168 



THE GEOLOGIST. 



PROCEEDINGS OP SOCIETIES. 



GEOLOGICAL SOCIETY OF LONDON. 

 (Continued from page 1 50.) 



March 9th, 1842. 3. On the Bock Basins in the Bed of 

 Toomhuddra, Southern India, {lat. 15^ to 16^ N.) By Lieut. 

 Newbold. 



The rock basins occur principally below the ancient stone 

 embankments thrown across the Toombuddra, for the pur- 

 pose of irrigation, near the island of Desauur. They are 

 generally of a circular or oval form, the diameter of the in- 

 terior being usually greater than that of the mouth, with a 

 projection at the bottom in many cases. They abound where 

 cascades occur, and are never found in places where the cur- 

 rent is not strong. Lieut. Newbold also alludes to similar 

 cavities in rocks above the surface drainage of the country, 

 which he ascribes to the agency of temporary torrents pro- 

 duced by rain. 



4. — Notices of a great Cavern, of the Remains of Elephants, 

 and of a Well sunk in Pumice, ^c, in Mexico, By Mr. J. 

 Phillips. 



The cavern known by the name of the Cave of Cuernavaca, 

 occurs in a limestone hill, near the village of Cacaguamilpas, 

 32 leagues south-south-west of Mexico ; it is composed of 

 two branches, of great height. Other caverns occur in 

 Mexico. The only fossil found by Mr. Phillips in the lime- 

 stone, which is abundant in Mexico, is a species of Astrea. 

 The remains of the elephant were found near the Hacienda 

 of Chapingo, in making a canal to communicate with the lake 

 of Mexico. At twelve feet below the surface, an ancient 

 causeway was discovered, and two or three feet lower the 

 remains of the elephant. Mr. Phillips alludes to Humboldt's 



