Gres d'Hettange. In France, in Department of the Moselle, the 

 Bisulcatus or Bucklandi-beds have been diligently studied by MM. Terquem and Piette, 

 and the fruit of their labours is given in detail in their able work quoted already, in 

 which the following species of Cephalopoda are catalogued from the Bisulcatus-beds : 

 — Arietites bisulcatus, A. Kridion, A. Conybeari, A. obtusus, A. Birchii, A. lacunatus, 

 A. Boucaultianus, A. Laigneletii, A. centaurus, A. caprotinus, A. Hagenovi, A. raricos- 

 tatus, A. lavigatus, A. sinemuriensis, Nautilus striatus, N. Schlumbergeri, Belemnites acutus. 

 Besides these there are 60 species of Gastkropoda, 106 species of Lamellibranchiata, 

 11 species of Brachiopoda, 8 species of Annelida, 6 species of Polyzoa, 12 species of 

 Echinodermata, 3 species of Crustacea, 15 species of Anthozoa, 20 species of Forami- 

 nifera, and 3 species of Plants. Of this total 177 are found in lower zones, 57 are 

 special to the Bisulcatus-beds, and 140 pass into the upper stages of life. 



In the Cote d'Or M. Collenot, in his ' Description Geologique de l'Auxois,' has given a 

 section of the Lower Lias, which shows the sequence of the beds near Semur. 

 The upper series represent the zone of A. Birchii. 

 The middle do. do. A. Bucklandi. 



The lower do. do. A. Scipionianus. 



The last rests upon the Angulatum-beds or the "Foie de Veau," and the following 

 Palseontological list has been made with great care from the beds. I had the privilege, 

 through the courtesy of MM. Collenot and Breon, of examining all the species obtained 

 therefrom, and contained in the Semur Museum. 1 



List of the Fossils of the Bucklandi-beds in the Cote d' Or, France. 



Cephalopoda. 



Arietites Scipionianus, cTOrb. 



— Hehli, Reynes. 



— viticola, Dumort. 



— Rouvillei, Reynes. 



— Schlombachi, Reynes. 



— Charmassei, d'Orb. 



— Delmasi, Reynes. 



— Scylla, Reynes. 



— circumdatus, Mart. 



— Collenoti, Reynes. 



— rotiformis, Sow. 



— rotator, Reynes. 



Arietites coronarius, Quenst. 



— obesus, Reynes. 



— bisulcatus, Brug. 



— Vercingetorix, Reynes. 



— Bucklandi, Sow. 



— Sinemuriensis, d'Orb. 



— striarius, Quenst. 



— mandubius, Reynes. 



— Deffneri, Opp. 



— d'all'Erse, Reynes. 



— Terquemi, Reynes. 



— Petri, Reynes. 



1 'Description Geologique de l'Auxois,' p. 226 ; ibid., p. 235, 1873. 



