1196 NOTES ON THE GEOLOGY OF BOWNING, N.S.W., 



Derringullen Creeks to the Yass River, the following rocks appear 

 in the order named — conglomerates, shales, impure limestones^ 

 limestone, incoherent micaceous sandstone, coarse sandstones and 

 flagstones, and porphyry. 



In the western division, starting from the porphyry ridge and 

 proceeding from east to west, first appears a bed of fossiliferous 

 shale, the decomposition of which has formed a fertile loamy soil. 

 Beyond this, as seen on the Binalong Road, are some veins of jasper, 

 and a bed of sandstone containing minute fossils. West of these 

 rocks to the boundary of the Parish at Flinter's Gap on G-. S. Road, 

 all the rocks exposed appear more or less altered, though 

 undoubtedly of sedimentary origin. A large proportion of them 

 are cherty in character, and some are porphyritic. 



At Murray's Hill and along the N. W. boundary of the parish 

 porphyry intrudes. The southern part of this division I have not 

 had the opportunity of examining fully ; but from a casual 

 inspection the rocks seem less altered, and sandstones occur in 

 several places. About three miles 8. W. of the township a remarkable 

 felsitic grit is exposed shewing some fossils. Through this grit 

 E. and W. runs a diorite dyke, the grit on each side of it 

 merging gradually into the diorite. Through the diorite runs a 

 quartz vein bearing a good per centage of copper and galena with 

 a little silver. In this place also is a small outcrop of limestone 

 in which a few fossils are imbedded. It is worthy of remark here 

 that the same limestone is visible in the Two-mile Creek about 

 a mile to the east, and on the opposite side of the porphyry ridge, 

 thus showing that the porphyry is intrusive. 



Position of the stratified rocks. — The stratified rocks have all 

 undergone change from their original position, and are considerably 

 tilted and folded, but maintain throughout conformability, as well 

 as a regular strike and dip. 



The general strike is a little E. of N., and the dip N. of W. 

 The dip varies from 5° to as much as 87°. The eastern division 

 forms a synclinal basin, having been tilted on the W. side by the 



