70 G. M. DAWSON ON A NEW SPECIES oF 
ness, however, would appear from the fact that about seventeen 
miles to the north-west they are seen forming a range of mountains, 
which rise to altitudes of over 1500 feet above the level of the neigh- 
bouring valleys, and run from near Kelly’s Lake to Canoe Creek. 
~The physical relations of the beds will, however, be described at 
greater length in the next Report of the Geological Survey. 
Though inclined to correlate these limestone beds, on stratigra- 
phical and lithological evidence, with others from which Carbonife- 
rous forms have been obtained, no fossils more characteristic than 
the joints of Crinoidal columns were for some time found in associ- 
ation with the Foraminifer now described. After some search, how- 
ever, specimens of Musulina were discovered, thus bringing these 
into relation with the MYusulina-bearing limestones found elsewhere 
in the province, and also very widely over the western part of the 
North-American continent. 
Many loose fragments and boulders of Loftusca-limestone were 
also found at “The Fountain,” on the surface of a high terrace, there 
overlooking the Fraser. This place is about nine miles south- 
westward from the nearest of the Marble-Canon exposures ; and the 
“specimens here may have been derived from a distinct outcrop not yet 
discovered. 
In certain beds of the limestones of Marble Cafon, the Loftusia 
occurs almost to the exclusion of other forms, characterizing the 
‘rock, and having been the agent in its production, just as Fusuline 
occur in the best examples of /usulina-limestone or Globigerine in 
the Atlantic ooze. Other beds of a nearly white colour and almost 
porcellanous aspect on fracture—though purely calcareous—are 
found on microscopic examination to consist of the comminuted re- 
mains of smaller Foraminifera, the mass resembling a thoroughly 
hardened chalk. Through these a few more or less perfect Loftusie 
may be scattered. usuline appear to be very scarce in the Marble- 
Canon limestones ; they are much more abundant in those of other 
parts of the country, composed principally of Crinoidal fragments. 
‘They seem to have preferred a bottom composed of the débris of the 
larger calcareous organisms to the fine oozy bed most congenial to 
the Loftusia. 
The typical and most abundant form of Loftusia-limestone is a 
pale or dark grey cryptocrystalline rock, in which the more perfect 
specimens of Loftusia appear thickly crowded together as paler spots, 
generally pretty sharply defined. The limestone breaks freely in any 
direction, the fracture passing equally through the matrix and in- 
cluded erganisms, which it is impossible to separate from the stone. 
The matrix generally seems to be composed in great part of granular 
calcareous matter similar to that employed in building up the test 
of the Loftusia, but more irregular in size of grain, and with an oc- 
casional fragment of a Crinoid or example of some smaller Fora- 
minifer. When a Pusulina is found, even on the same thin section 
with a Loftusia, it differs totally from the latterin appearance. The 
fine tubulation of the walls has not been preserved ; but the calcite 
is homogeneous and almost milky in appearance, while the frag- 
