300 Capt. Grant on the Geology of Cutch. 



term the natural walls in the Runn, described in treating upon that district, 

 there can be no doubt, as I have found them at angles, varying from a few 

 degrees above the horizontal position to the vertical, and even turned over 

 beyond that point. 



That these beds have been disturbed and broken through by igneous 

 agents is quite evident from the dykes of basalt, which occasionally intersect 

 them. 



5. NuMMULiTic Limestone and Marl. 



Although the imbedded fossils of the Nummulitic group resemble those of 

 some tertiary beds of England and Prance, still the strata of which it consists, 

 differ so totally in mineralogical character and general appearance from 

 any of the other formations in Cutch, that it deserves a separate notice. It 

 is bounded partly by the second or sandstone and coal formation, partly by 

 beds which I have coloured as tertiary, and partly by the alluvial banks of the 

 eastern branch of the Indus, extending from Luckput to a plain between the 

 villages of Wage-ke-Pudda and Eyeraio, about thirty miles to the southward. 

 It consists of a mass of small Nummulites mixed with Fasciolites ; and some 

 of the river banks present a perpendicular section of solid rock, from 60 to 

 70 feet in height, entirely composed of these small fossils agglutinated toge- 

 ther, and varied only by a species of Orbitolites, frequently bent into a saddle 

 shape. This stone has much the appearance of chalk, and the beds are ho- 

 rizontal, except where they have been disturbed. In some parts, however, 

 it is much harder, particularly near the town of Luckput, where it is quarried 

 as a building stone, and is also burnt for lime. The surface-soil is entirely 

 composed of the small fossils lying loose, and generally known by the name 

 of Luckput sixpences. 



The beds of nummulitic limestone on which Luckput stands have been af- 

 fected in a manner deserving of notice. 



Tank. Tank. Mound. South Wall. Town. North Wall. Runn. 



The high ground to the east of the town sends off three parallel ridges to 

 the westward, ranging nearly east and west. On the two northernmost of 

 these ridges, the north and south walls of the fort of Luckput are built; whilst 

 the southernmost lies at a distance of about 200 yards from the south wall. 

 A kind of valley runs through the town, ending, at its western side, in a 



