Revieivs — Permian Insect Remains from {Sydney. 87 



XI. — Permian Insect Remains from Sydnky, N.S.W. 



A Fossil Insect-wino prom the Poof of the Coal-seam in the 

 Sydney Harbour Colliery. By P. J. Tillyard. Proc. Linn. 

 Soc. KS.Wales, xliii, pp. 260-4, 1918. 

 fTIHIS specimen is the portion of the fore-wing of an Orthopterous 

 JL insect referred to the family Elcanidse, and described as 

 JElcanopsis sydneiensis, n.g. et sp. The horizon is Upper Permian. 

 Members of the family are already known from the Lias and Upper 

 Jurassic, and show an increasing tendency in their venational plan 

 to the Acridiidae of the present day. This new genus shows a still 

 greater reduction in the number of branches of the radial sector and 

 the number of cross veins, and suggests that the Acridioid plan 

 may have been formed by the addition of new elements to what was 

 originally a simpler and more open type of venation. 



XII. — Dlastrophic and other Considerations in Classification and 

 Correlation and the Existence of Minor Dystrophic Districts 

 in the Notocene. By J. Allan Thomson. Trans. ]Sew Zealand 

 Inst., vol. xlix, pp. 397-413, 1916. 



THE principles of diastrophism have been employed by Marshall, 

 Speight, and Cotton in the correlation of the younger rocks of 

 Hew Zealand. The succession of these rocks affords an example of 

 a cycle of sedimentation between two periods of earth-movement, the 

 middle of the cycle being marked by the occurrence of deep-water 

 limestones. These authors assumed that the limestones were every- 

 where of the same age, although the palseontological evidence was 

 incomplete. All the rocks formed between the early Cretaceous 

 (post-Hokonui) and Kaikoura (late Tertiary) disturbances were 

 named by Marshall the Oamaru system. Dr. Allan Thomson brings 

 forward evidence to show that sedimentation began at very different 

 times in different parts of the country, and that the Ototara, Otaio, 

 Amuri, and Whangarei limestones are not contemporaneous. These 

 limestones each represent a local maximum of depression due to 

 provincial warpings of different diastrophic districts. For all strata 

 deposited between the post-Hokonui and Kaikoura deformations the 

 name ISTotocene is proposed, in order to avoid the necessity for exact 

 correlation with the European Cretaceous and Tertiary divisions. 

 In the same way it is suggested that the most recent superficial 

 deposits, younger than the Kaikoura deformation, should be classed 

 as Notopleistocene, since in the absence of mammals it is impossible to 

 establish their equivalence with the subdivisions of the European and 

 American Pleistocene. Some of these recent formations have under- 

 gone a good deal of tilting ; in one place river gravels were observed 

 dipping at 12° to the south-east; this suggests that the Kaikoura 

 deformation lasted longer in some districts than in others and may 

 even yet be in operation locally. 



A description is given in an appendix of a new fossil, Pachymagas 

 ■abnormis, n.sp., from sand interbedded with the Mount Brown lime- 

 stone, "Weka Pass, Canterburv. 



R. H. R. 



