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Updated: October 18, 2026
Mr Redfield, by carefully examining the obliquity of the imprints in the Pompton quarries, ascertained that most of them implied the blowing of a strong westerly wind in the triassic period at that place. A certain class of the impressions at Pompton are thought to be attributable to hail, 'being deeper and much more angular and jagged than the rain-prints, and having the wall at the deeper end more perpendicular, and occasionally overhanging.
At various levels in the coal measures of Nova Scotia, ripple-marked sandstones, and shales with rain-prints, were seen by Dr. Dawson and myself, but still more perfect impressions of rain were discovered by Mr. Brown, near Sydney, in the adjoining island of cape Breton.