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