239 
REPORT ON THE EDI-MYRRHEE TURQUOISE BELT AND 
THE CHERT AND JASPER BEDS NEAR TATONG, COUNTY 
OF DELATITE, WITH PLAN (PLATE XXIV.). 
By A. M . Howitt. 
This geological report has been made on a cursory examination of the 
turquoise belt in two localities, Edi and Mvrrhee, which was made to 
determine whether the turquoise occurred in beds geologically similar to 
the Mansfield chert and phosphatic beds. A sketch geological report on 
some sedimentary beds near Tatong, in the parish of Moorngag, county of 
Delatite, is also furnished. 
On the accompanying sketch geological plan of portion of the county 
of Delatite between the Broken and King Rivers there are shown: — 
(1) The Edi-Myrrhee turquoise belt. 
(2) The chert and jasper beds near Tatong. 
(3) The approximate boundaries of the surrounding geological 
formations, taken from rapid sketch work done by Messrs. 
Ferguson, Allan, and myself for the new geological map of 
Victoria, recently published. 
The Edi-Myrrhee Turquoise Belt. 
Edi. 
An examination of the sedimentary beds of the turquoise belt and 
adjacent country shows that there are no 1 beds geologically similar to' the 
Mansfield chert beds, those noted being :— 
(a) Black graphitic slates, occasionally containing pyrites, either as 
nodules, solid' veins or disseminated crystals. These beds 
are fossiliferous, containing graptolites. 
(b) Narrow beds of grey arenaceous slate. 
(c) Crushed brown and grey slates. 
(d) Brown siliceous sandstones. 
The turquoise veins occur only in the beds, ( a) and (b), which are 
crushed in places. The average strike is N. 35 deg. W., and the dip to 
N.E. at an angle of 80 deg. The turquoise veins, some of which are J inch 
in thickness, run irregularly with the strike, sometimes crossing the beds, 
and are more recent than the quartz veins and the veins and’ nodules of 
pyrites, as is seen in a specimen which shows a nodule 1 inch in diameter, 
bisected by a fault, on the plane of which a turquoise vein has formed. 
Fossils. 
From the black graphitic slate beds faint sheeny graptolites, visible 
only in a certain suitable light, were obtained. These have been examined 
and reported upon by Mr. T. S. Hall, M.A., as follows : — 
“ Specimens 344-365, Turquoise mine, Mount Avis, Edi.—Nos. 344, 
345, 347 and 350 are, I think, branches of a member of the family 
Dichograptidce , perhaps Didymograptus. They do not, I think, belong 
to the family generally known as Leptograptidce nor to the M onograptidce. 
They are, however, extremely indistinct. Numbers 346, 353, 356, 358, 
360, 361 and 362 are indistinct Diplograptidce of indeterminate 
character; while Nos. 348, 351, 354, 363 and 365 are referable to 
Diplograptus itself, and 349. 353 > 357 and 364 are Climacograpti. A 
second specimen of 351 is a Glossograptus. I doubt if 359 is organic.. In 
no case can specific determination be suggested 1 . If the generic, determina¬ 
tions of Didymograptus and 1 Glossograptus be correct, and they seem to be, 
then the age of the beds may be put down as Upper Ordovician.” 
