the south-west joined the Burdekin.  The flat was bounded by hills of limestone, cropping out in large blocks, with visible stratification, but without fossils.  Having passed the third creek in the course of this day’s journey, we encamped on the commencement of another basaltic dyke.  The bed of the creek was full of blocks of Sienite, of hornblende Porphyry, of greenish Pegmatite, and of cellular Basalt.  The river here formed a large sheet of water; large masses of a white Sienite protruded out of it, opposite the junction of the creek.  The opposite bank exhibited a very perfect and instructive geological section of variously bent and lifted strata of limestone, which was afterwards found to contain innumerable fossils, particularly corals and a few bivalve shells.  The Rev. W. B. Clarke, of Paramatta, kindly undertook to examine the fossils brought from this locality.  One he determined to be an undescribed species of Cyathophyllum, and has done me the honour to give my name to it [Refer Note 1 at end of chapter].  The others belonged principally to the following genera, viz., Asterias, Caryophyllea, and Madrepora.  The right bank of the river rose into steep cliffs of basalt, under which the clustered fig tree, with its dense foliage, formed a fine shady bower.  The basaltic dyke was about a mile and a half broad, and I followed it about five miles up the river.  Its summit was flat, rough, and rocky; at the distance of four miles from our camp it receded a little from the river, and there limestone was observed, crowded with fossils like that on the opposite side of the river.  Two miles farther, the bed of the river was formed by a felspathic rock, with beautiful dendrites.  A small island, with a chain of lagoons on one side, and with the river on the other, was also composed of this rock, in contact with, and covered by, basalt in several places.  There were small falls and rapids in several parts of the river.  A beaten foot-path of the natives, and many fire-places, showed that this part of it was much frequented by them.  Wallabies were very numerous between the cliffs of the felspathic rock; and the fine fig trees along the banks of the river were covered with ripe fruit.  The river made a wide sweep round the left side of a large limestone hill, whilst a chain of deep basaltic water-holes continued on its right.  The basalt ceased to the westward of the limestone hill, and was succeeded by considerable flats of Ironbark, Moreton Bay ash, and Bloodwood.  The Capparis still exhibited a few showy flowers.  I examined the country thus far on the 12th April, after the camp had been formed; on returning, I took with me a large supply of ripe figs, of which we partook freely, and which caused several of us to suffer severely from indigestion, though we had frequently eaten small quantities of them without inconvenience.