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Geological Society, 147 



municated by W. H. Fitton, M.D., F.G.S., begun at the Meeting 

 held on the f^rd of December, was resumed and concluded. 



This paper was accompanied by a series of specimens made by 

 the author, who states that he had submitted it to the examination 

 of Dr. Fitton, and that he is indebted to the notes of that gentleman 

 for the geological descriptions embodied in the memoir. 



After alluding to the Wingen or Burning Mountain, situated on 

 the south-eastern side of the *' dividing range," the author states 

 that the summit of the range, at the point where he crossed it, con- 

 sists of greenstone slate, and the base of a quartzose conglomerate. 

 Having descended the range, he traversed the low hills which form the 

 eastern side of Liverpool Plains and consist of a similar conglome- 

 rate; and afterwards the hills to the north of the Plains composed of a 

 very finely grained granite. Between the latitudes of 31 andSO degrees 

 the country gradually ascended from the level of Liverpool Plains, 

 or 84-0 feet, to nearly 2000 feet above the level of the sea, and pre- 

 sented a broken irregular surface, often traversed by low ridges of 

 clay slate. To the north of 30° lat. the exploring party entered a 

 fertile valley, called by Mr. Cunningham Stoddart's Valley. The 

 base of the ridges by which it is bounded, consists of serpentine, 

 and their flanks and summit of hornstone; and the hills at the head 

 of the valley of clay -slate. In the bed of Peel's River, which crosses 

 the northern extremity of the valley, the author noticed a thin ho- 

 rizontal bed of calcareous sandstone, between strata of indurated 

 clay or shale. The country for 50 miles to the north of Peel's 

 River exhibited a moderately undulating surface, covered in some 

 parts with fragments of cellular trap ; and the hills which bounded 

 the route on the westward, as far as the parallel of 29° 10', consisted 

 of a reddish coarse-grained sandstone in nearly horizontal strata. 

 Beyond this point Mr. Cunningham directed his journey to the 

 north-east, and a little to the north of 29° lat. he arrived at Mogo 

 Creek, the banks of which were found to be composed of a coarse 

 friable sandstone. Pursuing the same direction, the country for 40 

 miles presented a rugged surface, and the prevailing rocks were 

 sandstone and clay slate ; but occasionally the tops of the hills 

 formed low terraces composed of a quartzose conglomerate. In 

 the bed of a creek in lat. 28° 26, and in the meridian of Paramatta, 

 (151° east long.), a hard slaty rock was noticed ; and the country 

 beyond it was found to be composed, where it could be examined 

 in the dry water-courses, of flinty slate, in lat. 28° 13' the party 

 entered upon a fertile district which extended for 18 miles, or to the 

 foot of the Dividing Range in the parallel of 28 degrees. At the 

 base of these mountains Mr. Cunningham procured specimens of 

 basalt containing olivine; at the height of 1877 feet above the level 

 of the sea, the rock consisted of amygdaloid ; and the extreme sum- 

 mit, 4100 feet above Moreton Bay, of a brick-red cellular trap, the 

 cells having an elongated form and parallel position. 



From this station the author directed his course back towards 

 Hunter's River, but chose a route to the eastward of that by which 

 he had arrived at the foot of the Dividing Range. In a ravine about 

 20 miles from the extreme point of his journey, and on the confines 



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