162 GLENDONITE FROM THE LOWER MARINE SERIES, 



more in length, and 2 to 3 inches in diameter. Both simple and 

 compound types occur, the latter being apparently haphazard 

 intergrowths of two or more individuals. 



In 1910, Dr. W. G. Woolnough* discovered a zone of glendonite 

 pseudomorphs in an argillaceous limestone, on the road from 

 Singleton to Dyrring, near the southern branch of Wattle Ponds 

 Creek. This horizon is about 1,480 feet below the base of the 

 Muree Beds. The crystals there are of the small, composite type. 



During 1912, Professor Woolnoughf found glendonites associ- 

 ated with Chcenomya in the topmost part of the Upper Marine 

 Series at Wollongong. These were in the form of hollow moulds in 

 the centre of concretions, similar to those which are found at M t. 

 Vincent. The base in which these concretions occur, is a tuffaceous 

 sandstone. 



In his report on "The Tasmanite Shale-Fields of the Mersey Dis- 

 trict," Mr. W. H. Twelvetreest has recorded the occurrence of 

 glendonite in the mudstones above the Tasmanite Shale-deposit. 

 The Shale is considered, by him, to be on the same horizon as the 

 Greta Coal-Measures in New South Wales, so that the horizion of 

 the glendonite-occurrence in Tasmania, corresponds to the lower 

 part of the Upper Marine Series in New South Wales. In the only 

 specimen that I have seen from the Tasmanian locality, the glen- 

 donites are of the smaller type, and are bunched together in com- 

 plex aggregates. 



The occurrence which forms the main subject of this note, is on 

 the main northern road, nearly half a mile beyond the junction of 

 that road with the road from Allandale Railway Station. (See 

 sketch, Fig.l, p. 160). '"1 



The horizon of these beds is 2,800 feet above the base of the 

 Lower Marine Series, and is nearly 2,600 feet below the lowest re- 

 corded horizon. It is about 150 feet below the well-known Harper's 

 Hill, green, tuffaceous sandstone. 



* Journ. Proc. Royal Soc. N. S. Wales, 1910, xliv., pp.557-559. 

 t Professor Woolnough very kindly gave me this information of his dis- 

 covery at Wollongong. 



^Dept. of Mines, Tas., Geol. Survey Bulletin, No. 11, 1912, p. 54. 



