Analysis of information sources in references of the Wikipedia article "Landslide" in English language version.
The river became larger and shallower, and the enormous amount of soil carried away (equivalent to natural contributions over a period of 5,000 years) began to settle 4 km upstream from the mouth to the St. Lawrence River.
The country in the vicinity of Sainte-Anne-de-la-Pérade, and stretching east and west of the Sainte-Anne river, is a clay plain, well suited for agriculture.