Mineralogy and Geology. 267 
When we consider that the age of the nummulitic formation of the 
Pyrenees, however clearly it may now be determined to be tertiary, 
rior to the calcaire grossier of Paris, especially when we learn that even 
now M. Agassiz affirms, that out of 139 species of echinoderms de- 
scribed by him from the nummulitic beds of the Mediterranean, one » 
species only is common to them and the caleaire grossier. ‘The same 
geologist maintains that all the fish of Glarus and Monte Bolea, which 
according to the latest opinions must be classed as eocene, differ en- 
tirely from those of Sheppy.* Yet I am by no means disposed to ques- 
tion, on the ground of this want of agreement in the ichthyolites, that 
the Glarus slates are in truth: aren still less - Gone that the lime- 
stone of Monte Bolca belongs to same period: I have always re- 
garded the latter as eocene from rs time when 1 ‘visited that locality 
“in company with Sir Roderick Murchison in yen You have seen 
also, in the classification of the three successive eocene Ginnatinne es- 
tablished by. Mr. restwich for the older tert a “deposits of Great 
Ha A 
The peossuchege abave. alluded to, of Sir Sedetick Murchison 4 in the 
in 1847,.and the paleontological evidence of various eminent _ 
— brought together by him in illustration of his views, have, I 
ink, shown i ae that, together with the oe og : 
stg an enorm 
Ing group of Petirnd Feo sandstone and impure limestone, appears to 
me to be far less successful, since a true representative of the Maes- 
tricht. beds is wanting in the Th or is very Pill iedefined, and no other 
equivalent assembla, age 7 remains is enumerated sufficiently 
in character, to fill up the wide gap beri 
tween the eocene strata cea : : 
chalk. « 
I have dwelt eb at ph on the age of the pummalitie series, bes ~ 
cause its recognit 
remark made o tee M. Desnoye yy years’ ago ddress to the 
wr 
the utmost ieoretieel i importance, “and is singalarly fade of Red 
