PUTREFACTION HAD ONLY COMMENCED WHEN FIRST DEPOSITED.

On the other hand it would appear from the position of the teeth in one skull (Figure 4 Plate 48) that they were only falling out from putrefaction at the time the skull was finally deposited in the breccia, and from the nearly natural position of the smaller bones in the foot of a dasyurus (Figure 2 Plate 51) it can scarcely be doubted that this part of the skeleton was imbedded in the cement when the ligaments still bound the bones together.  The united radius and ulna of a kangaroo (Figure 1 Plate 51) are additional evidence of the same kind; and yet if the bones have been so separated and dispersed and broken into minute fragments, as they now appear in this breccia, while they were still bound together by ligaments, it is difficult to imagine how that could take place under any natural process with which we are acquainted.

ACCOMPANYING MARKS OF DISRUPTION.  EARTHY DEPOSITS.

It may however be observed that the breccia is never found below ground without unequivocal proofs in the rocks accompanying it of disruption and subsidence, and that the best specimens of single bones have been found wedged between huge rocks, where the breccia occurs like mortar between them, in situations eight or ten fathoms underground.

THESE PHENOMENA COMPARED WITH OTHER EVIDENCE OF INUNDATION.

That changes have taken place in the relative level of land and sea is evident from the channel of the Glenelg which is worn in the rock to a depth of five fathoms below the sea level.  The sea must have either risen, or the earth must have subsided, since that channel was worn by any current of water for it is now as still as a canal, the tide making a difference of only a few inches.

The features on the shores of Port Jackson extend underwater, preserving the same forms as they have above it; while the bays and coves now subject only to the ebb and flow of a tide present extensive ramifications, and can only be considered the submerged valleys of a surface originally scooped out by erosion at a period when the land stood higher above the sea.

SALT LAKES IN THE INTERIOR.

The hills on the margins of the Australian salt lakes are always on the north-east side, or opposite that of the prevailing south-west winds.  The formation of these hills is probably due to the action of the wind, the growth and decomposition of small shells, the carbonate of lime disengaged by evaporation, and the concretion of calcareous matter and friable tuff so common in these ridges.

In two of the most remarkable, Mitre Lake and Greenhill Lake, a portion of the basin of each, between the hilly curves and the water, was filled by a dark-coloured perfectly level deposit, apparently of vegetable mould.  This being of a quality different from that of the hills, it would appear that any process by which these heights may have originated through the agency of the water adjacent and the wind could not continue after this different formation had accumulated between them.  Accordingly where this dark-coloured deposit is most extensive the curved hill concentric with the outer margin seems less perfect; but whether worn by time or sweeping inundations I cannot pretend to say.