Geological JVblices of Baibary. 'Zlil 



covered by sandstone, (gres) alternating with sand, the sandstones 

 containing the same shells with the calcaire moellon of Pro- 

 vence. He had found belemnites in the supposed lias. He con- 

 cludes by stating that the groupe of talcose schists is the inferior 

 floor of the provinces of Algiers and Titery ; that the tertiaries 

 have been deposited posterior to the elevation of the schists, and 

 that certain trachytic porphyrys, near the ancient Rustonium, 

 about six leagues from Algiers, did not make their appearance 

 until after the deposit of the tertiaries." 



Our geological readers will be struck with the importance of 

 the remarkable agreement of the entire formations, of the oppo- 

 site coasts of the Mediterranean, as well as with the equivalent 

 tertiaries south of the httle Atlas; all of which facts occasion 

 many curious reflections concerning the ancient geological state 

 of that part of the world. 



In concluding this abstract, we would point to the especial 

 interest which these notices of M.Rozet will in future create, when 

 it is known that the principal geological circumstances which he 

 has so clearly made out on the coast, and in the interior of the 

 province of Algiers, are, with the exception of the Atlas chain, 

 repeated on our Atlantic coast; where we have the primary 

 rocks stretching from New York to Florida, with occasional de- 

 posits of blue marl, covered with sandstone and ferruginous sand, 

 as at Mullica Hall, Tinton Falls near Long Branch in New Jer- 

 sey, and many other places, the secondary character of these is 

 well made out by belemnites, crocodiles, saurians, &c. — and they 

 are again superimposed by acknowledged tertiaries,in New Jersey, 

 Delaware, and especially in Maryland and further south, to the 

 total exclusionof the great calcareous deposits connectedwith coal, 

 and the numerous beds of the oolitic series and chalk formation. 

 We hope, ere long, to be in a situation to enter systematically 

 upon the geology of this country; but we perceive more and 

 more forcibly the necessity of raising up a school, and of rallying 

 practical geologists here, before we can look for such contribu- 

 tions and aid, as the important task before us demands. 



