160 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 15, 



stratification imperceptibly passes into the high inclination of the 

 slaty cleavage. It is the neighbourhood of some plutonic rock, of 

 which we have evidences in the numerous veins of pegmatite run- 

 ning through the gneiss, that has effected the metamorphosis. 



Having said thus much about the mutual relations of these rocks, 

 I have now to make some general observations on their contents, 

 both mineral and organic. 



I. Minerals. — These have been ably described by the Rev. Pro- 

 fessor Haughton in a paper read before the Royal Dublin Society in 

 November of the past year, and published in the ' Philosophical Maga- 

 zine ' for January last. I shall notice only those that are more im- 

 portant, and that obviously belong to the rocks at present under our 

 consideration. 



In the trap at the Takli Artillery Lines, which encloses pieces of 

 the clayey fossiliferous deposit (see figs. 3 <fc 4), there are also con- 

 tained masses of" calc-spar curiously striated, the lines of growth not 

 being perpendicular to the optic axis, but formed by planes parallel 

 to one of the edges of the obtuse trihedral angle of the rhombohe- 

 dron, and intercepting equal portions on the other two edges of that 

 angle." The doleritic lava, which is quarried from Sitabaldi Hill, 

 and which answers to the lower trap of fig. 3, is in some places 

 marked with belts, that may be traced continuously for many yards, 

 consisting of cavities " lined with obsidian in a thin glazed pellicle, 

 and occasionally filled up with tabular crystals of calc-spar." In 

 the trap on the south escarpment of the hill represented in fig. 3, 

 there was discovered a rhomboidal piece of a green mineral, which 

 Professor Haughton proposes calling Hislopite, being in his opinion 

 worthy of distinction as a new species from the remarkable combina- 

 tion in it of calcareous matter, which gives the outward form to the 

 whole crystal, with a grass-green siliceous skeleton of glauconite, 

 which on analysis he finds to be a hydrated tersilicate of protoxide 

 of iron, or in more technical form : 



^ 3 }3Si0 3 + 3HO. 



Our trappean minerals, however, are few and worthless, compared 

 with the varied and magnificent assortments at present procurable in 

 the Western Ghats between Bombay and Puna. In a letter received 

 a few days ago from my friend Mr. Carter I am told, that the tunnel 

 now being carried through the Bore Ghat lays open geodes fre- 

 quently as large as grottos, the sides of which are covered with every 

 variety of zeolitic and siliceous mineral to be found in trap. 



At Gfidsid, and at Panjra near the Pench River a little above its 

 junction with the Kolbaira, there are found, in the red clayey tertiary 

 deposit of the fields, " radiated concretionary nodules of brown car- 

 bonate of lime and iron." These being supposed to be peculiar to 

 the first-mentioned locality were craftily taken advantage of by some 

 faMrs residing there to found on them a story about the wonder- 

 working powers of their master. It rather spoils the credit of this 

 fable to fall in with the same supposed petrified fruits in another 



