The actual prophecy?

I found this during a search for "who first spoke the Seventh Generation precept"? (No, the predominant meaning of Seventh Generation is not "a brand of overpriced toilet paper.") I have not uncovered the name of the Iroquois chief yet and will follow up. But meanwhile found this text of a fuller prophecy that I'd not seen before. One generally finds on Favorite Quote sites only the short bit about keeping the seventh generation in mind when making decisions today:

Mohawk Prophecy of the Seventh Generation.
According to the prophecy of the Seventh Generation, seven generations after contact with the Europeans the Onkwehonwe would see the day when the elm trees would die. The prophecy said that strange animals would be born deformed and without the proper limbs. Huge stone monsters would tear open the face of the earth. The rivers would burn. The air would burn the eyes of man. According to the prophecy of the Seventh Generation, the Onkwehonwe would see the time when the birds would fall from the sky. The fish would die in the water. And man would grow ashamed of the way that he had treated his Mother and Provider, the Earth. Finally, according to this prophecy, after seven generations of living in close contact with the Europeans, the Onkwehonwe would rise up and demand that their rights and stewardship over the Earth be respected and restored. According to the wisdom of this prophecy, men and women would one day turn to the Onkwehonwe for both guidance and direction. It is up to the present generation of youth of the Kanienkehaka to provide leadership and example to all who have failed. The children of the Kanienkehaka are the seventh generation.

I found this at http://www.spiritwheel.com/irqprophery.htm but the page is unsourced. Be forewarned: This page is hard on the eyes.