77

Thickness
Feet
Schist, grey-green, medium-grained, containing grains up to 7g inch of
transparent quartz, light grey feldspar, and amphibole partly con-

verted to chlorite, in a quartz-sericite-chlorite matrix ........... 150
Unexposed; float principally quartz-sericite schist .................. +200
‘Augen’ quartzite, grey-green, fine-grained, with quartz ‘eyes’ up to

zo inch in diameter in a schistose quartz-sericite-chlorite matrix;

_minor quartz-sericite-chlorite schist, medium- to fine-grained .... 300
Sericite schist, dark grey, fine-grained, finely wrinkled, carbonaceous .. 100
Quartz-sericite-chlorite schist, grey-green, fine-grained; phyllite, dark

silver-grey to black, lustrous, finely wrinkled; minor quartzitic con-

glomerate, sericitic, in beds up to 15 feet thick .................. 600
Quartzitic conglomerate, composed of rounded to semi-angular grains

up to 4 inch in diameter of quartz and perthitic feldspar, with

minor plagioclase feldspar, in a schistose matrix of quartz, mus-

eovite, biotite, and chlorite; about 10 per cent quartz-sericite-

chlorite schist, very. fine-grained ~..-...1...-ccsnccsoceseeseveus 840
‘Augen’ quartzite; interbedded quartz-muscovite-chlorite schist, grey-

green, uniformly fine-grained; about 10 per cent quartzite, medium

coarse, schistose, with scattered flakes of biotite ................- 1,300
Quartzitic conglomerate and ‘augen’ quartzite, containing rounded

and lenticular fragments of feldspar and quartz, most of which

look detrital, but some of which are recrystallized and may repre-

sent porphyroblasts or porphyroclasts, in a light grey-green matrix

consisting of 70 to 90 per cent quartz, 0 to 15 per cent feldspar,

0 to 10 per cent sericitic muscovite and chlorite, and accessory

tourmaline, magnetite, Calcitel. sciyaccs « cje.scvaelscieciockie sci eer 510
Quartzitic conglomerate and quartz-mica schist, in about equal propor-

tions; conglomerate matrix and schist contain 50 to 80 per cent

quartz, 0 to 10 per cent feldspar, 0 to 20 per cent muscovite, 0 to
10 per cent chlorite, and 0 to 5 per cent carbonaceous material;

minor phyllite, black, carbonaceous, in thin bands ..............- 180
Phyllite, black, soft, finely wrinkled, containing about 50 per cent

quartz, up to 10 per cent muscovite, and the remainder obscured

by carbonaceous matter; a few beds are graphitic schists ........ 40
Quartzitic conglomerate, with pebbles of white feldspar (perthite and

albite-oligoclase) up to 4 inch in diameter closely packed in a

slightly schistose matrix containing 80 to 90 per cent quartz, 5 per

cent feldspar, 5 per cent muscovite, minor chlorite, carbonaceous

matter, and calcite, and scattered grains of magnetite up to 7

inch in diameter; minor interbedded quartz-sericite-chlorite schist 190
Quartz-muscovite-chlorite schist, silver-grey-green, with a few beds

containing rudimentary garnet porphyroblasts; interbedded quartz-

sericite schist and phyllite; quartzite, grey-green and brown,

chloritic and sericitic, grading into grit and fine conglomerate, in

beds up to 20 feet thick, with a matrix containing 60 to 90 per cent
quartz, and up to 10 per cent each of feldspar, biotite, muscovite,

PitlidillbysitwesaonoolonsnobodoucopadsuunuodtoumbodpoononucbaGdraas 580
Quartzite and fine conglomerate, light grey, slightly schistose, contain-

ing lenticular fragments of buff and white alkali plagioclase and

purplish transluscent quartz up to 4 inch in diameter in a schist-

ose groundmass containing 85 to 90 per cent quartz, 5 to 10 per

cent feldspar, 2 to 5 per cent muscovite, and minor biotite ...... 100
Base of Ingenika group—lies conformably on Tenakihi group

(See section, page 45).

III. Section in Swannell River Valley West of Orion Creek

Limestone, light grey to buff, fine-grained, crystalline; in part sericitic 60
Slate, pale green, slightly crumpled, chloritic ........ eageuveguceegos 40
Quartzite, light grey, sericitic; minor quartz-chlorite schist ............ 60