21. Runoff from the Valparaiso Moraine built outwash ridges of sand leading into the lake. 22. It straddles the north eastern tip of the Flinders Ranges and its outwash plains. 23. However, the stream's lower reaches are on alluvium and Wisconsinan Outwash . 24. Outwash plains and valley trains are usually accompanied by basins known as " kettles ".25. Glacial outwash dominates the extreme southern latitudes. 26. The caldera later filled with water, eventually overflowing to cause a huge outwash flood. 27. Valley trains are long, narrow accumulation of glacial outwash , confined by valley walls. 28. Quaternary glaciation left deposits of stony loam till plus outwash deposits of sand and gravel. 29. It consists of an extensive outwash apron. 30. Other components of the watershed's surficial geology include gravelly till and outwash sediment.
