Tlte Mnzarnni River. 149 



while near the mouths of small creeks flowing into the river banks of 

 pebbles of ironstone and of hornblende-schist are frequent, some of the 

 banks being of considerable extent. 



From below Burgomaster landing to about half a mile from Thorn- 

 hill's Landing, the exposures consist of ferruginous schists and hornbleiide- 

 porphyrite, in which, about half a mile below the latter landing, near 

 the left bank of the river, are large masses of glassy quartz 

 traversed by very numerous lusty-looking films. The samples of the 

 quartz collected assayed at the rate of thirty-seven grains of gold to 

 the ton of rock. 



Above Thornhill's Landino- are exposures of hornblende-porphyrite, 

 but as a rule in this neighbourhood the rocks seen are too much 

 altered and decomposed for determination. Aljout a mile nnd a half 

 above Thornhill's Landing there are some great masses of quartz on 

 the left bank, very similar in character to that below the landing, the 

 samples from which yielded gold at the rate of fifteen grains per ton of 

 the rock. Between these masses of quartz and Barnard's Landing 

 only ironstone and ferruginous gravels are exposed. In the course 

 of the river above Barnard's Landing are several exposures of rock 

 consisting of more or less schistose t{uartz-porphyrite. Near and 

 above the mouth of the Mara-Mara Creek Jari;e masses of quartz- 

 porphyrite are seen which contain, in places, many cubes of pyrite. 



The path leading into the forest behind Thornhill's Landing passes 

 for some miles over gravels largely made up of concretionary ironstone 

 pebbleb-, and in places over masses of ironstone-conglomerate, the 

 only unaltered rock exposed being an amphibolite. 



