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sandstone, passes at times into cherty and jaspery and quartzitic facies. 
The same association of siliceous rock and iron ore is found near Pic 
River, near Rainy Lake and on Rainy River, and near Rat Portage. 
Jaspery material like that of Michipicoten is found interbedded with 
iron ores near Lakes Wahnapitae and Temagami, between Sudbury 
and the Ottawa River. ‘‘If, as seems probable, these jaspers are the 
equivalents of the western Huronian sandstones, we have a definite 
horizon, traceable from point to point across the whole northern end 
of the province” which will be ‘fa most valuable thread with which to 
unravel the much disturbed and complicated series of Huronian in 
Ontario.” The conglomerates frequently found near the iron-bearing 
series and containing sandstone, chert, or jasper, identical with those 
of the iron-bearing series, have a similar range from east to west across 
the province and are thought to mark the greatest break in the Huro- 
nian series, or, in other words, to form the basal conglomerate of the 
Upper Huronian. 
The author shows that if these conclusions are well founded we 
have ‘‘a means of correlating the widely separated and very different 
looking rocks mapped as Huronian in Ontario. Applying these con- 
clusions to the Shoal Lake district, a part of Lawson’s Keewatin is 
of Huronian age. They may also lead to a more certain correlation 
of the pre-Cambrian rocks of Ontario and the Wisconsin- Minnesota 
region.” R. D. GEORGE. 
Mesozoic Fossils of the Yellowstone National Park. By YT. W. 
Stanton. An extract from ‘Geology of the Yellowstone 
National Park,’ Monograph XXXII of the U. S. Geological 
Survey, Part II, Chapter XIII. Washington, 1899. 
This chapter forms a valuable contribution to our knowledge of 
the Mesozoic faunas. The collection of invertebrate fossils described 
in it consists of seventy-eight species, having a distribution as follows: 
thirty-one are Cretaceous, forty-six are Jurassic, and one is possibly of 
Triassic age. The last specimen, a species of Lzvguda resembling Z. 
brevirostris of Jurassic age, occurs in the Teton formation which occu- 
pies the stratigraphic position between the known Carboniferous and 
the undoubted Jurassic. This paleontologic evidence is considered 
too slight to form the basis of a correlation of the Teton with the Tri- 
assic of other areas. 
