. 78

composed of white, thin-bedded earth with a few leaf remains. No. 2
is from the middle bed 12 to 15 feet thick, apparently carrying some clay,
also plant remains, and a few pebbles. Between these two beds is 2 feet of
earth similar to that in No. 1 and 3 inches of impure material. No. 3 1s
from a 15-foot bed at the base, resembling the middle bed but with more
impurities, and is separated from the middle bed by 8 inches of sandstone
and from a 3-foot bed of diatomaceous earth below, by 3 inches of silt.
Included with these analyses, which were made by F. W. Baridon, Mines
Branch, Ottawa, have been placed for comparison an analysis, No. 4, of a
_pure commercial diatomaceous earth from California!, and two partial
analyses of commercial earths, Nos. 5 and 6, from Nova Scotia.2

Table XI.—Analyses of Diatomaceous Earth.

1 2, =) 4 5 6

SiO artes iy caer OG tice cae Fas a PERE 70-20 79-84 76-52 88-78 72-10 81-30

PUTO) 3g Beteewes Bore | Se bby Ge ee Rte pe tae a ee eee 12-60 7-60 8-63 2-68

eOSOla 5 See ee ae ee ee Mies es eS 9 4-56 2-82 3-92

COs er re ng ne he Senet Sa ah ee te 0-81 0-51 0-69 | trace 0-51 0-38

“OO tia S oRates foc! Giri gate aly Gree eS gw pn! Gin Uae ae Weed parang: voce cgay Weg paeece ne 0-10

Oe oe pe ee es oe Fe 0-85 0-50 0-53 1-61

MgO . SE ie tn ah A See a Ree ncse mee rs Are a 1-70 1-00 1-12 1-30

NavO

100) ie 0-60 0-27 0-20

Mit Oy eee gene ey ae Ran trace. | trace. | trace.

FQ above tO5 °C) a5 ae as ee es Ft 7-66 6-22 6-56 5-54 | 10-70 9-34

Carbonateous' matter. es fein yee. ok: , 1-06 1-01 P20 tere 6-30 0-82
' 100-04 99-77 99-37 | 100-01

Loss on dryimerat 105°C. es i 7-97 6-52 cOsS0s tee 6-10 5-16

From the analyses it appears that the middle bed is the purest of the
three. It carries more silica and a smaller percentage of impurities than the :
top and bottom beds; the top bed is the poorest. The large percentage of
iron would cause the material, not any of which is pure white in the un-
burned state, to burn reddish. The composition of the beds at the big
bend to the north may show a somewhat higher percentage of silica, as
indicated by the tests for absorption. ee

The results of tests of the fineness and absorption of the materials
are given in Table XII. Here Nos. 1, 2, 3 represent three beds. referred
to in Table XI. Nos. 4, 5, 6, and 7 refer to deposits occurring along ithe
top of the cliffs at the big bend (Figure 12, localities 1, 2,3). These deposits
lie near together and are numbered from south to north as they occur along
the top of the cliff. Number 4 lies at locality 3 in Figure 12 south of a small
canyon in the face of the cliff (Figure 12, localities 1 and 2). Nos. 5, 6;
and 7 lie north of this canyon. : :

We Se j s
1See Boeck, Op. cit., p. 109. z
*McLeish, J., ‘‘Mineral production of Canada for 1914,” p. 173.