24 FOYE. 



mouth, huge blocks of the andesite, have tumbled into the stream 

 bed, and falls and rapids abound. 



The diorite-bearing conglomerate is not exposed in any of the stream 

 beds east of the Visari. Cross-sections up the Wai-ni-kuta and the 

 Lami, the next streams in order toward the east, show the marls 

 resting immediately on andesitic agglomerates. Up the Tamavua, 

 the most easterly and largest stream entering Suva Harbor, a number 

 of lateritized, maturely eroded hills of andesite are surrounded by 

 marls containing isolated boulders of the same andesitcs. Along one 

 of the branches of the Tamavua, entering 3 miles from its mouth, an 

 andesite-boulder conglomerate, with a slight amount of marl as a 

 matrix, outcrops. No contacts were seen, but the low dip of the beds 

 and the outcropping of andesitic agglomerates only a short distance 

 farther inland suggest that the conglomerate was eroded from the 

 interior andesitic hills. 



Numerous lenticular beds of coralliferous limestone occur within 

 the marls about Suva Harbor. One such bed, 20 feet in thickness, 

 is well exposed in a c^uarr}- just west of the town of Suva, on the east- 

 ern side of Walu Bay. The contact of the marl with the limestone 

 is transitional. Sandstones overlie the marl and are themselves 

 o\erlain by conglomerates enclosing broken shells in a calcareous 

 matrix; finally, reef-coral appears. It is thus seen that a bottom 

 composed of coarser shore-detritus is favorable to coral growth. 



The coral layers dip eastward at angles of 15° to 20°. These dips 

 may not represent the original angle of deposition, since numerous 

 faults have tilted the blocks of marl and limestone in many directions. 

 Three successive faults have dropped the coral limestone of Walu 

 Bay 45 to 50 feet. The downthrow is always to the northwest. The 

 faulting has given rise to a considerable duplication of the beds and 

 accounts for the irregularity of the limestone outcrop about Suva 

 Harbor. Up the Tamavua river a basal shell-limestone is associated 

 with a calcareous conglomerate which undoubtedly rests on maturely 

 dissected andesitic rocks. 



The dioritic rocks of the central core of \'iti Levu were not found in 

 place, but the\' occur in an ancient conglomerate. This conglomerate 

 is overlain by andesite flows, probably of the same age as the andesitic 

 materials overlying the folded and faulteil marls and limestones of 

 central Viti Levu. The andesitic flows and agglomerates have been 

 maturely dissected and a .series of conglomerates, marls, and inter- 

 bedded coral limestones laid down about the volcanic terrane, as in 

 the western part of the island. These coastal deposits were later 

 uplifted. 



