The Edaga Arbi Glacials are a Palaeozoic geological formation in Tigray (northern Ethiopia) and in Eritrea.

The matrix is composed of grey, black and purple clays (locally silt), that contains rock fragments up to 6 metres across.

[1] The name was coined by geologist D.B.Dow and colleagues[2] They referred to the wide outcrops surrounding the town of Idaga Arbi.

The Edaga Arbi Glacials fill the bottom of north-south oriented valleys, that were carved by glaciers, into the Precambrian basement and in Early Palaeozoic sediments.

Generally, the sediments are rich in mud (clay and silt), in contrast to the Enticho Sandstone fluvioglacial deposits.

In other places, the settling in water of suspended fine-grained sediment resulted in massive stratified mudstones.

[5] The deposits are exposed locally as south as Samre and Abergelle, and then further north at the margins of the Dogu’a Tembien massif.