 | Geological Survey of Canada - 1876 - 166 pages
...therefore much older than those of Nova Scotia and New Brunswick which are of Lower Carboniferous age. The Onondaga formation, which is extensively developed...Mackinac between Lake Huron and Lake Michigan. It uotonly affords gypsum, but is also the source of valuable brine springs, and includes magnesian limestones... | |
 | Ferdinand Vandeveer Hayden, Alfred Richard Cecil Selwyn - 1883 - 758 pages
...valued at $4 per ton. In 1876 the Ontario gypsum mines were producing about 14,500 tons per annum. The gypsum or " plaster " deposits of Ontario belong...springs, and includes magnesian limestones, which are often suitable for the manufacture of hydraulic cement. The principal gypsum mines worked are along... | |
 | Friedrich von Hellwald - 1883 - 756 pages
...producing about 14,500 tons per annum. The gypsum or " plaster " deposits of Ontario belong to the Onoudaga formation, which is extensively developed in Northern...Lake Huron, a distance of 150 miles, again appearing a: the Straits of Mackinac between Lake Huron and Lake Michigan. It not only affords gypsum, but is... | |
 | Sir Arthur James Richens Trendell - 1886 - 570 pages
...valued at 84 per ton. In 1876 the Ontario gypsum mines were producing about 14,500 tons per annum. The gypsum or " plaster " deposits of Ontario belong...and Lake Michigan. It not only affords gypsum, but it is also the source of valuable brine springs, and includes magnesian limestones, which are often... | |
| |
plaster " deposits of Ontario belong to the Onondaga formation, which is extensively developed in Northern New York, crosses the Niagara River into Canada, and extends north-westward to Lake Huron, a distance of 150 miles, again appearing at the Straits... 