Figure 21.18Ice-laid and water-laid glacial deposits. Drumlins, found in Patagonia, Argentina. [© Hauke Steinberg.] Kettle lake, northern Minnesota. [Carlyn Iverson/Getty Images, Inc.] Pleistocene varved clay, from an excavation in Stockholm, Sweden. The light layers are the coarse sediments deposited in a lake during warm seasons. The dark layers are the fine clays deposited when the lake was frozen in winter. [University of Washington Libraries, Special Collections, John Shelton Collection, KC4536.] Esker, near Whitefish Lake, Northwest Territories, Canada.