Search

Search Results

• 1. [Image] Terminal Moraines

  	Image Description from historic lecture booklet: "The thick drift accumulated beneath the end of a valley glacier, or beneath the edge of an ice sheet, is a terminal moraine. At each halt of the receding ...
  	Citation × Citation Citation Abstract Copy Title: Terminal Moraines Year: 1915 Image Description from historic lecture booklet: "The thick drift accumulated beneath the end of a valley glacier, or beneath the edge of an ice sheet, is a terminal moraine. At each halt of the receding ice sheet a terminal moraine was built with lobes extending down the valleys. These moraines are low, hummocky hills, with enclosed basins, or kettles often occupied by ponds. We have seen these proofs of the great ice sheet of North America that developed during the glacial period. Let us now look at some of the glaciers of the present time." Title: Terminal Moraines Year: 1915 Image Description from historic lecture booklet: "The thick drift accumulated beneath the end of a valley glacier, or beneath the edge of an ice sheet, is a terminal moraine. At each halt of the receding ice sheet a terminal moraine was built with lobes extending down the valleys. These moraines are low, hummocky hills, with enclosed basins, or kettles often occupied by ponds. We have seen these proofs of the great ice sheet of North America that developed during the glacial period. Let us now look at some of the glaciers of the present time." Close

• 2. [Image] Glacial Period

  	Image Description from historic lecture booklet: "The land waste and the land surfaces of the United States often resemble those found in a region of present glaciers. This is so widely true as to show ...
  	Citation × Citation Citation Abstract Copy Title: Glacial Period Year: 1915 Image Description from historic lecture booklet: "The land waste and the land surfaces of the United States often resemble those found in a region of present glaciers. This is so widely true as to show that great glaciers once covered the face of the country. We are now to look at some of the proofs of these earlier glaciers. At the beginning of the period of cold, deep snows gathered and ice was formed on broad uplands of Canada. As the cold increased, the area of ice formation grew larger, and the ice also spread by flowing outward about its edges. The ice centers were not among high mountains, but the ice grew in thickness until, like a mass of pitch it was forced to flow by its own weight. It spread in all directions, and the south edge crept out over what is now the boundary of Canada and invaded the region of the United States. How far it reached can best be understood by studying the map. The line of its extreme limit, which geologists have traced with care, traverses the southern border of New England, crosses New Jersey, Pennsylvania, and southwestern New York, and then follows a crooked course north of Missouri and then runs northwest through Nebraska, the Dakotas and Montana. The ice outline had different forms at different times." Title: Glacial Period Year: 1915 Image Description from historic lecture booklet: "The land waste and the land surfaces of the United States often resemble those found in a region of present glaciers. This is so widely true as to show that great glaciers once covered the face of the country. We are now to look at some of the proofs of these earlier glaciers. At the beginning of the period of cold, deep snows gathered and ice was formed on broad uplands of Canada. As the cold increased, the area of ice formation grew larger, and the ice also spread by flowing outward about its edges. The ice centers were not among high mountains, but the ice grew in thickness until, like a mass of pitch it was forced to flow by its own weight. It spread in all directions, and the south edge crept out over what is now the boundary of Canada and invaded the region of the United States. How far it reached can best be understood by studying the map. The line of its extreme limit, which geologists have traced with care, traverses the southern border of New England, crosses New Jersey, Pennsylvania, and southwestern New York, and then follows a crooked course north of Missouri and then runs northwest through Nebraska, the Dakotas and Montana. The ice outline had different forms at different times." Close