I had arrived in a country which I had myself surveyed; and the roads and towns in progress were the first fruits of these labours. I had marked out in 1830 the road now before me, which I then considered the most important in New South Wales as leading to the more temperate south, and I had now completed it as a line of communication between Sydney and the southern coasts. This important public work on which I had bestowed the greatest pains by surveying the whole country between the Wollondilly and Shoalhaven rivers, had been nevertheless retarded nearly two years on the representations of some of the settlers, so that the part most essential to be opened continued still in a half finished state.*
(*Footnote. A petition had been got up in favour of another line said to be more direct; and it is a remarkable fact that numerous signatures were obtained even to such a petition, although it was found at last that the line laid down after a careful survey was not only twelve chains shorter than the other proposed but also avoided the steepest hills.)
SHOALHAVEN RIVER.
The Shoalhaven river flows in a ravine about 1500 feet below the common level of the country between it and the Wollondilly. Precipices consisting at one part of granite and at another of limestone give a peculiar grandeur to the scenery of the Shoalhaven river.
LIMESTONE CAVERNS THERE.
The limestone is of a dark grey colour and contains very imperfect fragments of shells. We find among the features on these lofty riverbanks many remarkable hollows not unaptly termed hoppers by the country people, from the water sinking into them as grain subsides in the hopper of a mill. As each of these hollows terminates in a crevice leading to a cavern in the limestone below, I descended into one in 1828 and penetrated without difficulty to a considerable depth over slimy rocks, but was forced to return because our candles were nearly exhausted. A current of air met us as we descended and it might have come from some crevice probably near the bed of the river. That water sometimes flowed into these caverns was evident from pieces of decayed trees which had been carried downwards by it to a considerable depth. I looked in vain there for fossil bones, but I found projecting from the side of the cavern at the lowest part I reached a very perfect specimen of coral of the genus favosites.
COUNTY OF ST. VINCENT.
The country to the eastward of the Shoalhaven river, that is to say between it and the sea-coast, is very wild and mountainous. The higher part including Currocbilly and the Pigeon house (summits) consists of sandstone passing from a fine to a coarse grain, occasionally containing pebbles of quartz, and in some of the varieties numerous specks of decomposed felspar. The lower parts of the same country, according to the rocks seen in Yalwal creek, consist of granite, basalt, and compact felspar. Nearer the coast a friable whitish sandstone affords but a poor soil, except where the partial occurrence of decomposed laminated felspar and gneiss produced one somewhat better. This country comprises the county of St. Vincent, bounded on one side by the Shoalhaven river and on the other by the sea-coast. The southern portion of that county affords the greatest quantity of soil available either for cultivation or pasture; although around Bateman Bay, which is its limit on the south, much good land cannot be expected as Snapper Island at the entrance consists of grey compact quartz only, with white veins of crystalline quartz.
UPPER SHOALHAVEN.
The country on the upper part of the Shoalhaven river comprises much good land. The river flows there nearly on a level with the surface and resembles an English stream. The temperature at the elevation of about 2000 feet above the sea is so low even in summer that potatoes and gooseberries, for both of which the climate of Sydney is too hot, grow luxuriantly. A rich field for geological research will probably be found in that neighbourhood.