586 W. H. HUDLEST03ST ON WEST-ATTSTKALIAN 



palseontological point of view, and affords a further testimony to the 

 extent and importance of the Carboniferous formation on the Austra- 

 lian continent. 



Rock-specimens. — A few small rock-specimens accompany Mr. 

 Forrest's collection ; and as he has been careful to mark the localities 

 on the accompanying map, it would have been possible to make a 

 sort of guess as to the nature of some of the formations even without 

 the aid of Mr. Gregory's section. The specimens collected by Mr. 

 Forrest, being for the most part from the basin of the Gascoyne 

 river, enable us to test, as it were, Mr. Gregory's section, which, on 

 the whole, they seem to confirm. 



Subjoined is a brief description of the more important rock-speci- 

 mens, with references to the localities whose petrology they are 

 intended to illustrate. 



The character of No. 1 may be gathered from the numerous fossils as 

 well as from the small rock-specimen so labelled. We thus arrive 

 at the conclusion that the " Range containing fossils " is, in the 

 main, composed, of a limestone-grit varied by sandstones and flaggy 

 micaceous grits. Some of the fossil casts occur as a ferruginous 

 fine-grained sandstone without lime, and sometimes as a dark 

 hornstone or chert. Some of the Fenestellce occur in a flaggy 

 calcitic limestone which is tolerably pure. The corals also are 

 calcareous, and the interior of the tubes filled with calcite. 



No. 2. There are three specimens with this label. One is the 

 cast of an OrtJiis in a ferruginous fine-grained sandstone. The 

 others are flaggy, fine-grained, and somewhat micaceous sandstones 

 without a trace of carbonates. On turning to the map, we perceive 

 that these specimens come from the S.E. side of the Kennedy Range, 

 facing the junction of the Lyons and Gascoyne rivers. Thus it is 

 not improbable that here also is a sandstone formation homotaxially 

 Carboniferous. The higher portions of this range are marked as 

 possibly Cretaceous in Mr. Gregory's section. 



No. 7. This lot comes next according to topographical arrange- 

 ment. The specimens are derived from the opposite side of the 

 Lyons river ; between it, in fact, and the southern prolongation of 

 the " Range containing Fossils." One is a soft, grey, micaceous, 

 flaggy sandstone, and the other a dark grey, micaceous shale, with 

 markings which may be fucoidal. I think that No. 7 represents 

 the detached summit, immediately east of the Lyons river, marked 

 e in Mr. Gregory's section, and according to that section a Cretaceous 

 outlier. 



No. 3 is from the east side of the " Range containing Fossils," 

 between it and the northerly bend of the Gascoyne River, about the 

 position where the crystalline rocks are first shown as coming to the 

 surface in Mr. Gregory's section. Accordingly we find this specimen 

 to be a coarsely crystalline aggregate of silvery mica with quartz, 

 the rock being stained pinkish in places from oxidation of iron in 

 the mica. It is the most highly crystalline of all the rock-speci- 

 mens. Those under the label No. 4 are varieties of quartz, some 



