COAL MEASUKES OF N.S.W. AND ASSOCIATED ERUPTIVE ROCKS. 261 

 Teet. Inches — Thickness. 



570 Tomago (East Maitland) Coal-measures. Freshwater 

 beds containing an aggregate thickness of about 45 feet 

 of coal, and a similar flora to the preceding. 

 5,000 (about) — Upper Marine Series, containing a marine 

 fauna of Permo-Carboniferous affinities, and a few corals, 

 principally Stenopora. Specially characterised by the 

 predominance of Productus brachythcerus. Large 

 erratics of granite, slate, and quartzite occur near the 

 lower half of this division. 

 300 Greta Series, freshwater productive coal-measures con- 

 taining a similar flora to the Tomago and Newcastle 

 Coal-measures, and an average aggregate thickness of 

 abont 20 feet of coal. 

 2,000 (about) — Lower Marine Series, containing a marine 

 fauna somewhat similar to that of the Upper Marine, 

 but comprising exceedingly few corals. Specially charac- 

 terised by the predominance of Eurydesma cordata. 

 In the Illawarra District it is probable that both the Newcastle 

 and Tomago Coal-measures are developed, and that the Dempsey 

 Series have almost entirely thinned out. It is also possible that 

 the uppermost coal measures there developed may represent the 

 upper portion of the Newcastle Series, and that the Tomago 

 measures mav have thinned out before reaching the Illawarra 

 District, owing to a slight unconformity between the top of the 

 Upper Marine Series and the base of the Tomago Series. The 

 following is a descending section of the Glossopteris group, as 

 developed in the Illawarra District in the neighbourhood of Nowra: 



Feet. Inches — Thickness. 



200 (about) — Bulli Coal-measures, containing an aggregate 

 of about 45 feet of coal where more fully developed, 

 near Bulli. 

 700 (about) — Dolerite andesites and basalts, with laumonite 



and often zeolites. 

 150 Red tuffs. 



100 Doleritic andesite with metallic copper in minute quan- 

 tities, occurring interstitially in joints. 

 2,500 Upper Marine Series containing a Permo-Carboniferous 

 marine fauna, Productus brachythcerus and Stenopora 

 being specially characteristic. 

 150 (about) — Clyde (Greta) Coal-measures. Total coal about 

 nine feet thick. 

 50 (about) — Sandstones and quartz-breccias without fossils, 

 perhaps the equivalents of the Lower Marine Series. 

 These rest unconformably on vertical Silurian slates. 

 r In the Mittagong and Blue Mountain Coal-fields the coal seams 

 at present being worked are the equivalents of the Bulli Coal- 

 measures. The marine beds which there underlie the productive 



