250 C. A. SUSSMILCH AND T. W. E. DAVID. 



4. In 1907 Professor T. W. E. David 1 in his Monograph 

 of the Hunter River Coal Measures, traversed and mapped 

 the junction of the Permo-Oarboniferous and Carboniferous 

 formations of this Lower Hunter District, and made brief 

 reference to the nature of the Carboniferous inliers which 

 occur at Pokolbin and Drake's Hill, south of the Hunter 

 River. 



5. In 1911, Messrs. A. B. Walkom and W. R. Browne 2 

 described in detail, the Carboniferous lava flows of the 

 Pokolbin District ; the section described by them belongs to 

 the Kuttung Series, and consists largely of volcanic rocks* 



6. In 1913, Prof. W. N. Benson 3 described in some detail 

 the Carboniferous formation as developed in the Barraba- 

 Tam worth District. In this region he subdivided the Car- 

 boniferous strata into two divisions as follows: — 



The Rocky Creek Conglomerate (including lava flows),. 



thickness 2,000 feet. + 

 The Burindi Mudstones, thickness 1,500 feet.+ 



He refers the whole of these strata to the Lower Car- 

 boniferous. In this paper he gives a detailed list of the 

 Carboniferous fossils for the district he is describing, and 

 also a list of the fossils for the district now under discussion. 

 This list he has recently revised and he has kindly allowed 

 me to make use of the revised list here. 



The Burindi mudstones are described as being fine, dark 

 grey, fissile mudstones with bands of andesitic tuff and 

 occasional coarse-grained breccias, with here and there 

 thin bands of crinoidal limestones and oolitic limestones. 



1 The Geology of the Hunter River Coal Measures by Prof. T. W. E. 

 David, b.a., f.r.s., f.g.s., Memoir No. 4, Geol. Surv. N.S.W. 



2 The Geology of the Eruptive and Associated Rocks of Pokolbin, New 

 South Wales, this Journal, 1911, pp. 379-407. 



3 The Geology and Petrology of the Great Serpentine Belt of New 

 South Wales, Part I. by W. N. Benson, b.a., d.sc, Proc. Linn. Soc. N.S.. 

 Wales, Vol. xxxvin, Part 3, 1913, p. 490. 



