b BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



(1) Bluish gray hard limestones without macroscopic fossils, and dip- 

 ping at steep angles. This was seen only in the Singatoka area, Viti 

 Levu, where it underlies the bedded foraminiferal limestone. 



All the specimens of this have been forwarded to you, and this rock, 

 as being probably the oldest hitherto observed in Fiji, should be worthy 

 of careful microscopic examination. It may possibly have some relation 

 to the Globigerina limestone of the Solomon Islands, and that recently 

 brought to Sydney by Mr. Danvers Power from Noumea in New Caledonia, 

 which is also a Globigerina limestone. 



(2) Volcanic rocks, such as spherulitic rhyolites and diabasic dolerites, 

 which must have supplied the well-rolled pebbles in the conglomerates 

 of the Fiji soapstones. 



(3) (a) " Bedded limestones." These are developed, as observed, by 

 Mr. Andrews chiefly at the Singatoka area. Their angle of dip is 15°, 

 and they are largely foraminiferal (forms like Amphistegina, Globigerina, 

 Textularia, etc., being well represented), mixed with fragments of nulli- 

 pores, gastropod and lamellibranch shells, polyzoal skeletons, fragments 

 of echinus spines, etc. As you will see from the specimens sent, this is 

 distinctly not a coralline limestone, but rather a foraminiferal nullipore 

 rock. If the planes of bedding represent originally horizontal planes 

 which have been subsequently tilted so that they now dip at 15°, the 

 thickness of these bedded limestones at the Singatoka area, as measured 

 by Mr. Andrews, cannot be. much less than 1500 feet. 



Outcrops of similar limestones have been observed by Mr. Andrews at 

 the raised atoll of Mba Vatu, Vanua Mbalavu, in the Lau Group, where 

 they form the foundation rock upon which the raised limestone rock 

 rests. 



(b) Calcareous fossiliferous volcanic conglomei'ates probably passing 

 in places into the "soapstone" formation of Fiji, the latter being a 

 foraminiferal submarine volcanic tuff and tufaceous foraminiferal mud- 

 stone. 



These may be slightly newer than, or possibly contemporaneous with, 

 the foraminiferal " bedded limestones" of the Singatoka area. 



In the Lau Group the}' are seen at Mango, where, as shown on the 

 left-hand side of the upper of Mr. Andrews' sections, they form the basal 

 rock on which the raised reef limestone rests (Plate 2). 



A thickness of only about four feet is exposed at Mango. They ap- 

 pear to be associated in places at Mango, as observed by Mr. Andrews, 

 with a steatitic fine basic tufaceous rock, homotaxial perhaps with the 

 Suva " soapstone." 



