NE Rauðufossafjöll, Torfajökull - a 1235 m high rhyolite tuya emplaced beneath ice >400 m thick. A near-horizontal lava cap is underlain by poorly-exposed fine-grained ash.

This image was provided by Hugh Tuffen, Lancaster University.

Reference

Tuffen H (2001) Subglacial rhyolite volcanism at Torfajökull, Iceland. Unpublished PhD thesis, Open University, UK.