Boulders drifter by ice on shores of the St. Lawrence

This is plate II of Charles Lyell's Principles of Geology, published in 1832. The plate presents a view of the St Lawrence river in Canada, carrying large ice blocks and boulders. Lyell names those drifting ice block 'erratics' and observes them throughout the large rivers of the American continent. He describes how the tributaries of the St. Lawrence contribute those erratics in the spring as the winter ice melts.

The Principles of Geology were published in three volumes between 1830 and 1833.