Le Heron, D.P. and Craig, J. (2008) First-order reconstructions of a Late Ordovician Saharan ice sheet. Journal of the Geological Society, 165 (1).
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Synthesis of outcrop and subsurface sedimentological and geomorphological datasets across North Africa allows a tentative palaeo-glaciological model of the flow dynamics and recessional character of a 440 Ma old (Hirnantian) ice sheet to be proposed. A system of eight cross-shelf trough depocentres is identified from the Late Ordovician of the Sahara region. These are interpreted to have been carved and occupied by ice streams, providing evidence for widespread heterogeneous flow within the ice sheet. During retreat, two key geological features were produced: (1) laterally extensive, sinuous to linear piles of sediment dumped parallel to the ice margin; (2) large meltwater channels (tunnel valleys) cut near the grounding line.
This is a Approved version This version's date is: 1/2008 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/34387d4f-efbb-9f90-56ce-961acbe42d3f/6/
Deposited by Research Information System (atira) on 03-Jul-2014 in Royal Holloway Research Online.Last modified on 03-Jul-2014
The eprint is of the authors' final draft. It may be downloaded for private study or research, and printed out once. Copyright 2008 the Geological Society of London.