32
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Formation :
Era Period or Epoch and ao Lithology
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Erosion interval

Pre-Lower Jurassic | | Feldspar porphyry

Paleozoic (?) and Relations of ultramafic intrusions to Takla group and to pre-Lower
Mesozoic Jurassic feldspar porphyry not known

Post-Middle Trembleur Peridotite, dunite,
Permian, pre- intrusions ? pyroxenite, serpen-
Upper Triassic (?) tinite; minor horn-

blendite and related
rocks

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Intrusive contact

] .
Limestone; minor
argillite, chert,
andesite

Pennsylvanian (?) Cache Creek group | Argillite, slate, ribbon
and Permian -+10,000 chert, greenstone;
minor tuff, lime-

stone

Andesitic and basaltic
flows, tuffs, breccias,
agglomerate; minor
argillite, slate,
chert, limestone

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Fault contact; Cache Creek growp and post-Lower Cambrian
rocks may be in part of same age

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Post-Lower Tuff, andesitic and

Cambrian; includes} +17,000 basaltic flows; ag-

beds of late glomerate, grey-

Mississippian age wacke; sandstone,

grit, conglomerate,

Paleozoic limestone, chert,

slate, argillite

Unconformity and erosion interval

Post-Lower Part of Granodiorite, leuco-
Cambrian, pre- Wolverine complex} granite, alaskite,
Mississippian pegmatite, aplite