I. Original Huronian 
II. Sudbury 
III. Cobalt 
Pleistocene. 
Unconformity. 
Palseozoic. 
Unconformity. 
Olivine diabase dykes. 
Diabase sills and dykes. 
Upper _ 
Huronian 
White quartzite, and yel- 
low chert and limestone ( ?) 
Banded cherty quartzite. 
Lorrain quartzite. 
Slate conglomerate. 
Aberdeen quartzite. 
“ conglomerate. 
Unconformity. 
Lower 
Huronian 
Serpent conglomerate. 
Espanola limestone. 
“ greywacke. 
Bruce limestone. 
Bruce conglomerate. 
^Mississagi quartzite. 
Great unconformity. 
Ki Harney granite-gneiss. 
Intrusive contact. 
Quartzite, slate, and conglomerate. 
Thessalon schists. 
Pleistocene. 
Latest granite dykes. 
Olivine-diabase dykes. 
Keweenawan-I Granite. 
Sudbury nickel-bearing 
eruptive. 
( Chelmsford sandstone. 
Onwatin slate. 
Onaping tuff. 
Trout Lake conglomerate. 
Huronian < Ramsay Lake conglomerate. 
.Laurentian granitoid gneiss. 
Sudbury 
series 
Granite 
[Acid and basic intrusives. 
j Copper Cliff arkose. 
^McKim greywacke. 
^Pebbles in 
Copper Cliff 
arkose. 
Lower Huronian (Keewatin). 
Pleistocene. 
Silurian (Niagara). 
Nipissing diabase. 
Cobalt series 
(including Lorrain 
quartzite). 
Unconformity and erosion. 
Lorrain granite. 
Intrusive contact. 
Timiskaming series. 
Unconformity and erosion. 
f Greenstone, 
Keewatin. jporphyrite, 
[ etc. 
IV. Timiskaming region 
Nipissing diabase, 
Sudbury norite, etc. 
Intrusive contact. 
Whitewater series. 
Cobalt series. 
Huronian . 
Unconformity. 
Bruce series. 
Great unconformity. 
Batholithic granite in- 
trusives. 
Intrusive contact. 
Sudbury series. 
Timiskaming series. 
Fabre series, etc. 
[pre-Huronian 
Unconformity. 
Granite intrusives. 
Keewatin group. 
