46

Thickness
Feet
Quartz-mica schist, orange-brown, grain size varies from 0-5 to 5 mm., with
biotite in most places constituting about half the rock, and the remainder
composed of various proportions of muscovite and quartz, with minor
chlorite, feldspar, and garnet; minor quartzite, medium-grained, micaceous,

in uniform beds 1 inch to 1 foot UNO Sa5 go0gcc06a0- Soccuce0% cebodnscoos 1,220
Quartzite, golden to toffee-coloured; interbedded quartz-biotite schist, orange-
brown, coarse-grained (2 to 5 mm.), crumpled ................-.eeeeeeee 270

2-5 mm. comprise up to 5 per cent of some beds .................0-e000- 1,160

feldsparyschist, ssilver-crey,aspeckledane sateen eet eee eerie 600
Quartzite, light grey, massive to slightly schistose ...............-- do 6008 0 240
Quartzite, light grey, moderately fine-grained; interbedded quartz-mica schist,

rin) Jorsrols) TL sWovoyy Uy IMD) stat WC soo noadsdasoncoducesusscdnccs. sey esoscasoc 320
Quartzite, light grey, white weathering, massive to schistose, slightly felds-

pathic, coarsely bedded; thin partings of quartz-mica schist .............. 1,320
Breccia, composed of fragments of white quartzite in a fine-grained, ‘pasty’,

MICACeOUS WMMatrixy clon. Naser he ee eee 60

SI] SDS Ete. Sate ccs Cea ee epee a I pGodooueCUOGeDeD Sed 580
Quartzite, light grey to buff, slightly rusty, in part gneissic and schistose,

mediumgto) coarsely bedded gas ether et eee ee ee 840

Approximate stotalathickness sss leeree see cecicee en enieeeeee tern 13,500

Generalized Section in the Ingenika Range

In the following generalized stratigraphic section of the Tenakihi
group exposed in the Ingenika Range between Mount Lay and Orion
Creek, the thicknesses given are only approximate; they have been scaled
from plotted structures on maps, not measured in the field:

Overlain by Ingenika group (See section page 77)

Top of Section Thickness
Feet

fine-erainedesnain wibel yaawinin ic] eC ieee enn one nen es nie ns 500
Muscovite-quartz schist, porphyroblastic, with garnet and biotite porphyro-

blasts; minor quartzite, slightly micaceous, in beds up to 20 feet thick .... 200
Quartzite, buff-coloured, medium-grained, slightly micaceous; this entire unit

Seems LOMbewa single bed maar are ce ere Pete eee eet arne ne ne aanes 200

it constitutes about one-quarter of the rock volme ...........0...--s 000s 1,200

coloured in beds?2)to Ubifeet thickes a) en nese neat enn nen 800