FIELD GEOLOGY. 205 



REFERENCE 

 TO "PTO 91 



LOWER TRIAS ^\-'/'-\BU HTSH SANDSTONE. 



MIDDLE PERHIAN. ^=[ HA6NESIAH LIMESTONE 



LOWER PERU IAN*.... 



UPPER 

 CARBONIFEROUS. 



..} ^3$ LIMESTONE 



OYKC 



In Quarries No. 1 and 2 we found sandstones, sand, 

 and marl, with thin partings of shale, the latter slightly 

 effervescent. The former were of a reddish-brown 

 colour, very micaceous, and small patches of a whitish- 

 looking rock, soft and minutely crystalline, were ob- 

 served. This substance did not effervesce upon appli- 

 cation of acid, and was scratched even by the nail ; it 

 is therefore Gypsum. Quarry No. 3 was being worked 

 on an extensive scale for building purposes ; the stone 

 derived from it varied considerably in texture, might be 

 readily scratched with a knife, effervesced slowly, and 

 was of a grey colour. The compact beds were very fos- 

 siliferous, broke evenly with a dull lustre, and those of 

 crystalline texture presented a conchoidal fracture and 

 possessed a vitreous lustre. The rock is almost certainly 

 Magnesian Limestone passing gradually into Dolomite, 

 but the evidence derived from the fossils will be con- 

 clusive. 



The notes taken in the quarries are recorded below : 



