Glacio-fluvial Depositional Features Explained

Glacio-fluvial features relate to landforms created by meltwater streams flowing from glaciers. Depositional features specifically are landforms built by the accumulation of sediments transported and deposited by these meltwater streams.

Analyzing Landform Features

We need to identify the feature that does NOT fit the description of a glacio-fluvial depositional feature.

• Drumlin: This is a depositional landform made of glacial till (sediment deposited directly by ice). While it's depositional, it's formed by the direct action of glacial ice, not typically by meltwater streams (glacio-fluvial action).
• Esker: This is a long, winding ridge of layered sand and gravel deposited by a meltwater stream flowing within, under, or upon a glacier. It is a classic glacio-fluvial depositional feature.
• Horn: This is a sharp, pointed peak formed by the erosional activity of glaciers, particularly cirque glaciers, eroding a mountain from multiple sides. It is an erosional feature, not a depositional one.
• Kame: This is an irregularly shaped mound or hill composed of sand, gravel, and till that accumulates in a depression on a retreating glacier or between the ice and land. It is formed by meltwater deposition and is considered a glacio-fluvial depositional feature.

Conclusion on Feature Type

Comparing the options:

• Eskers and Kames are formed by meltwater deposition (glacio-fluvial depositional).
• Drumlins are formed by ice deposition (till), making them glacial depositional but not primarily glacio-fluvial depositional.
• Horns are formed by erosion, not deposition, and are shaped by glacial ice, not meltwater streams.

Therefore, the Horn is the feature that is not a glacio-fluvial depositional feature, as it is fundamentally an erosional landform.