Journals of Australian Explorations Part 45

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Encamped at 6.0 p.m. The geological structure of this portion of the country is wholly dissimilar to any other part of North Australia we have yet traversed. Granite, porphyry, and slate are the prevailing rocks. The whole appear to have been subjected to considerable disturbance, as the slate is much broken and contorted, and in several parts altered by contact with the porphyry, and no definite strike or dip appeared to exist. The porphyry is of a red-brown colour, consisting of grey paste with crystal of felspar and angular fragments of slate and granite sometimes one foot in length. The granite contains little mica, and the quartz frequently is arranged in rhomboidal crystals nearly parallel to each other; it readily decomposes, and from the predominance of quartz forms a coa.r.s.e gritty soil. Quartz-rock forms large beds and veins in the granite, and has a general trend north and south. It often contains crystals of mica, and therefore not likely to contain metals. In was.h.i.+ng the sand of the river near Camp 83, only a small quant.i.ty of t.i.taniferous iron remained after the removal of the quartz and mica. It was in this locality that the Gilbert Gold Field was afterwards discovered.

Lat.i.tude by e Pegasi 18 degrees 25 minutes 33 seconds.

30th September.

Moved the camp about one mile higher up the river to some small pools of water, and then with Mr. H. Gregory ascended the hills to the south of the camp. From the highest ridge the course of the river was visible for nearly twenty miles, trending first seven miles south-south-west and then south-south-east; at the bend a branch appeared to join from west-south-west, in which direction the country appeared very flat for fifteen or twenty miles, as only a few distant hills were visible; from north round to south-east the country was very broken and hilly, rising highest to the north-east, but the view was limited to eight or ten miles; south-east a valley opened through hills, and more distant ranges were indistinctly seen beyond. The whole aspect of the country was barren, rock forming the princ.i.p.al feature. Returning to the camp, collected a quant.i.ty of the cl.u.s.tered figs on the bank of the creek; this fruit is rather insipid.

1st October.

Steering an average south-south-east course from 7.40 a.m. till 2.40 p.m., camped on the right bank of the river, which first came from south-west and then from south-east, throwing off two branches to the south-west, and was thereby diminished to 100 yards wide at our camp; only one creek and some gullies joined from the east, although the country in that direction was hilly; the bed of the river was still dry and sandy; water very scarce. Slate, quartz, schist, granite, and trap are the princ.i.p.al rocks, and by their decomposition do not produce a soil favourable to vegetation, the country becoming more desolate as we advanced. The only trees which retain their verdure are those which grow on the banks of the river.

Lat.i.tude by a Cygni 18 degrees 40 minutes 29 seconds.

RECONNOITRE TO THE EASTWARD.

2nd October.

The river above the camp coming from the south-south-west, it appeared desirable to pursue a more eastern course, and I therefore started from the camp at 6.30 a.m., accompanied by Mr. H. Gregory, to reconnoitre the country, steering east three miles over low slate hills (the strata dipping 60 degrees to 80 degrees to south by west); ascended a hill from which a range of hills were seen eight to ten miles to the east of a creek rising in them and joining the river near the camp to the east-south-east; at the head of the creek a gap in the hills showed a more distant range of hills; steering in this direction, came to the creek with a sandy and rocky bed ten yards wide and perfectly dry; ascending the range of hills, found them to consist of gneiss, schist, and slate, trap existing on the lower ridges. A large valley extended across our course to the east, beyond which a range of flat-topped hills or tableland bounded the horizon. Descending to the east the country improved and granite const.i.tuted the princ.i.p.al rock, ironbark and a few box-trees forming an open forest which on some of the ridges was well gra.s.sed; the soil a red loam. At 2.0 p.m. came on a small river with a dry sandy bed eighty yards wide; following it down to the south found a small pool of water in a hollow in the sand; here we halted till 3.30, and then followed the river south-west, south-east, south-west, west, and south; at 6.10 ascended a hill on the left hand, from which we saw that the river turned west and north-west, breaking through the hills and joining the Gilbert River. Having ascertained that we were still on a western watercourse, we bivouacked near the river without water.

3rd October.

At daybreak steered north-west, crossing several rocky ridges of hills, and at 2.0 p.m. reached the camp. Nothing of importance had occurred during our absence; the horses had improved by the two days' rest.

4th October.

At 7.15 a.m. left the camp, and, following an average east-south-east course for seven hours, reached the pools found on the 2nd, in the upper branch of the Gilbert River, and encamped. As this route nearly coincided with that on the 2nd, nothing was seen worthy of farther notice.

Lat.i.tude by a Cygni 18 degrees 47 minutes 54 seconds.

5th October.

