BY A. B. WALKOM. 161 



the Upper Marine Series, and it had never been found in the 

 Lower Marine Series. A number of specimens were collected, and 

 examined to see whether they presented any differences from those 

 previously described. Mr. W. S. Dun kindly exhibited specimens 

 of these crystals for me, at the meeting of this Society held in 

 August, last year. 



In a paper on "The Occurrence of the Pseudomorph Glendonite 

 in New South Wales," by Professor David, Dr. Woolnough, and 

 Messrs. Taylor and Foxall,* a complete review of previous litera- 

 ture was given; and for a bibliography, the reader is referred to 

 that paper. They described the occurrence of glendonite at four 

 localities, representing four separate horizons in the Upper Marine 

 Series, as follows! : — 



(a)Glendon, 5 miles E.S.E. from Singleton. Horizon approxi- 

 mately 200 feet above the Muree Beds. The glendonites here occur 

 singly or in groups, and are from 3 to 12 inches in length. 



(b) Left bank of Hunter River, at Railway Bridge, Singleton. 

 Horizon about 1,000 feet above the Muree Beds. One glendonite 

 recorded from here, is composed entirely of ferruginous gypsum. 



(c) Mount Vincent, 14 miles south of East Maitland. Horizon 

 700 feet above the Muree Beds. The glendonites here frequently 

 take the form of hollow casts in the centre of an oval or elliptical 

 concretion. They occur singly or in aggregates. 



(d)Huskisson, Jervis Bay. Horizon about 200 feet below the 

 Nowra Grit, which is the equivalent of the Muree Beds. 



The size varies from an inch to over fourteen inches in length. 



In 1908, Mr. J. E. Carne| discovered glendonites on another 

 horizon, in the Upper Marine Series, namely, about 350 feet above 

 the top seam of the Greta Coal-Measures at Muswellbrook. These 

 glendonites are of the large type, measuring up to 9 inches and 



* Records Geol. Surv. N. S. Wales, 1905, viii., pp. 161-179. 



f The following details of these four horizons are taken from the paper 

 mentioned above, pp. 166-169. 



X Ann. Report Dept. of Mines N. S. Wales, 1908, p. 166. (The plan and 

 sections accompanying this report, were printed in the Annual Report for 

 1910, facing p.176). 

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