(**Footnote. Ann. of Phil. June 1824. I am informed that Mr. Von Buch also has published a paper on the rocks of New Holland; but have not been so fortunate as to meet with it.
Since this paper has been at the press, a Report presented to the Academy of Sciences at Paris, on the Voyage of Discovery of M. Duperrey, performed during the years 1822 to 1825, has been published; from whence I have subjoined an extract, in order to complete the catalogue of the rocks of Australia, according to the present state of our information.
Les echantillons recueillis tant dans les contrees voisines du Port Jackson, que dans les Montagnes-Bleues, augmentent beaucoup nos connoissances sur ces parties de la Nouvelle Hollande. Les echantillons, au nombre de soixante-dix, nous offrent, 1. Les granites, les syenites-quartziferes, et les pegmatites (granites graphiques) qui cunstituent le second plan des Muntagnes-Bleues. 2. Les gres ferrugineux, et renfermant d'abondantes paillettes de fer oligiste, qui couvrent non seulement une vaste etendue de pays pres des cotes, mais encore le premier plan des Montagnes-Bleues; et 3. Le lignite stratiforme qu'on exploite au Mont-Yorck, a 1000 pieds au-dessus du niveau de la mer, et dont la presence ajoute aux motifs qui portent a penser que les gres ferrugineux de ces contrees appartiennent au systeme des terrains tertiaires.
Vingt-sept echantillons ramasses a la terre de Van Diemen, dans les environs du port Dalrymple, et pres du Cap Barren, indiquent, 1. Des terrains de pegmatite, et de serpentine. 2. Des terrains intermediaires coquilliers, formes du grauwacke-schistoide, et de pierre calcaire. 3. Des terrains tres-recens, composes d'argile sablonneuse et ferrugineuse, avec geodes de fer hydrate, et du bois fossile, a differens etats. On distingue en outre des belles topazes blanches ou bleuatres, parmi les galets quartzeux, qui ont ete recueillis au Cap Barren: Bulletin des Sciences Naturelles, Octobre 1825 page 189.)
2. The specimens of Captain King's and Mr. Brown's collections, without any exception, agree with those of the same denominations from other parts of the world; and the resemblance is, in some instances, very remarkable: The sandstones of the west and north-west of New Holland are so like those of the west of England, and of Wales, that the specimens from the two countries can scarcely be distinguished from each other; the arenaceous cement in the calcareous breccia of the west coast is precisely the same with that of Sicily; and the jasper, chalcedony, and green quartz approaching to heliotrope, from the entrance of Prince Regent's River, resemble those of the Tyrol, both in their characters and association. The Epidote of Port Warrender and Careening Bay, affords an additional proof of the general distribution of that mineral; which, though perhaps it may not constitute large masses, seems to be of more frequent occurrence as a component of rocks than has hitherto been supposed.* The mineral itself, both crystallized and compact, the latter in the form of veins traversing sienitic rocks, occurs, in Mr. Greenough's cabinet alone, from Malvern, North Wales, Ireland, France, and Upper Saxony. Mr. Koenig has found it extensively in the sienitic tract of Jersey;** where blocks of a pudding-stone, bearing some resemblance to the green breccia of Egypt, were found to be composed of compact epidote, including very large pebbles of a porphyritic rock, which itself contains a considerable proportion of this substance. And Mr. Greenough has recently received, among specimens sent home by Mr. J. Burton, junior, a mass of compact epidote, with quartz and felspar, from Dokhan, in the desert between the Red Sea and the Nile. When New Holland is added to these localities, it will appear that few minerals are more widely diffused.
(*Footnote. See Cleaveland's Mineralogy 1816 page 297 to 300.)
(**Footnote. Plee's Account of Jersey quarto Southampton 1817 page 231 to 276.)
