PRE-CAMBRIAN LITERATURE OF NORTH AMERICA 473 
be recognized, as it has been found already, that some masses of 
supposedly pre-Huronian and Sudburian rocks will be identified 
as Huronian sediments intruded by these late pre-Cambrian 
granites and syenites. However, there are surely some areas 
which are not subject to such a revision, in which the reality of the 
pre-Huronian sediments seems to be beyond dispute; so that we 
may bring our ideas of the pre-Cambrian succession of events 
north of Georgian Bay more up to date, as follows (the events 
being listed in chronological order from the bottom up): 
SEQUENCE OF PRE-CAMBRIAN EVENTS IN THE TIMISKAMING REGION 
Proterozoic Era 
Intrusions of Killarney and Geneva granites and syenites, accompanied 
by severe faulting, mountain folding, and extensive warping. 
Injections and extrusions of basic rocks (Keweenawan) 
Deposition of Whitewater series 
Chelmsford sandstone 
Onwatin slate 
Onaping tuff 
Trout Lake conglomerate (not tillite) 
Hiatus, relations unknown 
Deposition of Cobalt series 
White quartzite 
Cherty quartzite 
Lorrain quartzite and conglomerate (not tillite) 
Gowganda formation—including tillites 
Considerable interval of erosion, the resulting sediments being 
unknown 
Deposition of Bruce series 
Serpent quartzite and conglomerate (not tillite) 
Espafiola limestone 
Espanola graywacke 
Bruce limestone 
Bruce conglomerate (probably not tillite) 
Mississagi quartzite and basal conglomerate (not tillite) 
Great interval of erosion, the resulting sediments being unknown 
Archeozoic Eras 
Time of orogenic diastrophism accompanied by acid intrusions (Algoman) 
Deposition of pre-Huronian sediments (Sudburian and others), quartzites, 
graywackes, conglomerates 
