APPENDIX.
No. I.
GEOLOGICAL SPECIMENS FOUND TO THE SOUTH-WEST OF PORT JACKSON.
Considering the nature of the country over which the first expedition travelled, it could hardly have been expected that its geological specimens would be numerous. It will appear, however, from the following list of rocks collected during the second expedition, that the geological formation of the mountains to the S.W. of Port Jackson is as various as that to the N.W. of it is mountainous. The specimens are described not according to their natural order, but in the succession in which they were found, commencing from Yass Plains, and during the subsequent stages of the journey.
Sandstone, Old Red.—Found on various parts of Yass Plains.
Limestone, Transition.—Colour dark grey; composes the bed of the Yass River, and apparently traverses the sandstone formation. Yass Plains lie 170 miles to the S.W. of Sydney.
Sandstone, Old Red.—Again succeeds the limestone, and continues to the N.W. to a considerable distance over a poor and scrubby country, covered for the most part with a dwarf species of Eucalyptus.
Granite.—Colour grey; feldspar, black mica, and quartz: succeeds the sandstone, and continues to the S.W. as far as the Morumbidgee River, over an open forest country broken into hill and dale. It is generally on these granite rocks that the best grazing is found.