Bryan Esterly, CFA leads standards development for the Infrastructure sector at the Sustainability Accounting Standards Board (SASB). His role includes research and collaboration with industry and investors to drive the standardization of financially material sustainability information in corporate reporting.
OUTWASH PLAINS. The large quantities of water that flowed from the melting ice deposited various kinds of materials, the most important of which is called glacial outwash. Outwash plains made up of outwash deposits are characteristically flat and consist of layers of sand and other fine sediments. till plain is composed of unsorted material (till) of all sizes with much clay, an outwash plain is mainly stratified (layered and sorted) gravel and sand. The till plain has a gently undulating to hilly surface; the outwash is flat or very gently undulating where it is a thin veneer on the underlying till.
The Interior plains region of the United States and Canada falls within this area. The Interior Plains were often covered by shallow inland seas. Sediments from the shield and the Rocky Mountains were deposited in these seas over millions of years.Eventually the sediments were compressed by the weight of the layers above into sedimentary rock.his area was originally formed when cratons collided and welded together 1.8â1.9 billion years ago in the Trans-Hudson orogeny during the Paleoproterozoic Era. Precambrian metamorphic and igneous rocks now form the basement of the Interior Plains and make up the stable nucleus of North America.