4 
THE GEOLOGIST. 
Coq., and the Natica Sautieri, Coq. The typical localities are, the 
Auberson Valley, near St. Croix, St. Cergues, and Les Ronsses. 
(c). The Metabief Limonite {Limonite de MeLahief), forty feet thick, 
is generally a reddish limestone, containing oolitic iron-ore ; the 
strata are thin, and easily decomposed by atmospheric action. In 
some places, as in the valley of Nozeroy, blue marls exist at the base 
of this division. The fossils are very numerous, and beautifully pre- 
served ; those characteristic are — Chelonia Valenyiniensis, Pic. ; Croco- 
dile ; Plesiosaurus Neocomiensis, Camp. ; Pycnodus cylindricus, Pic. ; 
Asteracanthus granulosus, Eger.; Ammonites Gevrilianus, D'Orb. ; A. 
Alarcousanus, D'Orb. ; Nerinea Marcousana, D'Orb. ; Pholadomya 
Sclieuzeri, Agass. ; Pygurus rostmhis, Agass. ; Hemicidaris patella, 
Agass.j Acrocidaris depressa, Gras.; Catopygus Renaudi, Agass.; &a 
Typical localities : Metabief, Boucheraus, and St. Croix. 
The Middle Neocomian, or the Chateau group, as it is called in 
reference to the castle of the town of Neuchatel, the foundation of 
which rests entirely on this group, is composed of three divisions ; 
(a) the Hauterive clay, (6) the Ecluse rocks, and (c) the yellow, or 
Neuchatel stone. 
(a). The Hauterive clay {Marnes d^ Hauterive), thirty feet thick, 
consists of blue and sometimes plastic clay, with more or less of a 
yellow tint and very numerous fossils ; the most common are, Toxaster 
complanatus, Agass. ; Diadema rotulare, Agass. ; Terebratula '^yroelmiga, 
Sow.; Ter. Marcousana, D'Orb.; Rhynchonella depressa, D'Orb.; Ostrea 
Couloni, Defr.; Corbis cordiformis, D'Orb. ; Trigonia caudata, Agass.; 
Venus Dupiniana, D' Orb. ; Panopea Neocomiensis, Agass. ; Cardium Voltzii, 
Leym.; Pleurotomaria Neocomiensis, Agass., &c. It is easy to distin- 
guish three zones in these clays, characterised by different associations 
of fossils ; the lower zone, or Censeau beds, the middle, and the upper 
zone. Typical localities : Hauterive, near Neuchatel, St. Croix, Cen- 
seau, Nozeroy, &c. 
{h). The Ecluse rocks (Roches de r Ecluse), forty feet thick, are com- 
posed of yellowish, often green, spotted limestone, alternating near the 
base with yellow marls. Characteristic fossils : Rhynchonella depressa, 
Sow. ; Ostrea Rotisingaultii, D'Orb.; Lima Royeriana, D'Orb. ; Pecten 
Cottaldinus, D'Orb., &c. Typical localities : the Ecluse behind Neu- 
chatel Castle, and Censeau. 
