Notes on the Geology of the Country around Goulburn. 67 



southern continuation of Towrang Hill, and thence to Goulburn. 

 The places to the west of Goulburn where it passes are Baw Baw, 

 Poineroy, Mount Fitton, and Gullen, where it reaches the 

 dividing range. The scale is two inches to a mile, both 

 horizontally and vertically. This section displays all the varieties 

 of rocks previously alluded to, except the conglomerate of the 

 coal formation. 



Granite forms the bed of the Shoalhaven at the starting point, 

 and in the course of a mile or less gives place to highly 

 inclined schists and slates and quartzites, mostly thin bedded. 

 These are here thickly covered in many places by ferruginous 

 breccia which I shall allude to presently. These ancient and 

 altered sediments continue along the section line for six miles 

 exhibiting several anticlinal and synclinal folds ; and are then 

 cut out for a mile by an outburst of basalt. Crossing this, 

 quartzite is found on the other side, and also a stratum of lime- 

 stone containing a few fossil shells and corals, Favosites, 

 Stromatopora, a large Pentamerus, Orthis, Rhynconella, and 

 crinoid stems. Further on we pass over masses of syenite and 

 quartz porphyry. Then again across the edges of altered 

 stratified rocks, then over another tract of syenite and granite ; 

 and here we reach Lumley Creek. This is a most interesting 

 spot, and it long ago received the attention of Mr. Clarke, who 

 pointed it out to me. The granite suddenly disappears at the 

 creek, and the opposite bank exposes a soft limestone made up 

 of flexuous layers, and overlaid by a calcareous sandstone full of 

 fossils ; among which Atrypa, like A. hemispherica, aud Spirifer, 

 like S. plicatellus, also the subgenus Cyrtia are the most 

 abundant. Leaving this spot the section line next crosses 

 Bungonia Creek winding between steep banks of quartzose and 

 slaty strata ; and thence over the Jerrara Hills and the spurs of 

 Towrang, a monotonous and barren ten miles of highly inclinal 

 unfossiliferous strata until the top of Governor's Hill is reached, 

 which commands a magnificent view of Goulburn and the sur- 

 rounding plains. From this range the section line is continued 

 eight miles west, first crossing the Mulwaree, passing through 

 the south part of Goulburn, and then descending into the valley 

 of the Wollondilly, which it crosses, at an uninhabited township, 

 Baw Baw, and thence follows up the valley nearly parallel with 

 the river's course. From the Mulwaree the country is flat, and 

 there is no change in the character of the rocks, except just at 

 Baw Baw, on the Wollondilly, where a stratum of limestone is 

 interbedded with the schists and quartzites. It contains but few 

 fossils, but among them Favosites, and the same Pentamerus as 

 before mentioned were observed. The rest of the section runs 

 N.W., still following up the Wollondilly Valley, passing for 

 three miles over schists and quartzites, and then entering a 



