BY A. B. WALKOM. 125 



is on about the same horizon as the Harper s Hill beds further 

 north. Their thickness is rather difficult to estimate at all 

 accurately on account of some doubtful faulting which occurs 

 just north-east of Mt. View, but it is quite 600 feet, possibly 

 more. This conglomerate was evidently deposited close to the 

 old Carboniferous islands, the rocks of which have been described 

 elsewhere.* The conglomerate is here followed by a develop- 

 ment of basalt and tuft's, attaining a thickness of about 440 feet. 

 The basalt contains numerous steam holes filled with such minerals 

 as natrolite, datolite,f analcite, etc. The tuft's overlie the basalt, 

 for the most part, and contain marine fossils. The position of 

 the centre from which these basalts and tuff's were poured out, is 

 doubtful. A couple of small patches of olivine basalt have been 

 observed, quite isolated and in the midst of the acid volcanic 

 rocks of the Carboniferous inlier of Mt. Bright. The most 

 reasonable explanation of these occurrences seems to be, that 

 they are old volcanic necks, and they may represent the old 

 pipes from which this series was erupted. The tufts are followed 

 by 650 feet of calcareous mudstones. One hundred and fifty 

 feet above the base of these mudstones, there is a well-marked 

 development of limestone containing numerous well-preserved 

 Foraminifera, which have been described by Messrs. Chapman 

 and Howchin.t 



This bed of limestone is on the same horizon as those men- 

 tioned above(p.l22). Ostracods are found in these beds, as well 

 as numerous marine fossils, e.g. 



Crinoid stems. Avictdopecten tenuicollis. 



Stenopora tasmaniensis. A. sprenti. 



Fenestella(1), 2 or 3 species. A. squamuliferus. 



l*rotoretepora. Deltopecten farleyeitsis. 



Spirifer tasmaniensis. Mceonia carinata. 



S. duodecimco statu Pachydomus, 3 or 4 species. 



Martiniopsis subradiata. Ptyco7nphalina(l). 



Aviadopecten mitchelli. 



* Journ. Proc. Royal Soc. N. S. Wales, 1911, xlv., pp.379-408. 



t C. Anderson, Rec. Austr. Museum, 1904, v., pp.127-130. 

 X Mem. Geol. Survey N. 8. Wales Palaeontology, No. 14, 1905. 



