168 C. LAPWORTH ON GRAPTOLITES 
ZONE I.—Cape Rosier Zone: Zone of DICTYONEMA SOCIALE and BRYOGRAPTUS. 
The oldest Graptolitic zone represented (as will be seen from the accompanying tables) 
is the Dictyonema sociale zone of Barrasois River (Cape Breton Island) and of Cape Rosier, 
Gaspé. There are very few specific forms occurring in this zone, but they consti- 
tute together a very peculiar and distinct group, totally different from those of the 
remaining zones. The genera include Dictyonema, Bryograptus and Clonograptus, together 
with the dubious genus Staurograptus of Emmons. The Dictyonema appears to me to be 
absolutely identical with one of the forms referred by European (Scandinavian) geologists 
to Dictyonema flabelliforme, Eichwald, which is also, so far as our present evidences enable 
us to judge, identical with Dictyonema sociale, Salter, from the Tremadoc of North Wales. 
To this zone belong the Barrasois River beds, those of Cape Rosier, of Little White 
River, of Grand Méchin Point, of half a mile west of Long Point, Matane, Little Capucin 
River, ete. : 
In Europe, this zone (or zones) occurs in the Tremadoc of Wales and the Tremadoc 
and Ceratopyge beds of Norway (Brégger) and Sweden (Tullberg). It is Upper Cambrian 
(as British geologists receive the term), and is probably represented in the west by a part 
of the Calciferous series of New York and western Canada. It is distinctly older than 
the Graptolitic mass of the Point Levis beds. Not one of its forms has hitherto been 
figured from the Quebec group. It may occur at Point Levis, if the Calciferous is repre- 
sented there. This is a point for future discovery to settle. In the meantime, however, it 
will be better to refer to the zone as the “ Cape Rosier Zone.” Like the Levis Calciferous 
Conglomerate beds, its fauna is made up of genera, partly Cambrian and partly Ordovician 
(i.e. partly Primordial and partly Cambro-Silurian.) 
The Cambrian age of the Dictyonema-bearing Barrasois River beds of Cape Breton 
Island is demonstrated by their included Olenidæ. The Dictyonema beds of Gaspé and 
Méchin cannot be far above this Cape Breton zone. It is exceedingly probable, there- 
fore, that, as in Cape Breton, the Dictyonema beds lie not far removed from the uncon- 
formable base of the fossil-bearing rocks of the district. If so, then the Shickshock meta- 
morphic rocks would come exactly into the place of the Cape Breton “ Pre-Cambrian,” 
while the Acadian, St. John, or Paradoxides-bearing beds of the Lower Cambrian would 
be missing from Gaspé to Quebec, along the south of the St. Lawrence, as they are along 
the north of the St. Lawrence, from Quebec to Lake Superior. 
ZONE II.—Ste. Anne Zone: Zone of PHYLLOGRAPTUS ANNA; Graptolites from Rocks 
three miles above Ste Anne. 
This is clearly the second zone in order of geological antiquity. It is newer than the 
Cape Rosier beds by a well-marked interval, and much older than the Marsouin River 
zone, next to be described. None of its species are common to the other zones, so far as 
known, nor are they known in European equivalents of these zones. The only specimens 
from this special zone in the present collection are from Ste. Anne des Monts (three miles 
above.) The species fairly identifiable include :— 
Tetragraptus bryonides, Hall. Phyllograptus Anna, Hall. 
Œ fruticosus, Hall. Didymograptus extensus, Hall. 
