Gregory.] SHERIDAN SANDSTONE. 133 
. 2. Beds a foot or more in thickness, somewhat coarser, but other- 
wise practically as above in general texture. They contain much larger 
and more numerous fragments of slate, and, as has been noticed by 
others, 1 several species of fossils which seem to decay readily and give 
the rock an amygdaloidal aspect. These two varieties are ordinarily 
separated by — 
3. Beds of very fine brown sandstone, one-half inch or more in thick- 
ness, which show mud cracks and appear as fine consolidated beach 
muds. The rocks of this section, particularly of the gray fossiliferous 
beds, are duplicated near the store and church at Frenchville. The 
position of these fine beds on the river is, strike N. 100° E., dip S. < 10°. 
All the beds in this neighborhood have this strike, but the dip rises to 
50°-60°. 
Coarse conglomerate variety. — This is abundantly exposed along the 
State road, where it forms ridgelike hills, which are crossed by the 
road. Massive ledges of it outcrop on the river, and loose bowlders, 
sometimes 20 feet or more in diameter, lie in the stream and along the 
bank. All these conglomerates are practically identical in composition, 
but differ in amount of induration from loose sandstone to very com- 
pact specimens cemented with quartzitic material. Usually the altera- 
tion between coarse and fine strata occurs every few feet, but continu- 
ous layers of conglomerate with a thickness of 10 feet and more were 
observed. 
The pebbles exposed by weathering are at times 6 to 8 inches in their 
longest diameter and are subangular to rounded in form. The peb- 
bles found in these conglomerates are: quartz; granite; red, white, 
and greenish jaspers, .agate, and other siliceous fragments; pieces of 
black slates; sandstones; quartzite; felsitic igneous rock; spherulitic 
andesite; porphyritic and amygdaloidal lavas. Of these components 
the siliceous subvitreous-looking fragments are most abundant and 
durable (see PI. IX, A). 
A thin section examined under the microscope showed the cement to 
be largely of rounded or subangular quartz and feldspar grains, often 
with striking intergrowth. The great variety of fragments of sedi- 
mentary and igneous rocks and of minerals present is unusual. 
CHAPMAN SANDSTONE. 
This sandstone covers a considerable area in Chapman Township 
and was examined at four outcrops: On the main road west of Quoggy 
Joe, on the south branch of the Presque Isle near Tweedy's, in the 
road near the southwest corner of the township, and at Edmunds 1 1 ill. 
The. most interesting occurrence is that on the Presque Isle River, 
and this will be described as representing them all. Here the rocks 
Bailey, Ann. Rept. Geol. Nat. Hist. Survey Canada, 1887-88, I't. M, p. 45. 
