Études sur les glaciers

Louis Agassiz, a Swiss-born naturalist and geologist, revolutionized the understanding of Earth's history with his work on glaciers. In his 1840 publication, Études sur les glaciers ("Studies of Glaciers"), Agassiz presented compelling evidence that vast ice sheets had once covered much of Europe and North America. He proposed that erratic boulders and glacial till found across these continents were direct results of this ancient ice age, challenging prevailing theories that attributed these features to catastrophic floods. Agassiz's research, including extensive fieldwork in the Alps and later in North America, demonstrated that glaciers had been far more extensive in the past than previously believed, fundamentally altering the field of geology.12