CARBONIFEROUS AND PERMO-CARBONIFEROUS ROCKS, N.S.W. 307 



An important feature of this section is that there are 

 two distinct tillite horizons separated from one another by 

 marine strata containing characteristic Permo-Oarbonifer- 

 ous fossils. Keenia (f. Dr. W. G. Woolnoagh) occurs in 

 abundance actually in the basal portion of the Upper tillite 

 bed. Both horizons are below a considerable mass (approxi- 

 mately 1800 feet) of marine strata. In ascending order 

 we next meet Glossopteris coal measures (the equivalent 

 probably of the Greta Ooal-measures of New South Wales) 

 and then succeed freshwater strata, up to the base of the 

 unconformably overlying Jurassic strata. The Jurassic 

 strata are there horizontal, whereas the Permo-Oarboni- 

 ferous coal seams are dipping at an angle of about 10°. In 

 this freshwater stage of the Permo-Oarboniferous, three 

 seams of coal have been observed. These in descending 

 order are respectively 5 feet, 2 feet, and about 3 feet thick, 

 and contain hydrous coal with from 22% up to 24% of 

 moisture. 1 



Mr. A. Gibb Maitland seems correct in considering them, 

 though hydrous, the equivalent of the Greta Goal Seams. 

 In his address to the Geological Section of the Aust. Assoc. 

 Adv. Sci. for 1907, Mr. Maitland records having found 

 u Lower Marine" fossils below the horizon of these coal 

 seams. There is little doubt but that these are approxi- 

 mately the equivalents of the Greta Coal Measures of 

 Eastern Australia. Blocks up to 18 inches in diameter, 

 evidently dumped from floating ice, occur at intervals in 

 the freshwater beds associated with the Irwin River Goal 

 Seams. 



The horizon of Agathiceras micromphalum just below 

 the base of the coal-measures recalls the well known 

 horizon for this fossil in New South Wales in the Ravens- 



1 Dr. W. G. Woolnouorh informs me that a coal seam eight feet thick 

 has just been discovered there. 



