171 
veins to carry graphite on faces and joints for a width of about 15 ft. 
Iron pyrites is also freely seen. Mr. Close has a 5-acre prospecting 
claim, and has applied for a 30-acre lease. 
The graphite occurs in very small percentage of the whole, and the 
deposit gives little promise of becoming of commercial value. 
Some mining is in progress at some of the older fields in Croajingo- 
long. These I did not visit. Between Bendoc and Clarkville I under¬ 
stand that a Bombala company is sinking a shaft to 200 ft. deep on 
the 'New ISTorth Discovery lode, worked by a Ballarat company many 
years ago; and that, about 10 chains distant, the old Victoria shaft is 
being baled out by other owners for the resumption of mining opera¬ 
tions. A small battery is crushing also at Comhienhar. 
[4.5.14.] 
SILURIAN SILICIFIED CORALS AND A POLYZOAN FROM 
RUSHWORTH. 
By Frederick Chapman, A.L.S., F.R.M.S., Palceontologist to the National 
Museum, Melbourne ; Hon. Pal. Geol. Surv., Victoria. 
Introduction. 
The following report is based on a collection of 35 specimens of corals 
and a polyzoan, altered by silicification, which were obtained by Mr. A. M. 
Howitt in September, 1914. They are of especial scientific interest, on account 
of the proof they afford of the occurrence of undoubted Yeringian beds at 
Rush worth. 
Rushworth lies in a north-easterly direction from Heathcote, and is about 
28 miles distant. At the latter locality palaeontological evidence shows 
the sandstone to contain a small fauna comparable elsewhere with the 
Melbournian; and therefore these two localities, Rushworth and Heathcote, 
are probably on different lines of strike. The North Waranga mining division, 
including Rushworth, has been subjected to a peculiar tectonic disturbance, 
which has thrown the folds of Silurian strata almost at right angles to the 
normal strike of the beds to the north and south of that area.^ This 
disturbance has evidently caused the extreme alteration of the strata at 
Rushworth and the neighbouring localities, inducing the silicification and 
auriferous conditions, particularly of the limestone beds. 
This collection, consisting entirely of corals, points to the existence of a 
more or less clear water or limestone phase of the Yeringian sea at Rush- 
worth, although some other fossils, previously recorded, show an intermingling 
of conditions. This locality appears to cover the most northerly point of 
the westward margin of the Yeringian basin, where to the south one meets 
with it again on approximately the same line of strike at Merriang and Glen- 
burnie-road, Whittlesea ; but where, however, the fauna was developed in 
the direction of an argillaceous or mudstone phase, containing trilobites and 
brachiopods, as described by Mr. Jutson and myself.^ Mr. Howitt has shown 
me, in addition to the present collection, an extensive series of large crinoid 
stem joints, collected mainly from intervening argillaceous or mudstone 
beds in the vicinity. 
^ Prog. Rep. No. V., Geol. Surv. Viet., 187S, p. 154. 
* Proc. Roy. Soc. Viet., Vol. XXI. (N.S.), Pt. I. 1908, pp. 211-225. 
