474 THE CONTINKNTAL ORIGIN OF FIJI, 



forms a bar across the stream and gives rise to a small cascade at 

 a point called Nadranikula (Plate xxx., fig. 13). The rock is much 

 jointed but not very much decomposed. The main joints dip 

 E. 66° S. at 65°; E. 38° N. at 73°; N. 3° W. at 80°; and E. 10° 

 K at 77°.* 



The rock is a moderately coarse-grained holocrystalline mass of 

 a light grey colour. In it quartz and felspar are both very 

 abundant. Hornblende is also largely developed, and biotite to a 

 slightly smaller extent. Magnetite is present in normal quantity 

 for a somewhat basic variety of granite. Under the microscope 

 apatite and sphene also appear. The joint faces are coated with a 

 little yellow decomposition product. This rock continues to out- 

 crop strongly and continuously for a considerable distance. It 

 makes rather rough country. From Nadranikula to the summit 

 of the pass (Navunitorilau) is about four or five miles. No really 

 solid outcrops occur for the last mile or so, but the rock 

 undoubtedl}'- continues, as decomposed outcrops are met with. 

 The summit of the pass is 1290 feet above sea-level (aneroid). 



From this point another excellent view of Korobasabasaga (Plate 

 xxviii., fig. 1 1 ) and other similar mountains is obtained. The ridge 

 of Navunitorilau forms the main divide between the Navua and 

 Wainiraala Rivers. The latter is the principal tributar}^ of the 

 llewa. The northern side of the ridge is, like the southern side, 

 composed of plutonic rocks. These for the most jDart are repre- 

 sented by quartz diorites. In places the rock, which is yellowish- 

 white in colour, is so thickly spotted with nearly black basic 

 secretions that one is tempted to coin the term '^ leopard rock " 

 for it. The character of the outcrops in the bed of the creek 

 which forms the track do not change materially for about five 

 miles. 



At a point about one-quarter of a mile above the village of 

 Nasava, the track crosses an alluvial flat. No outcrops are seen 

 for a similar distance the other side of the village, when an 



* The direction and dip of the joints here and in other exposures is given 

 in detail, as a comparison at some future time, when more data are available, 

 may give some information as to direction of action of earth movements. 



