How did glacial outwash carve the Jabal Sarah paleovalley in Saudi Arabia?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Silurian paleogeography — Silurian Period Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the middle part of the Silurian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.

The Jabal Sarah paleovalley in Saudi Arabia was formed through intense erosion by glacial outwash streams near the margin of the Gondwanan ice sheet during the late Ordovician period. These streams carved deeply into Ordovician shales, reaching depths of up to 275 metres (900 feet).1

This significant erosion was driven by a combination of factors related to the glacial event, including ice loading and isostatic rebound that occurred during the melting phase near the end of the glaciation. The resulting paleovalleys in the Middle East exhibit much greater topographic relief than similar features found on the Laurentian and Baltica platforms, which were located further from the ice cap.1