Arboretum Landscape Teaching Aid Series: A River Emerged From Under A Glacier

Identifier3.19497

TypeDrawing

Date created1940 – 1960

DescriptionPrimarily textual teaching aid depicting Arboretum landscape. This material shows the origin of gravel pits at the Arboretum.

Header: A RIVER EMERGED FROM UNDER A GLACIER

Text and illustrations from top to bottom:

• [Depicted in stylized scroll with illustration of a steam shovel in gravel pit] The Record: There are several old gravel pits in the Arboretum.
• Interpreting the record:
  • 1) A river running under a glacier is confined to a narrow channel, and is, therefore swift. Because of its swiftness it can carry gravel.
  • 2) When such a river comes out from under the ice it spreads out and slows down. Slow moving water can carry only fine material. Therefore the river dropped its heavy material.
  • 3) When men found these places they dug the gravel out.

LanguageEnglish