The concertina eskers at Eyjabakkajökull are cone shaped zig-zag ridges consisting of dead-ice which is covered by glaciofluvial deposits, principally sub-rounded gravel and sand.
Krákustígsásarnir við Eyjabakkajökul eru gerðir úr dauðískjarna og setþekju sem samanstendur af hálfnúinni möl og sandi.