CARBONIFEROUS AND PERMO-CARBONIFERODS ROCKS, N.S.W. 269 



contains an abundance of very large boulders ; the largest 

 of these consist of a rock identical with the underlying 

 Paterson rhyolite; these rhyolite boulders range up to 12 

 feet in diameter. Boulders of many other rocks also occur 

 ranging up to several feet in diameter; these include 

 granites (quite a number of varieties) quartz-porphyries, 

 gneiss, amphibolite, quartzite, etc. These rocks must have 

 come from a considerable distance, as no occurrences of 

 similar types are known anywhere in the vicinity. Large 

 boulders are not limited to the base of this bed, but occur 

 throughout; many of these are subangular and faceted, 

 while some show glacial striae* The groundmass in which 

 the boulders are embedded varies considerably, in some 

 places it is coarse, not unlike a coarse tuff, in other places 

 it consists of exceedingly fine material, like glacial mud. 

 Striated pebbles occur but are not very common, and the 

 only rock of the many which occur which exhibits ice 

 scratches is the quartzite; these besides being scratched 

 are often faceted. This bed outcrops prominently along 

 the road going north from Seaham, particularly at Felspar 

 Creek about one and a half miles north of Seaham. While 

 this bed in parts resembles a true tillite much of it might 

 be compared with the outwash from a glaciated region as 

 the percentage of glaciated pebbles is small, while the 

 groundmass in which the pebbles are embedded, only in 

 places resembles that of a true tillite, it is therefore referred 

 to as a fluvio-glacial conglomerate. (See Plate XXVIII.) 



The No. 2 bed is not so characteristic as No. 1, being 

 more like an ordinary conglomerate, but contains some 

 striated pebbles. The No. 3 bed is a true tillite, and out- 

 crops at the turn of the Seaham-Maitland road just south 

 of the township, and is the most typical of the tillites of 

 the district. It consists of consolidated glacial mud show- 

 ing little or no evidence of stratification, in which are 



