44 W. G. Lav g ford: 



east of the Xewlands Street West bridge over the xMerii Creek in the 

 creek bed. 



No. 2 is a typical micaceous sandstone. It is a yellowish loosely 

 compacted rock showing quartz grains and Hakes of muscovite. 

 Microscopically it shows quartz, niuscovite and tourmaline. This 

 specimen was obtained from the road section just west of the 

 cemetery in Elizal^eth Street. 



No. 4a is a light yellow mudstone. Microscopically all that can 

 be recognised are minute fragments of quartz and nmscovite set in 

 a micaceous clayey groundmass. Spots of reddish-brown mineral 

 with cubical oiitlines are possibly limonite after pyrite. It was 

 obtained just to the west of the Newlands Street West bridge over 

 the Merri Creek. 



(b). Moonee Ponds Creek Specimens. — No. 3 is a dark, fine- 

 grained sandstone, splitting well along the bedding planes. The 

 split faces are covered with small flakes of muscovite. The rock 

 shows dark bands. Microscopically the section shows quartz, mus- 

 covite, biotite, altered plagioclase, oligoclase (fresh), zircon, tour- 

 maline, rutile, and ilmenite or magnetite, and dark bands of car- 

 bonaceous material. Some of the quartz grains contain inclusions 

 of apatite. The tourmaline shows good crystal faces in some cases. 

 Secondary minerals present are sericite, chlorite after biotite, a 

 little carbonate, and limonite. The specimen was obtained from a 

 cliff section on the creek about 100 yards north of the Brunswick 

 Road bridge. 



(c). Hawthorn Specimens. — No. 5 was obtained from a small 

 point on the left bank of the River Yarra, just below the bend 

 up stream from the Glen Tea Gardens. It is a dense grey sand- 

 stone, showing quartz and muscovite. Deposition oi limonite has 

 taken place along joint planes. 



The section shows quartz, muscovite, tourmaline, zircon, fresh 

 oligoclase and altered plagioclase, magnetite or ilmenite, leucoxene 

 and green biotite, also possibly sphene. Some carbonaceous matter 

 is present. Secondary limonite and sericite and clayey interstitial 

 matter are also present. 



{d). Kew Specimens. — i., Victoria Street Bridge Section — Rock 

 No. 17 from the north side of Victoria Street at the top of the hill 

 above the bridge is a fine grey sandstone traversed by veins of limo- 

 nite and secondary quartz. Microscopically the section shows 

 quartz, muscovite, tourmaline, zircon, and carbonaceous material, 

 set in a fine groundmass of quartz and sericite. Sericite after 

 felspar is common. The secoTidary (juartz veins are probably later 



