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This was the first indication of reptile life so early as the time of the coal-formation; but as the fossil remains of a reptile have now been found in Old Red Sandstone, at Elgin, in Scotland, the original importance of the discovery in this respect may be regarded as lessened.
Grey only laughed. Some day, she thought, when her father had completed his survey of the coal-formation, and Joseph had induced Congress to stop the war, people would appreciate them. So she took off Mrs. Sheppard's furs and bonnet, and smoothed the two black shiny puffs of hair, passing her husband with only a smile, as a stranger was there, but his dressing-gown and slippers waited by the fire.
He shortly found that it belonged to the upper part of the coal-formation, and hence he designated it carboniferous ironstone. He prosecuted his researches, and found various rich beds of the mineral distributed throughout the western counties of Scotland. On analysis, it was found to contain a little over 50 per cent. of protoxide of iron.
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