146 
Miles and __ the Chazy but contain the fauna which at Lake 
Champlain characterizes the upper division of 
that group. 
10:2 m. Parc Laval.—A low cutting in clayey lime- 
16-4km. stone near this point contains a great number 
of well preserved cystids, and a little search 
in the beds should reveal Malocystites mur- 
chisont and Sigmacystis emmonst. 
13 m. St. Martin Junction.—Quarries situated at 
20:9km. the top of the hill near this point are being 
actively worked, and produce a good building 
stone, but the strata in some of them are not 
very fossiliferous. In other quarries, however, 
where the strata are weathered, the rock is seen to 
be made up of myriads of plates and fragments 
of cystids and crinoids. The following species 
are quite common:—Malocystites murchisont, 
Sigmacystis barrandet, Sigmacystis emmonsti, 
Hebertella borealis, Hebertella swmperator, Bol- 
boporites americanus, Blastoidocrinus carchar- 
adens, Camarotechia orientalis, and Camaro- 
techia plena. This is a modification of the 
fauna of the upper of the three divisions of the 
Chazy on Lake Champlain. 
MILE END. 
The contact of the Lowville and Black River is well 
shown at several points in the old quarry at the corner 
of Christopher Columbus and Bellechasse streets, Mile 
End. Only about one foot of the top of the Lowville is 
exposed, which is a light buff, pure limestone, full of 
Tetradium cellulosum. The lowest bed of the Black River 
is a dirty nodular layer, just above which is a four-inch 
layer, very full of fossils. The whole thickness of the Black 
River here is 12 feet (3-6 m.). The upper layers, as seen 
near Christopher Columbus street, in the middle of the 
block, are full of plates of black chert. The surface of 
this chert-bearing layer shows a number of large speci- 
mens of Hormoceras and Endoceras. 
In the field across Christopher Columbus street, in 
line with the unopened part of Rue de la Roche, the lowest 
beds of the Trenton are exposed. These are thin-bedded 
