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Classification of the Fossiliferous Rocks. 173 
Silurian and the lower would have been christened Cambrian. It 
was not so known or understood, however, and it has now, I believe, 
become practically impossible to remedy the mistake, if it be one, 
and to persuade men to call those things Cambrian which they have 
always been in the habit of calling Silurian, although no one will 
be more ready than myself to adopt the change of nomenclature, should 
it be generally decided on. The only way to bring such a correction 
into use would be to adopt a middle term, and to speak of the lower 
Silurian as Cambro- Silurian. 
The following valuable Table of the divisions of the Fossiliferous 
Rocks will be found exceedingly useful for our geological readers. 
Upper Stratified or Fossiliferous Rocks. 
I. Modern Rocks. 
Comprising all mineral accumulations of the present time, namely, 
Alluvial of the rivers, Coral islands and reefs, Thermal springs, Glacier 
moraines, Icebergs, Tide deposits, &c. 
II. Quaternary. 
Comprising the Diluvial rocks, the Drift and Erratic blocks, Cavern 
deposits and Osseous Breccias, Loess of the Rhine, &c. 
III. Tertiary. 
Pliocene. Crags of Suffolk, England. 
Antwerp Crag ; Sands of Diest, Belgium. 
Cotentin Crag; Faluns de la Loire; Sables de la 
A. Urrrr Ter- Sologne et des Landes, France. 
TIARY Group. | Oeningen deposit, Switzerland. 
Be a beds, or Mattajoue ; Creta di Sienna, 
taly. = 
Aralo Caspian, or Steppe Limestone, Russia. 
Miocene. Wanting in England. 
Bolderberg sands, Belgium. 
Calcare 4 Helix de la Beauce ; Fontainebleau Sand- 
' stone ;* Molasse de Leognan et Caleair de Bourg 
B. Mippur TEer- near Bordeaux ; Sansan deposit ; lower beds of la 
_ TIARY GRovP. Limagne d’ Auvergne ; Gypse d’Aix, France. 
Nagelfluh and Molasse, of Switzerland. 
Molasse of Superga and Bormida’s valley ; Coal of 
Caddibuona, Piedmont. 
Salt deposits of Wieliczka, Poland. 
Eocene. Barton Clay ; Bagshot Sand ; London Clay. 
Limburg beds; Brussels beds. 
Gypse de Montmartre; Grés de Beauchamp ; Cal- 
caire Grossier ; Argile plastique de Paris; Molasse 
du Fronsadais et Calcaire de Blaye prés de Bor- 
‘C. Lower TeEr- deaux. 
Pate Gaon: Nummulitic formation. Dax, Biaritz and the Cor- 
biéres deposits. 
Flysch of the Alps. Nummulitic Sandstone of Kres- 
senberg, Austria. 
Ronea and Monte Bolea deposits, Vicentine. Ma- 
cigno and Alberese of the Apennines. 
Kief and Antipofka rocks, Russia. 
* The Fentainbleau sandstone of Lyell belongs to the Eocene. 
