(Volume 1 page 110.

See also Freycinet page 187.) The cementing limestone in the rock of this island, is very like some of the more compact portions of the stone of Guadaloupe, which contains the human skeletons, the hardness and fracture being nearly the same in both.
The chief difference of these rocks seems to arise from the nature of the cemented substances; which, in the Guadaloupe stone, being themselves calcareous, are incorporated, or melted as it were, into the cement, by insensible gradation;* while the quartzose sand, in that of Dirk Hartog's Island, is strongly contrasted with the calcareous matter that surrounds it.** But, wherever the imbedded fragments in the latter consist of limestone, their union with the cement is complete.
(*Footnote.

See Mr.Koenig's Paper.

Philosophical Transactions volume 104 1814 page 107 etc.) (**Footnote.

Captain King informs me that the soundings in this part of the coast bring up a very fine quartzose-sand like that cemented in the breccia.) ROTTNEST ISLAND, about four hundred and fifty miles south of Dirk Hartog's Island.