Abstract
Erosion surfaces and major palaeosols in Quaternary deposits of the eastern Jifarah Plain, allow subdivision of the sediment sequence into six aggradational units Q1–Q6. Comparison of Quaternary sequences in varying continental facies across northern Libya shows that the erosion surfaces and major palaeosols can be traced throughout the region and that they constitute major correlatable events. Correlation also confirms the presence of a seventh aggradational unit between units Q4 and Q5 in upland areas. The depositional units display an irregular but characteristic geometry which reflects changing basin architecture. In upland regions the deposits are typically linear wadi fill and coalesced fan apron passing out into more sheet-like deposits in lowland regions where valley fills are connected across interfluve areas by sheet-wash colluvial and aeolian deposits. Following overall vertical accretion through sequences Q1 to Q4, a major phase of downcutting and terrace formation commenced with the pre-Q5 erosional surface in the early Holocene. Age of the older units is as yet in doubt but there is evidence to assign unit Q1 to the early Pleistocene, unit Q2 to the late Riss and units Q3 and Q4 to the Wurm.
Published Version
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