At 6.45 a.m. left the camp and followed up the river in an east-north-east direction for three miles; water was abundant in the gullies owing to a heavy shower some days previous. Beyond three miles the water ceased and the country was dry and parched. Low hills of schist trap and granite formed a country near the river, and farther back high ranges bounded the valley; they appeared to be flat-topped and with horizontal strata of sandstone on the summits. At noon the river had divided into several small branches, and the character of the country did not promise the existence of water within the s.p.a.ce of a day's journey; we returned down the river to the last water we had seen, and camped about three miles north-east of our last camp. As there was little prospect of finding water again till the range to the east of our present position was crossed, I decided on reconnoitring the country before moving the party farther, and as the weather promised to continue fine, the horse Monkey was shot and skinned preparatory to drying the meat during my absence.

6th October.

At 6.5 a.m. left the camp with Mr. H. Gregory, steering nearly east, crossed the south branch of the river, and reached the base of the higher range at 9.30; here we found a small spring a quarter of a mile south of a remarkable hill formed of a single ma.s.s of bare rock completely honeycombed by the action of the atmosphere; ascended the range, which consisted of porphyry with horizontal sandstone on the summit; we continued our east course over rocky hills with dry watercourses trending north; the gra.s.s was very thin and dry; and the country was openly wooded with acacia, eucalypti, cypress, etc., none of which attained a large size; at 1.30 p.m. halted to rest the horses, and searching among the rocks in the gullies obtained about three quarts of water by digging; at 2.45 resumed our route, traversing a hilly country, and at 4.15 ascended a granite hill with sandstone summit, from which the view was very extensive. Large valleys seemed to join and trend from south to north, and were bounded by ranges, except to the east, where a level plain or wide valley extended to the horizon. In the valley a line of green trees five miles distant marked the course of a creek. Descending the range we encountered a very rocky country with deep gullies, in one of which we found a few gallons of water, which our horses consumed. As there was no gra.s.s here, we pushed on till dusk, and bivouacked in a small patch of gra.s.s by the side of a dry gully. The country east of the range is entirely granitic; gra.s.s very scanty, and very thinly wooded with ironbark.

CROSS A GRANITE RANGE.

7th October.

Continued an east course at 5.50 a.m., and at 7.50 reached the large creek, which was 100 yards wide with shallow sandy bed; the banks low and thinly timbered with ironbark and a few box trees; the soil poor and sandy, producing little gra.s.s. Large casuarina and flooded-gum trees grew in the channel of the creek, which we followed three miles to the north-east without finding any water, and only two spots where it could be procured by digging; we therefore returned up the creek, and dug a well at the most eligible spot, procuring an abundance of good water; at 2.20 p.m. commenced our return route towards the camp, and following up the spurs of the range found a practicable route for the pack-horses; pa.s.sed the highest point of the range at 6.0, and bivouacked at a small dry watercourse at 7.15 p.m.

8th October.

Resumed our route at 6.0 a.m., and deviating to the north of the outward route, found a small pool of water in a rocky gully, and following it down a mile came to a pool of sufficient size to supply the whole party.

At 10.30 reached Bowman's Spring at the foot of the range, and by digging in the moist soil obtained a little water. As we approached the spring a small party of blacks shouted to us from the summit of one of the hills, but did not descend to us, though we halted till 12.30 p.m., and then resumed our route, reaching the camp at 4.0, and found the party all well; the horse-meat quite dry and fit for carriage. Bowman had also replaced the shoes on all the horses. The geological character gradually changes, in consequence of the larger development of the older rocks, as we proceed to the eastward. At the camp gneiss, porphyry, and trap have superseded the slates, and proceeding east, granite is visible at the western base of the range. This is covered by a thick ma.s.s of porphyry, containing large fragments of slate, gneiss and granite in its lower part, and in its upper portion it has a fine grain and light colour.

Being deeply cracked by vertical fissures, it forms vertical columns of rhomboidal form, resembling basalt. The summits of the higher hills are formed by horizontal beds of white sandstone, containing water-worn pebbles of quartz. Granite supersedes the other rocks as the east slope of the range is approached, and is there occasionally intercepted by veins of dark trap.

9th October.

Proposed to start from the camp at the usual time, but four of the horses could not be found, and owing to the rocky nature of the country the tracks were not found till late in the evening, when tracing them some miles I found them at sunset in a secluded valley.

10th October.

This morning we were more successful in collecting the horses, and started from the camp at 6.35 a.m., and steering an easterly course reached the fate of the range at 10.20 and the summit at noon. Following our previous track, reached the pool of water at 1.0 p.m. and camped.

Near the camp the xanthorrhoea first made its appearance.

CROSS THE MAIN DIVIDING RANGE.

11th October.

Leaving the camp at 7.0 a.m., steered an easterly course over somewhat barren granite country, timbered with cypress and ironbark; pa.s.sed close to a hill on the highest point of the range, the summit of which, by approximate measurement, rose to 2500 feet above the sea. Then following a spur of the range we reached the well in the sandy creek at 1.5 p.m.

Having cleared out the sand and banked it up with stakes and brushwood, a plentiful supply of water was obtained at about five feet below the surface of the dry channel.

