Trachydolerite in Tasmania

In 1889 evidence was laid before this Society by Mr. W. F. Petterd and myself, demonstrating the existence in Tasmania of two centres or districts characterised by eruptive rocks derived from elaeolitic and theralitic magmas. I now submit further localities for rocks belonging to the same great felspathoid series. One of these is the Table Cape Bluff, near Wynyard, on the North-West Coast, and another is the Nut at Circular Head. A third is One Tree Point, Sandy Bay, near Hobart, where melilite, basalt has been identified, but only the first two will be dealt with in these notes

Discovery of an aboriginal chipped flake in deep ground near Gladstone

I happened to be at Gladstone last March when a worked stone of chalcedony was brought to me as a strange specimen found by Mr. Richards in working Richards's and Murray's alluvial tin claim at the old Doone mine, north of the Ringarooma River, and two miles from Gladstone. I recognised it as an aboriginal Flake, but, to make sure, I submitted it to Mr. R. M. Johnston, whose knowledge of these implements is unrivalled, and lie at once pronounced it to be of human workmanship. The following day I proceeded to the claim in order to examine the conditions of occurrence. The actual block of gravel from which the stone had been picked had disappeared in sluicing, but I stood on the actual site of the discovery, and Mr. Richards, who enjoys a high reputation for reliability and integrity, explained to me all the attendant circumstances

On the occurrence of Limurite in Tasmania

This peculiar and interesting rock occurs in considerable quantity at North-east Dundas, on the property held under mineral lease by the Colebrook Prospecting Association (Section 216, 93m). It apparently consists of a huge contact mass, which is of an irregular lenticular form, being bounded on its eastern side by a hard dark-coloured metamorphic slate, probably of silurian age, and on the western side wholly or partially by green serpentine, which is in places much decomposed. Includes photographic plate of Limurite and Axinit

On the topaz quartz porphyey or stanniferous elvan dykes of Mount Bischoff.

This rock was first described by S. N. Wintle in 1875 as eurite porphyry, which it had been termed by Professor G. H. F. Ulrich, who, however, did not publish his description until 1877. In 1875 also the late Chas. Gould wrote as follows : — " Mount Bischoff is a conical eminence rising to about 2,500ft. above the level of the sea. ... It consists of a small protrusion of a porphyritic rock having a felsitic base, with granules and crystals of quartz and felspar ; it weathers white, and is honeycombed or vesicular on the surface, most probably from the decomposition and removal of pyrites, which is freely disseminated throughout in places!." Includes photographic plate

Supplementary note on Limurite in Tasmania

In this paper the authors refer to their note on the same rock presented to the Society last year, since when they have further examined it microscopically, and have studied its occurrence on the spot. They acknowledge their indebtedness to Mr. R. Williams, the Manager of the Colebrook, for many useful and interesting specimens. The mine is between Rosebery and Ringville, on the saddle of a hill about 1500 ft. above sea-level, and is remarkable for the quantity of pyrrhotite occurring in the rock, associated with copper pyrites in relatively small quantities. The authors do not regard the occurrence as a lode, but rather as a rock mass, in the form of an irregular dyke or intrusion

On Hauyne-Trachyte and allied rocks in the districts of Port Cygnet and Oyster Cove

The igneous rock at Port Cygnet, in Southern Tasmania, has been known for a long time by the name of felspar-porphyry. As the porphyritic crystals of felspar are rather strikingly displayed in the rock, specimens have now and again, through collectors, found their way to different parts of the Colony. Microscopical study of some of these samples made us aware that the handsome porphyries were soda-trachytes, and we classed them as such in our last year's sketch of the igneous petrology of Tasmania. Since then we have found the felspathoid mineral haiiyne or nosean in them, which confirms our previous determination, and a recent excursion to the locality has enabled us to recognise quite a group of these rocks, as well as to fix their geological age. Includes illustrations of transverse sections

On the Felsites and associated rocks of Mount Read and vicinity

Associated with the schists of Mount Read and district are some obscure igneous rocks, siliceous in nature, compact in grain, often slightly schistose, which are what the field geologist calls felsites or felstones. These terms, however convenient, need explanation, for in different countries they carry different meanings. In Germany the word felsite (or micro-felsite) is applied to the compact homogeneous-looking groundmass of quartz porphyries

Methodological advances in imaging intravital axonal transport

Axonal transport is the active process whereby neurons transport cargoes such as organelles and proteins anterogradely from the cell body to the axon terminal and retrogradely in the opposite direction. Bi-directional transport in axons is absolutely essential for the functioning and survival of neurons and appears to be negatively impacted by both aging and diseases of the nervous system, such as Alzheimer's disease and amyotrophic lateral sclerosis. The movement of individual cargoes along axons has been studied in vitro in live neurons and tissue explants for a number of years; however, it is currently unclear as to whether these systems faithfully and consistently replicate the in vivo situation. A number of intravital techniques originally developed for studying diverse biological events have recently been adapted to monitor axonal transport in real-time in a range of live organisms and are providing novel insight into this dynamic process. Here, we highlight these methodological advances in intravital imaging of axonal transport, outlining key strengths and limitations while discussing findings, possible improvements, and outstanding questions

Nepheline and Melilite rocks from Shannon Tier

We received recently from the Mines Department some specimens of rocks from the Shannon district, where they had been looked upon as indicating the possible occurence of tin and gold. Mr. George Allison, of Hunterston, kindly supplemented these, and outlined for us their geological occurrence on that estate, and from his descriptions we are able to indicate broadly the features of the locality. The Shannon Tier forms there a high plateau of mesozoic dolerite which rises a thousand feet above the Permo-Carboniferous country at its base. On the slope below the Tier are small rounded or conical hills of a dark grey, slightly bluish, basaltic rock, and at the base of or beneath the flanks of these is a strange-looking coarse zeolitic rock called locally " tourmaline-rock." This is as much as can be stated at present respecting the geology of this rather remote place. The presence of gold is said to have been established in the tourmaline-rock, but an assay by the Government Analyst did not confirm this

On the occurrence of Spherulitic Felsite on the West Coast of Tasmania

Examples of this rock from four different localities have come under our notice, namely, from Zeehan, the Castray River, Trial Harbour, and Strahan, and upon these occurrences we now offer a few observations. Includes photographic plate