138 Dr. Fitton on the Geology of Australia. 



porphyritic hornstone, approaching to compact felspar, with 

 imbedded crystals of felspar. 



Cape Grafton, about one hundred and eighty miles west 

 of north from Cape Cleveland. — Close-grained gray and yel- 

 lowish-gray granite, with brown mica. A reddish granitic 

 stone, composed of quartz, felspar, and tourmaline. 



Endeavour River, about one hundred miles west of north 

 from Cape Grafton. — Gray granite of several varieties ; from 

 a peaked hill under Mount Cook and its vicinity. Granular 

 quartz-rock of several varieties : and indistinct specimens of a 

 rock approaching to talc-slate. 



Lizard Island, about fifty miles east of north from Endea- 

 vourRiver. — Gray granite, consisting of brown and white mica, 

 quartz, and a large proportion of felspar somewhat decomposed. 



Clack Island, near Cape Flinders, on the north-west of 

 Cape Melville, about ninety miles north-west of Lizard Island. 

 — Smoke-gray micaceous slaty-clay, much like certain beds of 

 the old red sand-stone, where it graduates into grey wacke. 

 This specimen was taken from an horizontal bed about ten feet 

 in thickness, reposing upon a mass of pudding-stone, which 

 included large pebbles of quartz and jasper; and above it was 

 a mass of sand-stone, more than sixty feet thick. — (Narrative, 

 vol. ii. p. 26.) 



Sunday Island, near Cape Grenville, about one hundred 

 and seventy miles west of north from Cape Melville. — Com- 

 pact felspar, of a flesh-red colour; very nearly resembling that 

 of the Percy Islands, above mentioned. 



Good's Island, one of the Prince of Wales's group, about 

 latitude 10°, thirty-four miles north-west of Cape York. — The 

 specimens, in Mr. Brown's collection from this place, consist of 

 coarse-slaty porphyritic conglomerate, with a base of greenish- 

 gray compact felspar, containing crystals of reddish felspar and 

 quartz. This rock has some resemblance to that of Clack 

 Island above mentioned. 



Sweer's Island, south of Wellesley's group, at the bottom 

 of the Gulf of Carpentaria. — A stalactitic concretion of quart- 

 zose sand, and fine gravel, cemented by reddish carbonate of 

 lime ; apparently of the same nature with the stem-like con- 

 cretions of King George's Sound: (See p. 146). In this spe- 

 cimen the tubular cavity of the stalactite is still open. 



The shore, in various parts of this island, was found to con- 

 sist of red ferruginous matter, {Bog-iron-ore P) sometimes un- 

 mixed, but not unfrequently mingled with a sandy calcareous 

 stone ; and in some places rounded portions of the ferruginous 

 matter were enveloped in a calcareous cement. 



Bentinck 