Lat.i.tude by e Pegasi 18 degrees 45 minutes 53 seconds.

12th October.

At 7.0 a.m. steered north 60 degrees east over undulating granite country, timbered with ironbark and box, the gra.s.s scanty and very dry; at 8.45 crossed a large creek coming from the south. Its channel was 100 yards wide, dry, sandy, and a few pools of shallow water; the banks ten to twenty feet high. Crossing several gullies trending northward, at noon came on a dry sandy creek, also trending to the north. On its right bank was a level flat of cellular lava or basalt. Following the course of the creek, at 1.50 p.m. camped at a fine lagoon a quarter of a mile long and seventy yards wide, the water appearing to be about ten feet deep, although unusually low at the present time. A high range of hills exist to the north of this creek, and the watercourses all trend to the north-west; and, as our lat.i.tude is the same as the Reedy Brook of Leichhardt on the south-west side of the Valley of Lagoons, it is evident that these streams do not join the Burdekin, but are tributary to the Lynd, joining it probably at the southern bend.

Lat.i.tude by b Aurigae 18 degrees 38 minutes 12 seconds.

13th October.

At 6.25 a.m. steered east and traversed a slightly undulating granite country, with small watercourses trending west-south-west. Ironbark and box formed an open forest, the soil poor and gritty, with a few patches of black soil, with blocks of lava on the surface. At 11.15 ascended a small hill of lava, from which the country appeared very level to the east. To the north-east large hills rose about twelve miles distant; ranges also bounded the plain to the south, and some distant summits were visible to the south-east. Continuing an east course, lava became more frequent, and at length covered the whole surface. At 2.30 p.m. came on several streams of lava, forming ridges of rugged rocks, which were crossed with difficulty. These streams of lava appeared to have run from north to south, the thickness twenty to thirty feet, and breadth very variable. The level ground was lightly timbered with ironbark and box. At 5.25 turned to the south-east, following a small gully. Pa.s.sed a small native well; but very little water in it, and the rock prevented it being enlarged. At 6.15 camped near some large rocks, in which five or six gallons of rainwater had collected. Walking down the creek one and a half miles in search of water, found two small pools of rainwater; but the darkness of the night and broken nature of the ground prevented the party moving to them.

14th October.

Moved the camp to the waterholes found last night, one and a half miles down the gully. The country is here granite formation, undulating and moderately gra.s.sed, and wooded with box and ironbark. The day was cloudy, but cleared at night, and I took sights for time, lat.i.tude, and lunar distance. Chronometer 2287 would not wind up in the morning, and stopped during the day, but, having run down, wound again without difficulty.

Longitude by lunar distances 144 degrees 33 minutes 15 seconds; lat.i.tude by e Pegasi 18 degrees 41 minutes 38 seconds; variation of compa.s.s 5 degrees 50 minutes east.

15th October.

Resumed our journey at 7.0 a.m., and followed the course of the creek to the south-east. The north-east side was a plain of lava, and the south-west consisted of granite ridges with sandstone on the summits.

Several small creeks joined from the south-west, and increased the princ.i.p.al channel considerably. At 10.0 the country was more level and openly timbered with box and bloodwood; gra.s.s was abundant and green, owing to heavy rains, which appear to have been accompanied with hail, as the west-north-west sides of the trees were much bruised and the soil indented, and a great portion of the leaves torn from the trees. At 1.15 p.m. camped on a small tributary creek. The country appears to be chiefly granite and mica schist, with thin beds or streams of lava, which have come from the ranges to the north and advanced to various distances into the more level land. The surface of the lava is more thinly wooded and better gra.s.sed than the granite; but the roughness of the surface and scarcity of water rendered it less convenient travelling. From one of the higher ridges we had a wide but imperfect view of the country. The air being hazy, only a few of the marked features of the ranges to the north were visible; to the east a high hill twenty-five miles distant rose beyond an undulating wooded country. At 6.0 a heavy thunderstorm caused the creek to run for several hours.

Lat.i.tude by Capella 18 degrees 49 minutes 13 seconds.

THE BURDEKIN RIVER. A CAMP OF LEICHHARDT'S.

16th October.

The rain having pa.s.sed away, the morning was clear and cool, and at 6.35 a.m. resumed our journey, steering average south-east, crossing the creek several times, and at 11.0 reached the bank of the Burdekin River, which had a strong stream of water flowing in its channel, which is here about 100 yards wide, but full of casuarina and melaleuca trees; the banks steep and cut with deep gullies. Following the river to the south-east, at 2.0 p.m. camped in a large open gra.s.sy flat a mile from the river, obtaining water from a small pool filled by the rain last night.

Lat.i.tude by e Pegasi 18 degrees 57 minutes 48 seconds; variation of compa.s.s 5 degrees east.

17th October.

Journals of Australian Explorations Part 45

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