144 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
In brief, ihvn, the facts about the geoloj^cal structure of the 
rocks around Lake Temisco\iata are these: on the north, is a 
series of highly crumpled unfossiliferous slates, believed to belong 
to the Quebec group, separated by about half a mile from out- 
crops of a fossiliferous series of gently folded Silurian rocks 
farther south, which in their turn appear to be succeeded by 
highly cnnnpled slates, probably of Helderberg age. The as- 
sumption of an unconformity between the rocks of the Quebec 
group (?) and those of the Silurian cannot be substantiated, for 
there is a gap of half a mile between outcrops. Moreover, the 
difference in degree of crumpling cannot be taken as proof of a 
pre-Silurian folding, for the age of the lower slates cannot be shown 
to be Ordovician, and the slates whose age is probably Helder- 
berg are in places no less intensely crumpled than those supposed 
to be Ordovician. 
Lake Metapedia. — Much the same lack of decisive information 
with regard to geological structure is evident in the descriptions 
of the geology of Lake Metapedia as is indicated above for the 
region about Lake Temiscouata. I shall merely refer to the 
writings of competent observers who have worked in this field; 
comment seems to be unnecessary. 
Logan^ concluded that there was an unconformable relation 
between the nearly flat-lying Silurian sandstone on the south- 
west side of the lake and the strata of the "Quebec group" on the 
northeast. These latter are inclined from 30° to 80° and may be 
overturned in places, but nowhere do the two series of rocks 
appear in contact. Ells^ supposed that the rocks of these two 
ages were in an unconformable relation, which may best be seen 
near Sayabec Station. Low^ added nothing to our knowledge of 
the region, although he emphasized the fact that the contacts 
between the rocks on the east of the lake and those on the west 
are always obscured. The relations are more obscure here than 
at Lake Temiscouata and certainly are ineffective in proving late 
Ordovician folding. 
Carleton County. — No man is more entitled to respect for dif- 
'Logan, Sir William. Geology of Canada 1863, p. 414. 
'Ells, R. W. Aim. Rept. Geol. Surv. Canada 1882-83-84, p. 29E, 
JCCC 
3Low, A. P. Ajin. Rept. Geol. Surv. Canada 1882-83-84, p. 19F, 1885. 
