144 Dr. Fitton on the Geology of Australia. 



Gkeville Island, near the entrance of Prince Regent's 

 River. — Reddish, coarsely granular, siliceous sand-stone ,• in 

 horizontal strata, intersected by veins of crystallized quartz*. 



Half- Way Bay, within Prince Regent's River on the west 

 of the entrance, near Greville Island. — Hornblende rock? 

 nearly agreeing with that of Pobassoo's Island, on the north- 

 west of the Gulf of Carpentaria, (See above, p. 141.) Calce- 

 dony, apparently from nodules in amygdaloid. Greenish quartz, 

 approaching to heliotrope. Red somewhat slaty jasper, mixed 

 with quartz and calcedony, and containing specular iron ore. 



The specimens from this place much resemble some of those 

 from Sotto i Sassi, in the Val di Fassa in the Tyrol, which I 

 have seen in the collection of Mr. Herschel; and which con- 

 sist of reddish jasper with calcedony, and a greenish flinty 

 stone, like heliotrope, — the whole belonging to the trap-for- 

 mation. 



Point Cunningham, east of south from Cape Leveque,and 

 about one hundred and fifty miles south-west of Prince Re- 

 gent's River. — Very compact and fine-grained reddish gra- 

 nular quartz, with a glistening lustre, and flat conchoidal frac- 

 ture. This stone, though so compact in the recent fracture, 

 has distinct traces of stratification on the decomposed surface, 

 which is of a dull reddish hue. Bright red ferruginous gra- 

 nular quartz, (Eisen-kiesel?) with a glistening lustre, and a 

 somewhat porous texture. A specimen of " the soil of the 

 hills" at Cygnet Bay, consists of very fine reddish-yellow 

 quartzose sand. A large rounded pebble, consisting of ferru- 

 ginous granular quartz, of a dark purplish-brown colour, and 

 considerable density, was found here ; near a fireplace of the 

 natives, by whom it is used for making their hatchets ; with a 

 fragment of a, calcareous incrustation, like that of the west coast 

 hereafter mentioned. 



The next specimens in Captain King's collection, — a space 

 of more than three hundred miles on this coast not having 

 been examined by him, — are from Malus Island, in Dam- 

 pier's Archipelago (See Narrative, vol. i. p. 56): — they con- 

 sist of fine-grained green-stone, and what appears to be a ba- 

 saltic rock, of amygdaloidal structure. 



Dirk Hartog's Island, west of Shark's Bay. — A com- 

 pound of rather fine-grained translucent quartzose sand, ce- 

 mented by carbonate of lime, of various shades of reddish and 

 yellowish gray. This stone has in some places the structure 

 of a breccia ; the angles of the imbedded fragments, which are 

 from half an inch to two inches in diameter, being very distinct : 

 — but in other parts, the fracture exhibits the appearance of 

 * Narrative, vol. ii. p. 53. 



roundish 



