1842.] Bijapore to Bellary via Kannighirri. 957 



Merritch and Gurdinny, a village about 40 miles S. E. from the city of 

 Bijapore to Bider ; thence north of Hydrabad to Nagpore ; and from 

 Nagpore north-easterly towards Sohagepore and Sagur to the 82d degree 

 of East longitude, as observed by Franklin and Coulthard. At Gur- 

 dinny it rests on granite, a broad pegmatitic zone intervening. A little 

 to the east of Gurdinny, at Mudibhal, on a crystalline sandstone; and 

 at Nagpore on granite. Its north-eastern limit has not been accurately 

 denned ; straggling coulees of a similar trap, (containing olivine, calce- 

 donies and agates,) have however been traced by the Rev. Mr. Everest 

 as high as Gwalior, which lies in lat. 26° 15' N. and Ion. 78° 1' E. 

 It is said to extend still farther toward the east up to the Rajmahal 

 hills : though it would appear that its continuity here becomes broken 

 up. Assuming Gwalior as its north-east corner, we will return towards 

 the Western Coast by the northern limit, passing from Gwalior in a 

 south-westerly direction to Neemuch ; whence taking a direction more 

 southerly to Dohud, as traced by Captain Dangerfield, it passes by the 

 east of Baroda to the sea near Bulsar, a little to the south of Surat. On 

 this last line the trap was found, at Sagur, to rest on shell limestone, and 

 on the limestone, greenstone, quartz, argillaceous, and talcose rocks of 

 Oodipore. At Bulsar, as before stated, it is bounded by strata of clay 

 and kanker.* 



Such is the unparalleled extent of this vast sheet of trap, covering a 

 space, with some interruption, of 250,000 square miles. 



Since writing the above, I have had the pleasure of perusing Col. 

 Sykes's admirable paper on this great trappean region, and perceive 

 that he assigns to it an area of from 200,000 to 250,000 square miles 

 only ; but adds, however, that it appears to him that the above are 

 not the absolute limits of the trap. My own observations, taken 

 during journies to Bijapore, Bider and Culberga, will have served to 

 trace its S. W. boundaries more distinctly than has hitherto been done. 



* It is probable tbat the amygdaloidal trap found overlying a bed of limestone, con- 

 taining oysters, limnae, small melaniae, &c. at Peddapungali near Rajahmundry, and 

 discovered by Col. Cullen, is an outlier of the great overlying trap formation. 



