SYSTEM OF NORTHERN MAINE. 39 
Tuladie River, not far from its mouth, and again on the shore of Lake Temiscouata, at a 
point nearly opposite the Tuladie, where they are alluded to in the elaborate section of 
this vicinity, given by Sir W. E. Logan, as “the beds of Pointe aux Trembles.” These rocks 
are massive sandstones, of somewhat dioritic aspect and with bands of purple jasper, 
which pass into and include beds of conglomerate, the pebbles and matrix of which are 
both composed of dark grey or purplish-grey porphyritic petrosilex, mingled at times with 
fragments of black slate. Above these. beds on the shores of the lake, but stratigraphic- 
ally beneath them, the rocks next seen are shales and slates, alternating with sandstones, 
in which we have lately obtained fragments of ribbed shells. Similar beds are well 
exposed at the Tuladie Falls, and like the Silurian slates on the shores of the lake, have a 
pretty uniform south-easterly dip of 70°. The next beds north are those of Black and 
Burnt Points (vide Logan’s section), and are again composed of conglomerates and sand- 
stones, but with the former now greatly predominating and having quite a different 
aspect from those of Pointe aux Trembles, being not only very coarse, but of different com- 
position, the pebbles consisting largely of metamorphic rocks, such as quartzite, white 
sandstone, mica schist, etc., mingled with many of limestone. These beds have also a 
south-eastward dip of 50-60°, and a measured thickness of nearly 1000 feet. They are 
further described by Logan as probably belonging to the Quebec group, and as being 
unconformably covered by the limestones of Mount Wissick next to be noticed. 
An interval of about 1500 yards separates Burnt Point from the eminence last named, 
on whose almost precipitous north-western face (attaining an elevation of 550 feet) a most 
remarkable and interesting section of the rocks composing it may be seen. The order 
of succession and the thickness of the beds, as condensed from Logan’s Report, is as 
follows :— 
Fret 
Wihitishim aasive sandstones sms ce tiecee se ennemie ces eee 45 
Grey coarse calcareous conglomerate, with pebbles of limestone and quartz. 20 
Miegistimesicomce sl ed tereresietemeretietstelelsletelsrslels cialare fereyereitelel=fe/e)-falleleiefelsialaratn 5208006 90 
Green sandstone, with conglomerate bands, as above........... ..,....., 20 
Red and green shales, with included fossiliferous limestone .............,. 125 
Grey nodular limestone, abounding in fossils............. SomanNa edo von 50 
Grey hard sandstone, without observed fossils. ......,....,....... Sondooe 10 
Grey fossiliferous and columnar limestone..........,........,.,.......... 20 
Grey arenaceous limestones and sandstones, with fossils, forming the bulk 
of Mount Wissick, and from the height of the latter estimated as 
RENTE Honest) Wlags55 oagobn adodcs. 095000 ser ob dont en pucooN dans 500 
The dip of the above strata is given as NS. 50, E. < 13°, and it is from this low dip 
chiefly, as compared with the high inclination of the beds north and south of the moun- 
tain, that they are regarded as unconformable to the latter, and as being a part of the 
Gaspé limestone series. The strata north of the mountain are grey calcareous sandstones 
and arenaceous limestones, with dark-banded green slates, highly inclined and greatly 
contorted, which are regarded as belonging to the base of the Quebec group, although 
originally classed and mapped as Devonian. 
Reviewing the above, it would appear that, in the view of Logan, the line of separa- 
tion between the Silurian system (Gaspé limestones) and that of the Quebec group is to 
be found at or near Pointe aux Trembles, all the strata north of the latter, except those of 
