GEOLOGY OF THE KEMPSEY DISTRICT. 161 



of most handsome appearance; the groundmass is light 

 grey, and through it are scattered very abundant pheno- 

 crysts of white felspar up to one-third of an inch diameter 

 and less conspicuous crystals of dark hornblende. When 

 polished it should make one of the most beautiful building 

 stones imaginable. 



Connected with this mass are numerous sills of light- 

 coloured, fine-grained felsitic rock, intruding the black 

 sediments lying to the north of the Oape. At Arakoon 

 there is a small boss of granite whose junction with the 

 dark sedimentary rocks to the south of it is a very con- 

 spicuous feature in the cliff section. The granite varies 

 from grey to pink, the latter colour being produced by an 

 abundance of large idiomorphic, flesh-coloured, crystals of 

 orthoclase. In the quarry face at the Trial Bay Prison 

 the granite is seen to be crowded with large angular blocks 

 of intensely altered sedimentary rock, and, as the junction 

 line is approached, these masses become larger and more 

 numerous till they attain dimensions up to 40 feet in length. 

 The granite mass is quite a small one and does not extend 

 as far as South West Rocks where the slaty rocks again 

 put in an appearance. At the New Entrance to the Mac- 

 leay the quarries for materials for the breakwater expose a 

 remarkable conglomerate. In general appearance and in 

 the sporadic distribution of its pebbles it suggests a glacial 

 till, but I have no distinct evidence for or against such an 

 idea. Between this isolated mass of highland and Kempsey 

 stretch the alluvials and swamps of the Lower Macleay. 



Another coastal headland further south, Orescent Head, 

 deserves mention. The headland itself consists of greyish 

 shales and sandstones dipping in a northerly direction. 



During the time at my disposal I searched for fossils but 

 found only undeterminable plant remains, probably Equi- 

 setacece of some kind. 



K— August 2, 1911. 



