171 



members of some Jurassic groups wliicli do not always agree 

 with the notions of English students on the same. It is but 

 fair to remind the reader that Dr. William Smith* was the 

 first geologist who described the EngUsh oolitic rocks, and 

 prepared a classification of, and nomenclature for the same, 

 and that his work has remained intact to our day. The 

 labotu-3 of "the Father of English Geology" on these rocks 

 having formed the foundation on which all subsequent students 

 of Jurassic geology have built up their systems. By keeping 

 these facts steadily in view, and taking Dr. Smith's classifica- 

 tion and hmitation as the standard for comparison, we shall 

 find that the apparent difference of opinion between Enghsh 

 geologists and those of some foreign schools, consists more in 

 a want of agreement about the definition and limitation of 

 certain subordinate groups, rather than in any real difference 

 about the rocks themselves. 



OOLITHE InFEKIEURE = INFERIOR OoLITE. 



In the departments of the Cote-d'Or, Saone-et-Loire, and the 

 Rhone, the Inferior Oolite, or Etage Bajocien, is well developed, 

 and resembles in many respects the correlative divisions of this 

 stage in the Cotteswold Hills. A very able "Memoire sur le 

 Groupe Oolitique Inferieur des environs de Macon Saone-et- 

 Loire" was contributed by Mons. M. de Ferry to the "Memoires 

 de la Societe Linneene de Normandie."t From this we learn 

 that I'etage Bajocien in that region rests upon the sands of the 

 Upper Lias, and is overlaid by I'etage Bathonien, as shewn in 

 the following diagram representing a generahzed section of the 

 Inferior Oolite in the Jura Maconnais. I am the more anxious 

 to introduce this section to the knowledge of the members of 

 the Cotteswold Club, as it shews how well the structure of their 

 classic ground is repeated in the centre of France, and how 

 truly the laws of stratigraphical geology are exemplified by a 

 comparison of I'etage Bajocien, near Macon, with Cleeve HiU, 

 near Cheltenham, (Fig. VI,) and Brown's HiU, near Stroud. 



* strata identified by organized Fossils : 1815. 

 t Tomesdi: 1861. 



