610 
APPENDIX. 
[C. 
consist of a sandy calcareous cement, including water- worn 
portions of reddish ferruginous matter, with fragments of 
shells. 
North Island, one of Sir Edward Pellew’s group. — 
Coarse siliceous sand, concreted by ferruginous matter; 
which, in some places, is in the state of brown hematite. 
Calcareous incrustations^ including fragments of madrepores, 
and of shells, cemented by splintery carbonate of lime. 
Cape-Maria Island, in Limmen’s Bight, was found by 
Mr. Brown to be composed principally of sand-stone. The 
specimens from this place, however, consist of grey splintery 
hornstoney with traces of a slaty structure ; and of yellowish- 
grey flint, approaching to calcedony ; with a coarse variety 
of cacholong, containing small nests of quartz crystals. 
Groote Eylanbt is composed of sand-stone, of which two 
different varieties occur among the specimens. A quartzose 
reddish sand-stone, of moderately fine grain ; and a coarse 
reddish compound, consisting almost exclusively of worn 
pebbles of quartz, some of which are more than half an 
inch in diameter, with a few rounded pebbles of calce- 
dony. The latter rock is nearly identical with that of 
Simms* Island, near Goulburn’s Island on the north coast. 
Chasm Island, Winchelsea Island, and Burney’s Island, 
are of the same materials as Groote Eylandt: and sand- 
stone was found also on the western shore of Blue-Mud Bay. 
On the shore of the mainland, opposite to Groote Ey- 
landt, a little north of latitude 14°, Mr. Brown observed the 
“ common sandy calcareous stone, projecting here and there 
in ragged fragments.” 
