6

examples showed similar changes in the opposite direction and the sugges-
tion is that the sediments came from the southeast. Limestone and limy
beds proved more persistent than beds of clastic sediments.

Farther southeast on the Myrtle claim, the beds are subdivided, in part,
into argillites and dark quartzites. The beds cross the Marie, Martha,
Morning Star, and Evening Star claims but could not be subdivided. The
rocks exposed there are argillite and quartzite and on the Evening Star
there is near the top of the member a bed of limy sediments about 50
feet thick. The beds cross Williams creek at the mouth of Stouts gulch and
consist of interbedded quartzites and argillites with some limestone near
the top of the member. The beds cross the Freegold, Wilkinson, Proserpine,
Proserpine East, Penelope, Warspite, Tipperary, Kitchener, Independence,
and Hard Cash claims, but could be subdivided only in the area between
the Warspite and Hard Cash claims. The rocks consist there of argillaceous
quartzite units separated by grey quartzite units, but the member could
not be separated from very similar underlying sediments of the Lowhee
member.

The rocks of the Rainbow member are sheared to some extent every-
where, but only locally are they severely sheared. The beds dip 10 to 70
degrees northeast and the shearing is practically parallel to the bedding.
In general, argillaceous divisions show greater fissility due to shearing than
quartzite divisions. The limy grey rocks vary considerably in fissility,
some bands are very soft and only slightly fissile and were presumably
limy oozes, other bands are soft and fissile and were originally soft, fine-
grained, clastic sediments. The purer limestone beds are not fissile.

Under the Rainbow member is a series of black argillites called the B.C.
member. The base of the member is not exposed on Island mountain but the
breadth of outcrop there is at least 800 feet. Southeast on Cariboo Gold
Quartz ground this member where exposed in the Lowhee ditch is also 800
feet wide, but farther southeast it narrows and may change gradually to
quartzite. It has not been identified southeast of the B.C. vein on the
Cariboo claim, but may extend as far as the Morning Star claim. The
member consists almost entirely of black argillite and served as a very
useful horizon marker, for it could be traced with assurance from Island
mountain to the Cariboo claim. The rocks are only slightly sheared, perhaps
because compared with the overlying interbedded Rainbow member they
were a thick homogeneous unit. The member is not known to contain
quartz veins of value where it is thick, but where it becomes thinner, as at
the Cariboo claim, it contains well-mineralized veins. Compared with the
Rainbow beds the member contains very few quartz veins.

Under the B.C. member is a series of quartzite and other fine-grained,
grey, clastic sediments named the Lowhee member. This member pinches
out or changes to argillite northwest of the Lowhee ditch and widens to
the southeast until on Lowhee creek it is over 2,000 feet wide. Southeast
of the Morning Star claim it adjoins and merges with the overlying Rain-
bow member and the two extend to Grouse creek where the combined bands
are 3,500 feet wide. The rocks of the Lowhee member are quartzites and
argillaceous quartzites. Argillite and limestone are rare or absent. A thin
bed of coarse, angular, clastic material outcropping on the Mucho Oro
claim may be tuffaceous in origin. The rocks have been sheared to a vary-