724 PERMIAN AND TRIASSIC INSECTS FROM N.S.W., 



in the establishment of a correlation between it and the Insect- 

 Bed at Ipswich. It is, in any case, impoitant to have both the 

 Wianamatta and Ipswich Beds definitely fixed as Upper Tri- 

 assic, a conclusion whicli Mr. Walkom's recent researches seem 

 to make fully justified. 



Section A. The Pekmian Insects. 



The ten specimens from the Newcastle Coal-Measures are 

 numbered 23 to 32 inclusive. Of these, Nos.23 and 32 were 

 taken from just above the Dirty Seam at Newcastle, at a place 

 near the Soldiers' Baths, about two feet above high water-mark. 

 Nos.24 to 31 inclusive come from the Belmont Fossil Beds, about 

 two miles on the Newcastle side of Belmont, a village on the 

 northern shore of Lake Macquarie, some three miles from the 

 Pacific Ocean. 



Both the Newcastle and the Belmont specimens come from 

 well within the Upper Coal-Measures. In Text-fig. 1, I offer a 

 section taken through the upper two thirds of these measures, 

 from the shores of Lake Macquarie up to Newcastle. This 

 section is simplified and abbreviated from Section No. 12, pub- 

 lished by Professor David in his well-known work on the Geology 

 of the Newcastle and Greta Coal-Measures (Mem. Geol. Survey, 

 New South Wales, Geol. No.i). It gives the succession of strata 

 from the top of the Coal-Measures (Wallarah Coal Seam) to a 

 vertical depth of about 850 feet (top of the Dirty Seam). Below 

 this, there lies a thickness of another 400 feet, not shown in the 

 figure, including the Borehole and Waratah Coal-Seams. 



Mr. Mitchell has kindly marked for me the exact positions of 

 the strata from which the insects were taken. The Belmont 

 Insect-Beds consist chiefly of hard cherts and shaly sandstones, 

 Iving at a vertical level of about 600 feet below the top of the 

 Upper Coal-Measures, and succeeded by a very thick stratum of 

 conglomerate, containing waterworn pebbles of coal. J:Jelow 

 this, in the actual section shown by Professor David, there is a 

 definite break in the geological sequence; but Mr. Mitchell 

 informs me that this break is only a local one, and not of much 

 consequence. Its only effect would be to increase somewhat the 



