140 ACCOUNT OF THE ROCKS NEAR DUNDEE. 



line of junction between fig. 1. and 2. is indistinct* 

 The other extremity of this mass of sandstone, rests 

 upon the porphyry, fig. 5. In this last-mentioned 

 porphyry, fig. 3., there is a basin-shaped cavity, 

 fig. 4. which has been filled up with sandstone. 

 The strata of sandstone are parallel with the in- 

 clined edges of the cavity. The same bed of por- 

 phyry farther eastward seems to rest on the sand- 

 stone, fig. 5. ; but the appearances are indistinct. 



The sandstone, fig. 5., rests upon the mass of 

 porphyry, fig. 6. This last porphyry varies in 

 colour and composition in different portions of the 

 bed. Some portions are of a grey colour, with 

 imperfectly formed crystals of earthy felspar, while 

 , other portions are reddish- brown, and contam be- 

 sides the felspar a considerable number of crystals 

 of hornblende. This porphyry soon gives way to 

 another deposition of sandstone, fig. 7., both ex- 

 tremities of which rest upon porphyry, and ex^ 

 hibit an instance of an upfUling, 



The last mass of porphyry, fig. 8., is again co- 

 vered on its eastern side with another mass of sand- 

 stone, fig 9- This sandstone includes a bed of 

 greenstone, specimen 5. 



From the place where the last bed of sandstone, 

 fig. 9. commences, to the place called the Crescent, 

 the mineral appearances are but imperfectly dis- 

 closed, as may be seen in the figure, which, with 

 the specimens, will convey all the information 

 which I could obtain. 



