240 
Although no phosphatic rocks were met with in the turquoise belt, a 
sample of ironstone, from a few miles further east, yielded 15 per cent, of 
orthophosphoric acid, as shown by the following analysis made bv Mr.. 
P. G t W. Bayly, at the Mines Department Laboratory. 
No. 344. (Qualitative analysis). 
Iron peroxide ... ... ... ... ... FesCU 
Alumina ... ... ... ... ... ALO 3 
Lime ... ... ... ... ... ... CaO 
Magnesia ... ... ... ... ... MgO 
Phosphoric anhydride ... ... ... ... P 2 O 5 
Orthophosphoric acid (calculated from the P 2 O 5 ... H 3 PO 4 
No. 343. • (Assay). 
Pyrites vein occurring in the graphitic slate with the turquoise. 
Gold ... ... (Au) ... (Trace) 
Silver ... ... (Ag) ... 4 dwts. per ton of sample. 
Myrrhee. 
From Edi I proceeded to Ryan’s Creek on the north-eastern extension 
of the turquoise belt in allotment 30, parish of Myrrhee. Here the beds 
in which the turquoise veins occur are geologically similar to those at Edi, 
and exhibit no lithological resemblance to any of the beds associated with 
the Mansfield’ cherts. The turquoise-bearing belt from Edi to Ryan’s 
Creek appears to have an approximate parallelism to the main porphyry 
formation. Sheeny graptolites were again obtained here, and reported on 
by Mr. Hall as follows: — 
“ Nos. 336-343. Turquoise Mine, Ryan’s Creek, Myrrhee.—Specimen 
338 contains examples'of Diplograptus sp., and 339 a Dtndrograptus , but 
the state, of preservation is too poor to allow of closer determination. There 
appear to be indefinite traces of graptolites on the other slabs. The evi¬ 
dence submitted is not sufficient to give the age of the containing rocks. 
The probability is that they are either Upper Ordovician, or else Lower 
Silurian. ’ ’ 
Some other specimens, examined 1 by Mr. Hall in 1898, from Ryan's 
Creek, Myrrhee, were classed as of Upper Ordovician age. There ils no doubt 
that the Edi and Ryan’s Creek beds are of the same geological age, and 
portions of the same turquoise-bearing belt. They are probably much 
younger than the wavellite-bearing chert and phosphate beds at Mansfield. 
... Not determined. 
.. Not determined. 
.. (Trace) 
(Trace) 
... (About 10 %) 
... (About 15%) 
The Tatong Cherts and Jaspers. 
At about one mile, south-west of the Tatong township, and nine miles 
south-west of the Ryan’s Creek turquoise belt, there is an area of highly 
indurated sedimentary bedls, which I examined on my way back from the 
turquoise mines to Benalla. I made notes on outcrops in the following 
three localities : — 
(a) Allotment 74, parish of Rothesay. 
(b) Allotment 23, parish of Moorngag. 
(c) Allotment 46, parish of Moorngag. 
At locality (b) specimens of the various beds were procured, and the 
appended notes made. 
