179 
Prospecting along the line of reef by continuing the adit level will 
either reveal the downward continuation of the shoots of stone proved 
on the surface, or prove them only small areas in which the auriferous 
contents has been concentrated by surface enrichment. 
About a quarter of a mile to the east of this mine the old workings 
of the Independent Company are to be seen. These workings appear to 
have been on a similar class of formation. No yields from this abandoned 
ciaim are available. 
A dray track has been constructed to the Morning Star battery, where 
the trial crushings were put through, and an abundant supply of water 
tor crushing and motive purposes flows within a stone’s throw of the 
mine, while all requisite timber is readily obtainable. 
\Report sent in io.i2.oy.\ 
GEOLOGICAL BOUNDARIES IN THE TYERS RIVER 
DISTRICT. 
By ]. Easton. 
The attached plan (Plate 26) shows the northern boundary of the 
Mesozoic rocks in the locality of the Tyers River. 
The Mesotzoics along this boundary consist of a series of basal con¬ 
glomerates and grits composed of the worn-down fragments of the under¬ 
lying Silurian strata. The conglomerates consist of sandstone, quartz, 
and quartzite shingle ranging up to a foot in length, and are to be seen 
in thick beds and detached boulders in the vallev of Rintoul’s Creek, and 
at the falls of the Tyers River. 
On Rintoul’s Creek, near the contact, the conglomerate beds dip away 
to the southward at a slight angle, and about half-a-mile lower down the 
creek, where a conglomerate bed overlies a finer grit and carbonaceous 
shale, the dip is about S. 10 deg. W. at 20 deg. 
The Silurian strata near this contact, and at some distance from it, 
appear to have a uniform strike of about N. 25 deg. W., and a westerly 
dip of from 70 deg. to 80 deg. 
On the Tyers River I was unable to obtain any reliable information 
as to the strike or dip of the Silurians, as at this point there is an extensive 
belt of rubbly shale through which the river runs for some distance above 
the contact. The Mesozoic conglomerates on the west side of the Tyers 
appeared to be dipping a little to the west of south, at an angle of about 
20 deg. 
In Anderson’s Creek the Silurian strata have a north and south strike, 
and dip to the east at 80 deg., while the Mesozoics near by dip to the 
S.E. at a very low angle. 
The Silurian and Mesozoic formations intervening between these main 
creeks are covered by a capping of Tertiarv rocks, which also overlie 
some old volcanic flows, as shown on the accompanying tracing. 
I did not obtain any evidence tending to show the existence of a fault 
line, and therefore consider that the conglomerates of this contact are 
littoral deposits of Mesozoic age resting on the Silurian. 
[.Report sent in 3.8.03.] 
