BY VV. N. BENSON. 333 



wide, the other 300 yards long and 40 yards wide. The chemical 

 composition of a specimen of this mass is given below (No. 1787). 



A small mass of limestone next appears a mile to the south, 

 being found in a well sunk by the creek in Portion 32. 



No more limestone appears for over a mile, until, in the 

 southern part of Portion 31, a great band of red breccia is asso- 

 ciated with a small amount of limestone on its eastern side. 

 The red band broadens as it continues southwards into the Peel 

 River Company's Estate, and the limestone now appears to the 

 west, as well as to the east, of the Red Breccia, which is here 

 mor.e than a quarter of a mile wide. An important mass of 

 limestone lies on the western side of Sandy Creek, half a mile 

 south of the boundary of Loomberah Parish. It consists of 

 three portions, largely of red encrinital limestone. The aggre- 

 gate length of the outcrop is 600 yards, and the width 80 yards. 

 The dip is apparently W.40°S. at 50°. The upper portion is 

 rather ferruginous; the lower, grey portion is either massive or 

 brecciated. {See analyses 1785, 1786, infra). 



At the foot of Black Jack, the limestone and tuff is suddenly 

 cut off by a fault, which throws it half a mile to the east. On 

 the south side of the fault, the two masses of limestone, separated 

 by the breccia, are half a mile apart, but very soon they are 

 brought together again by a second great fault, and they continue 

 over the shoulder of Black Jack, making bold outcrops (analysis 

 1788), and pass thence down into Cope's Creek. The limestone 

 appears on the other side of the valley, and continues to Pipe- 

 clay Creek. This is the portion of the zone which was described 

 when considering the Geology of the Nundle District (3, p. 574). 

 In Cope's Creek, the limestone occurs in rather irregularly placed 

 masses in the red breccia, and one large lenticle has been torn 

 off and enveloped in keratophyre. It is possible that Clarke's 

 specimen of PhilUpsastrcea verneuilii was obtained here. 



Throughout its length, this limestone keeps the characters 

 which mark the Nemingha limestone. It is usually thorouo^hlv 

 crystalline, so much so that, except for the fossiliferous masses 

 on Mr. Carter's property and south of Cope's Creek, no recc- 

 nisable fossils have been obtained. The rock is generally white7J • '^^V^ 



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