INTRODUCTORY, 15 



from tlie oldest to the youngest, and that the salt of Livonia (Russia) 

 occupied the same position as that of the Punjab. 



Among the fossils Dr. Fleming had sent home, Messrs. de Verneuil 

 and Davidson had recognised — 



Productus cora, 



P. costatus, 



P. Flemingi, 



Orthis crenistria? 



Terelratula Roi/sii, 



T. crispata ? 

 and new species of Terebratula. 



Sir Roderick observed that the second letter of Dr. Fleming^s was 



chiefly remarkable for the author^s belief, drawn 

 Sir R. I. Murchison. 



from physical phenomena, that the chief saliferous 



masses had been produced by eruptive agencies. This opinion was purely 



the result of observation, as Dr. Fleming was unaware some distinguished 



geologists have held the same views. 



In the valuable work of Vicomte D^Archiac and M. Jules Haime,* 

 D'Archiac and Haime, ^^^ geology of the Salt Range is referred to. They 

 '^^^^' give in their geological resume (page 173, &c.) a 



sectional representation of the range, which may be considered diagramatic, 

 for it includes together groups seen only at its opposite ends, and 

 represents a strong unconformity between the tertiary sandstones and 

 the underlying limestone which has not been found to exist. Taking 

 their information perhaps from the observations of Dr. Fleming, 

 the authors described the lowest rocks as Devonian, including conglo- 

 merate (1), gypseous and salt-bearing rocks (2), and red sandstone 

 (3). Above these are slaty and calcareous clay and sandstones (4 

 and 5) , supposed to represent the carboniferous formation, then limestone 



* Description des Animaux Fossiles, du groupe Nummulitique de I'lnde, par le Vicomte 

 D'Archiac et Jules Haime. Paris, 1853. 



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