71

2 feet. Samples of these salts and their source rocks were analysed by
R. J. C. Fabry of the Section of Mineralogy, Geological Survey, who
reported as follows:

“Sample 32R (salt from silver-brown weathered schist).
MgSO, and CaSO, with some water. In acid solution shows some iron.
“Sample 34R (salt from blue-grey phyllitic schist).
Similar to 32R, but calcium is more abundant than magnesium.
“Sample 36R (from exposed points of grey-brown schist).
Mainly basic ferric sulphate.
“Sample 37R (bulk sample, chiefly from rocks similar to spec. 33R). A qualitative
analysis shows this to be a sulphate of magnesium and lime when in aqueous
solution. However, in acid solution iron can also be detected.

A quantitative analysis gave the following results:

Per cent
CaO Serer ee eens bo stot A ee see Real ah 1-78
IME GO) crore alge Gani, Ss ae rare Suir een tals 6-90
Fe20; Spit stn uketei tet ol woes tet wrslisLcbe ls cawedsns so lcus = phone aracis. speReMnioy eaeuene 4-90
SO) ete rcs oe ipa unre ee hea Nt 20-18
SOR ese ree ee ne Mee SEE UNE SORE TE 12-22
TSO] SA Ree aie FR Se eR EE oes ae ees 54-23

99-91”

The source rocks were analysed by Mr. Fabry with the following results
(a composite analysis of ‘average shale’ (“B”’) is included for comparison) :

— 33R 35R Ba
Per cent Per cent Per cent

SSC ON Gree sb SAS cl aR eH ye ra oe ee 59-46 44.45 58-10
J NE CORRS eg a Ieee a me eats Canis ae SrEne c 14-15 30-15 15-40
"De 0 Ss eal aba ith iar tnt amen ermnepenlier ert A er cr 4-44 3-27 4-02
TOG ia Sa tes SMe 3 Ace crab ii Fa Sree Le rae cee 3-58 3-66 2-45
(OPN OI eu eet en rp a ere NC per eee eee eer 0-66 0-42 3-11
1.1 Ua ONCE ar Seta een te ee i aa 3-54 2-98 2-44
PRERROD te cere pene es Sti os UAE SE Sh 5 Ee 2-24 6-12 3-24
PN se ices rioe cite epee et. Se EY a 1-88 1-06 1-30
SO g(a isk IRE e. Der EE eae ae RS 2-37 4-93 _—
FET ROD (yr ernie nes eee re reer SMe a ee Oe 0-38 0-79 5-00
BRO) g soe iaene ee en tth A emia , ee aie aie, 0-68 0-84 0-65
1 OT 0 Raa Saas Mite SO chs cea: hineees 84 ROE tae 0-02 Trace _
TEX OSE E ita Seana aaa RRND Ste tenner gees — _— 0-17
Ort er on Perret ce ne Mra ee cere 6-79 None 2-63
Ogee nes aes SE a 0-26 0-89 0-64
Sh GBR GEOR SS Cote ETERS CIES aime arn er ae a 0-29 0-12 —
Organic = = =
Total 100-74 99-68 _—
Less O/S 0-11 0-04 _—

100-63 99-64 99-95

33R. Grey-brown to silvery, fine-grained, very flaky quartz-sericite schist and
phyllite, in beds about 6 feet thick, separated by bands of micaceous quartzite
up to 12 inches thick. This rock is the source for the salt of sample 32R, and
seems to be representative of the rock type yielding the most copious supply
of salts.

35R. Blue-grey sericitic phyllite, very soft and friable, in beds up to 25 feet thick.
This is the source rock for the salt of sample 34R.

“B”, ‘Average shale’-—composite of many average analyses—F. W. Clarke, U.S.

Geol. Surv., Bull. 770, p. 34.