1838.] Geology of the K&sya Mountains. 73 



compact blue rock alternating in single strata with a coarse earthy oolite 

 of a calcareous nature*. These appear to rest (as well as could be de- 

 termined during a cursory examination while passing) on a slate clay 

 composed of argillaceous blue clay with slaty layers of ferruginous matter 

 and sandstone. The compact beds abound in nummulites, and in frag- 

 ments of the same rock which had been quarried somewhere in this 

 vicinity and conveyed to Chatt'k for the purpose of making lime, a 

 turbinolopsis ocracea was foundf . Now although we cannot as yet 

 contend for the universal and contemporaneous distribution either of the 

 same organic species or geological formations, yet as the chalk of Europe 

 is represented in several extensive tracts of that continent by rocks 

 which are very unlike, and especially in the Morea, by a compact num- 

 mulite limestone, and in the South of France by an oolite containing 

 nummulites, there is no reason why, in the present state of our knowledge 

 we should not refer our compact nummulite limestone, together with the 

 oolite associated with it, to the cretaceous group. See Lyell, 4th ed. 

 vol. IV. 287-8, where the observations of MM. Boblaye and Virlet, 

 are referred to in support of the equivalent distribution of chalk and 

 nummulite limestone in Europe. 



In the Chirra Punji coal no vegetable impressions have been found ; 

 but slight opportunities have been hitherto afforded of examining the 

 adjoining shales in which they are chiefly to be expected. I found in 

 the bed of coal at Serarim, however, which appears to be the same 

 formation, a large phytolithus, or stem, characteristic also of several of 

 the independent coal formations of Europe and America ; a similar fossil 

 appears to have been also found by Voysey, in the coal of Central 



* Although 40 geographical miles distant from Silhet, it is named in Mr. 

 Colebrooke's paper, Silhet limestone ; but as other limestones may be found 

 nearer Silhet, the necessity of being more definite in our allusious to localities 

 in India is obvious. In the following volume of the same Transactions, this 

 rock (supposing it to be the Silhet limestone), is said to be white, and also 

 to contain in the G arrow mountains vertebrae of a fish ; but unless we presume 

 that the Rev. Dr. Buckland, the eminent author of the paper in question, 

 identified these in Mr. Scott's specimens, and that they were overlooked by 

 Messrs. Clift and Webster who examined them for Colebrooke's paper, we 

 must attribute the statement to a similar vague indication of localities as that 

 above referred to ; as we look in vain for an instance of Mr. Scott having found 

 vertebrae of fishes in the nummulite limestone, although such were found by 

 him in the sands and clays of the Caribari hills, as appears from the list of fossils 

 in Colebrooke's paper. 



f A madreporite represented by a single star, the radii of which, as well as 

 the form of the fossil, correspond with T. ocracea, represented in the Suppl. vol. 

 Griff. Anim. King. 

 L 



