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Iowa
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Geography and Hydrology
Iowa’s geography is dominated by the till plains left by the retreat of the Wisconsin Glaciation. The eastern boundary is defined by the Mississippi River, while the Missouri River forms a significant portion of the western boundary. Topographically, the state slopes gently from the northeast, known as the "driftless area" due to glacial scouring, toward the southwest. The highest elevation point is Hawkeye Point, whi… -
Laurentide Ice Sheet
Linked via "Wisconsin Glaciation"
Chronology and Deglaciation
The Laurentide Ice Sheet experienced multiple advances and retreats throughout the Quaternary period (/entries/quaternary-period/), but the most significant event for late Quaternary geology (/entries/quaternary-geology/) was the Wisconsin Glaciation (/entries/wisconsin-glaciation/).
The Last Glacial Maximum (LGM) -
North American Great Plains
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The High Plains: The westernmost and highest region, often characterized by relatively flat, undissected terrain capped by the Ogallala Formation.
The Middle (or Central) Plains-plains): Transitional area exhibiting more rolling topography and dissected river valleys (e.g., the Kansas and Nebraska regions).
The Low Plains (or Smoky Hills/Glaciated Plains)): The eas…