Synchroni)im of the Lake Superior Region. — WiiichelJ. 207 
ParalleUsui betireen the Eas 
Super tor 
Lake Superior. 
(a). Upper Cambrian (Dicello- 
cephalus) fauna, embraced in mag- 
nesian limestones and siliceous 
sandstones. 
(b). The upper jjarts of (a) non- 
conformable on some of the earlier 
rocks, indicating a progressive 
submergence. Contact on the 
trap at St. Croix falls. St. Croix. 
(c). The base of (a) is a sand- 
stone, and a conglomerate and is 
non-conformable on the rocks of ie) 
and of (g), and the sandstones also 
on some j^arts of (d). Lake Supe- 
rior sandstone. 
(d). Basic irrviptives and surface 
flows, accompanied by acid igne- 
ous rocks; these interstratified 
with clastic rocks. Keweenawau . 
(e). Underlying the eruptives of 
(d) is a great quartzyte and con- 
glomerate, very compact and firm. 
The Sioux quartzyte containing 
Paradoxkles and Liugnla. This 
is non-conformable on all the older 
rocks. In Wisconsin F^akeaenuvat 
irvingi is evidently from this hori- 
zon. 
(/). Massive basic irruptives; 
acid eruptives; titanic iron ore; 
anorthosytes, associated with the 
rocks of ig) which they change to 
crystalline conditions. The Ani- 
inikie revolution. 
(g). Slates, limestone, quartz- 
schist, hematite iron ore, upheaved 
and crystallized; mica schists and 
gneisses. The Mesabi and the 
Penokee rocks. The Animikie. 
tern New York and the Lake 
Region.* 
Eastern New Yoi-k. 
(a). Upper Cambrian fauna em- 
braced in magnesian limestones 
and siliceovis sandstone. 
(/*). The rocks of the Upper Cam- 
brian fauna non-conformable on 
the older rocks — both crystalline 
and uncrystalline. Contact on the 
' 'hypersthene rock. ' ' Caleiferous. 
(c). The basal parts of («) are a 
sandstone and conglomerate, wide- 
ly transgressing the older rocks. 
This sandstone is also non-con- 
formable with parts of (/). Upper 
part of the Potsdam sandstone. 
(d). Not certainly identified, but 
probably in the "eastern town- 
ships" of Canada. Not yet sepa- 
rated froi^i (/). 
(e). A hardened sandstone or 
quartzyte lying, with a basal con- 
glomerate, non-conformable on 
crystalline schists. The true Pots- 
dam sandstone at Potsdam, and 
eastward to the Au Sable gorge. 
Hyolithes, Palceacmcea, Conoeeph- 
alites, Lingtila. 
if). The "hypersthene rock," or 
gabbro, of the Adirondacks with 
its titanic iron ore. The Upjter 
Laurentian of the Adirondaeks, in 
part. 
ig). Mica sch is t s, m a r b 1 e 8, 
quartzyte, magnetic iron ores, 
gneiss. Marbles and quartzytes 
have Olenellus in Vermont. Part 
of the Upper Laurentian of the 
Adirondacks, and the Taeonie of 
Vermont. 
*The Eastern New York region in this connection is supposed to in- 
clude adjacent areas in Canada and New England. 
tin Wisconsin, seven miles west from Merillan. in Jackson county, a^re 
mounds of quartzyte (white and pink) similar to the quartzyte at Bara- 
boo, except they are not so dark, from which this fossil evidently was 
obtained. Geol. Wis., vol. iv, p. 173. 
