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APPENDIX. 
No. I. 
GEOLOGICAL SPECIMENS FOUND TO THE 
SOUTH-WEST OF PORT JACKSON. 
Considering the nature of the couutry over which the first ex- 
pedition travelled, it could hardly have been expected that its 
geological specimens would be numerous. It will appear, how- 
ever, from the following listof 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 subse- 
quent stages of the journey. 
Sandstone, Old Red. — Found on various parts of Yass Plains, 
in contact with 
