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CRETACEOUS AND TERTIARY—BOYNE RIVER. "9 
179. The rock is a cream-coloured, or nearly white limestone, 
breaking easily along horizontal planes, parallel to the surfaces of 
the shells of Ostrea and Inoceramus, of which it is in great part 
composed. The Jnocerami are too fragmentary to admit of spe- 
cific identification, and have served as supports for the oysters, which 
still, in many instances, adhere to them. The. oysters, apparently, 
all belong to a single species, and are identical with the Ostrea 
congesta of Conrad, so characteristic of the Niobrara limestones further 
south. - 
180. These larger shells are imbedded in a soft, whitish, earthy 
matrix, which is found, when microscopically examined, to consist almost 
entirely of the more or less perfect remains of Foraminifera, Coccoliths 
and allied organisms ; together with the small irregular prisms arising 
from the disintegration of Inocerami. The Foraminifera represented are : 
Textularia gibbosa D’Orb. Var. globulosa Ehr. Textularia agglutinans 
Var. pygmea D’Orb. Planorbulina globulosa Khr. Planorbulina farcta 
Var. ariminensis D’Orb. Gilobigerine referable to G. cretacea, also 
occur though not abundantly. All these I have also identified in 
specimens of the Niobrara limestone from Eau qui Court in Nebraska. 
The first named species was found by Ehrenberg in the Brighton and 
Gravesend chaik, being one of the commonest forms in the latter. It 
also occurs in the Meudon chalk of France, and is still living in the 
Mediterranean and elsewhere, at depths of from fifty to one hundred 
fathoms. The second textularine form is closely allied to, if not identical 
with, one found in the English chalk, and is common at the present 
day in the North Atlantic and elsewhere; becoming, however, rare 
and small at great depths, and apparently most at home at a depth 
of about ninety fathoms in the latitude of England. Planorbulina 
globulosa is common in the modern ocean, and in the North Atlantic 
is best developed from the shore-line down to fifty or seventy fathoms. 
The specimens from Manitoba resemble those from the greater depths 
in being considerably flattened. The second rotaline form is abundant 
in the English chalk, in that of Méen, Denmark, and doubtless else- 
where ; and is also found in Tertiary and recent deposits. (Plate XVIL., 
Fig. 2, in Appendix.) : 
181. The general facies of the foraminiferal fauna of these Cre- 
taceous rocks of Manitoba, as well as those of like age in Nebraska, 
singularly resembles that of the English chalk. Both abound in 
textularine and rotaline forms of similar types; the more abundant in 