3. The unpublished sketches, by Captain King and Mr. Roe, of the hills in sight during the progress of the survey of the Coasts of Australia, accord in a very striking manner with the geological character of the shore. Those from the east coast, where the rocks are primitive, representing strongly marked and irregular outlines of lofty mountains, and frequently, in the nearer ground, masses of strata highly inclined. The outlines on the contrary, on the north, north-west, and western shores, are most commonly uniform, rectilinear, the summits flat, and diversified only by occasional detached and conical peaks, none of which are very lofty.
4. No information has yet been obtained, from any of the collections, respecting the diluvial deposits of Australia: a class of phenomena which is of the highest interest, in an island of such vast extent, so very remote in situation, and of which the existing animals are so different from those of other parts of the globe. It is remarkable, also, that no limestone is among the specimens from the northern and western shores, except that of the recent breccia; and although negative conclusions are hazardous, it would seem probable, from this circumstance, that limestone cannot be very abundant or conspicuous at the places visited. No eruptive mountains, nor any traces of recent volcanic eruption, have yet been observed in any part of Australia.
5. The recent calcareous breccia, of which a detailed description will be found in the subjoined list of specimens, is one of the most remarkable productions of New Holland: It was found, during the expedition of Commodore Baudin, to exist throughout a space of no less than twenty-five degrees of latitude, and an equal extent of longitude, on the southern, west, and north-west coasts;* and from Mr. Brown's specimens it appears to occur also on the shores of the Gulf of Carpentaria. The full account which M. Peron has given of this formation, sufficiently shows its resemblance to the very recent limestone, full of marine shells, which abounds on the shores of the Mediterranean, the West India Islands, and in several other parts of the world: And it is a point of the greatest interest in geology, to determine, whether any distinct line can really be drawn, between those concretions, unquestionably of modern formation, which occur immediately upon the shore; and other calcareous accumulations, very nearly resembling them, if not identical, both in the fossils they contain, and in the characters of the cementing substances, that are found in several countries, at considerable heights above the sea.
(*Footnote. Voyage 2 page 168, 169 to 216 etc.)
Dr. Buckland has described a breccia of modern formation, which occurs upon the shore at Madagascar, and consists of a firmly-compacted cream-coloured stone, composed of granular fragments of shells, agglutinated by a calcareous cement.* The stone of Guadaloupe, containing the human skeletons, is likewise of the same nature; and its very recent production cannot be doubted, since it contains fragments of stone axes, and of pottery.** The cemented shells of Bermuda, described by Captain Vetch,*** which pass gradually into a compact limestone, differ only in colour from the Guadaloupe stone; and agree with it, and with the calcareous breccia of Dirk Hartog's Island, in the gradual melting down of the cement into the included portions, which is one of the most remarkable features of that rock.**** A calcareous compound, apparently of the same kind, has been recently mentioned, as of daily production in Anastasia Island, on the coast of East Florida;***** and will probably be found to be of very general occurrence in that quarter of the globe. And Captain Beaufort's account of the process by which the gravelly beach is cemented into stone, at Selinti, and several other places on the coast of Karamania, on the north-east of the Mediterranean,****** accords with M. Peron's description of the progress from the loose and moveable sands of the dunes to solid masses of rock.******* In the island of Rhodes, also, there are hills of pudding-stone, of the same character, considerably elevated above the sea. And Captain W.H. Smyth, the author of Travels in Sicily, and of the Survey of the Mediterranean recently published by the Admiralty, informs me, that he has seen these concretions in Calabria, and on the coasts of the Adriatic; but still more remarkably in the narrow strip of recent land (called the Placca) which connects Leucadia, one of the Ionian Islands, with the continent, and so much resembles a work of art, that it has been considered as a Roman fabric. The stone composing this isthmus is so compact, that the best mill-stones in the Ionian Islands are made from it; but it is in fact nothing more than gravel and sand cemented by calcareous matter, the accretion of which is supposed to be rapidly advancing at the present day.
(*Footnote. Geological Transactions volume 5 page 479.)