238 GEOGNOSY OF INDIA. 



noticed, at Robagiri in the same district, a stratum of white 

 limestone containing nummulites and vertebrae of fish, 

 surmounted by beds of clay which contain the same nura- 

 muUtes, and also bones of fish, with specimens of the 

 genera Ostrea and Peclcn. Near Silhet, the Laour Hills, 

 composed of white limestone abounding in immmulites, 

 form another example of a tertiary formation in the eastern 

 extremity of this province. Mr. Pent land discovered among 

 mutilated fragments of bones, referable to the mammalia 

 from these tertiary deposites, remains of four distinct 

 species, viz. 1. A new species of the genus Anthracolherhun 

 of Cuvier; 2. A small species of ruminant allied to tho 

 musk-deer tribe ; 3. A small species of herbiverous animal 

 referable to the order Pachydermata, but more diminutive 

 than any of the fossil or li\'ing species ; and, 4. A carnivo- 

 rous animal of the genus weasel or viverra. In addition to 

 the above the following are mentioned by Mr. Colebrooke : — 

 Sharks' teeth, vertebra and fin-bone of a shark, crocodiles' 

 teeth, vertebra of a crocodile's neck, thigh-bone of a croco- 

 dile, dorsal fin and pectoral fin of a balistes, palates of the 

 lay, palates of the diodon, oj'ster-shells of various species, 

 a Turritella, and several species of Ealani and Patella. 

 These strata thus present us with the same association of 

 organized remains that accompanies the tertiary strata of 

 Europe, in which extinct genera of the Pacliydermata have 

 been discovered, and also with marine shells of the same 

 genera, if not the same species, with those which charac- 

 terize the most modern antediluvian formations, those de- 

 scribed under the title of upper marine formation m the Paris 

 basin, and to which are to be referred the extensive marine 

 deposites encircling the shores of the Mediterranean, those 

 covering the less elevated countries of Central Europe, and 

 that appear to extend as far as Lake Ural into the interior 

 of Asia. The tertiar}' deposites of Caribari, as already 

 noticed, appear to form a band at the base of the Thibetian 

 mountains, since we find them extending to Silhet. How 

 far this formation may stretch along the peninsula of Ma- 

 lacca and Hindostan it is impossible at present to say ; al- 

 though it seems to occur at Madras, where it contains the 

 same shells as on the Brahmapoutra, and at Pondicherry^ 

 where it encloses great masses of woodstone. 



7. Alluvial Rocks. — The usual alluvial deposites occur 



