Notices and Extracts from the Minutes of the Geological Societi/. 167 



Some of the fractures of the limestone show that it has enveloped other corals 

 (one of which retains all its beautiful markings and prominences) as well as 

 some of the terebratulaSj which are not placed in hollows of the rock, as is the 

 case with the lithophagous shells, but are so completely invested, that it would 

 be impossible for the animal to exist within such an inclosure. 



Of the circumstances under which this deposit has been formed I am not 

 able to give any account ; but they were doubtless analogous to those under 

 which the rock was formed in which the human skeleton was found at Guada- 

 loupe. That rock was composed entirely of fragments of corals and shells, 

 held together by a calcareous cement; but, in the present instance, the 

 cementing deposit is itself in such abundance as to assume the character of 

 a compact rock. 



6, Notice accompanying Specimens from the Neighbourhood of the Garo 

 Village of Rob a giri : extracted from a Letter from D.Scott, Ksq. of Bengal, 

 M.G.s. to H. T. Colebrooke, Esq. v.p.g.s. [Read March 2, 1821.] 



The country between Harigong and Robagiri has been already generally 

 described in Mr. Colebrooke's paper on the North-east of Bengal, in the pre- 

 sent Volume. The village bearing the latter name is situated about twenty- 

 five miles east from the Brahm-putra in Purgunnah Caribari. 



" In some places, on the mountain north of Robagiri (which is mentioned, 

 p. 136, as being more than 4000 feet in height), ridges of gneiss appear, par- 

 ticularly at the top, in an almost vertical position. At Robagiri itself, above 

 the white clay mentioned by Mr. Colebrooke (p. 136), a stratum of limestone 

 abounding in nummulites appears in the bed of the river. The position is 

 slightly inclined from the horizontal ; its thickness about two feet. It is crossed 

 by vertical fissures, dividing it into oblong rectangular blocks ; and rests upon, 

 and is surmounted by, beds of clay, which also itself contains nummulites of 

 similar character to those in the limestone, but less numerous, and of smaller 

 size. In some places this hmestone appears to contain bones*. On the op- 

 posite side of the river perpendicular cliffs of slate-clay, horizontally disposed, 

 rise to a considerable height. Close to a chalybeate spring, issuing from the 

 foot of these cliffs, is found bituminous shale, having the appearance of wood; 

 and near to it is bituminous wood. The sandstone, clay, &c. of the lower hills 



* In one of the specimens there are two small vertebrae of some fish, exactly similar to those 

 found in a clay from the same place : — This clay contains also an ostrea and a ribbed pecten. 



