134 ROYAL SOCIETY OF CANADA 
which are shaly and bituminous, carry a very distinct fauna, of which 
trilobites and graptolites are conspicuous. Until quite recently there 
were but few species of fossils known from this formation in Canada. 
Diligent search in the various outcrops of this formation at Cummings’s 
Bridge, New Edinburgh, along the Rideau River at the old Rideau Rifle 
Range, on Preston street at Rochesterville, at Billings’s Bridge, and on 
the Montreal Road in Gloucester, as well as in numerous excavations for 
building, drainage and waterworks purposes within the city limits have 
yielded upwards of fifty species. 
The graptolites from this formation were forwarded to Prof. Chas. 
Lapworth, of Mason Science College, Birmingham, the leading author- 
ity on these organisms, and he has prepared an interesting series of 
notes bearing upon them which it is hoped will soon be published. 
Several species of the genus T'riarthrus occur in this formation, and 
are eminently characteristic of this horizon. 7°. spinosus, Billings, is 
not known outside of the Ottawa Valley. Asaphus latimarginatus, 
Hall, a species usually referred to A. Canadensis, Chapman, is eminently 
characteristic of the lower portion of the Utica. The mode of occur- 
rence of many of the species and examples of graptolites, as well as of 
the fragments of trilobites, lead one to infer that even in this remote 
period in palæozoic times when the Utica was laid down, there were 
marine currents present indicated by the decided uniform orientation 
of the individuals as they are preserved in the mass on the slabs of shale 
rock, throughout this formation. Both in the Utica measures at Bil- 
lings’s Bridge and in the excavations at the old Rideau Rifle Range, an 
almost due south-west and north-east orientation is recorded, which 
direction appears to correspond generally with the edge or trend of 
the Laurentian and Paleozoic contact. This indicates the fact that 
there existed a definite north-east and south-west marine current hug- 
ging the old Archean shores in Ordovician times in this portion of the 
North American Continent. 
The Lorraine formation.—Overlying the bituminous shales and mud- 
stones of the Utica, there occur in certain portions of the Ottawa dis- 
trict a series of buff weathering, calcareo-argillaceous shales and lime- 
stones oftimes magnesian, which carry a fauna quite distinct in facies 
from the Utica. These forms are eminently characteristic of the Lor- 
raine or as it is often called, “the Hudson River Formation.” The ex- 
act thickness of the shales of this formation have not been definitely 
ascertained, a few feet only being exposed in a small cutting on the C. A. 
Ry. about two miles east of Ottawa. The Lorraine formation, however, 
is probably less than one hundred feet in thickness in the Ottawa 
district. Zygospira Headi, Billings; Ambonychia (Byssonychia) radiata, 

