The eruption history of the region does not end in the Pleistocene. Holocene lava fields surround Vífilsfell. They are eruption products of two volcanic systems, the Hengill system to the northwest and the Brennisteinsfjöll system. The last eruptions in the Hengill system took place about 2000 years ago, but the youngest lava field, the Svínahraunsbruni (Brennisteinsfjöll volcanic system) dates from the year 1000 and was also called Kristnitökuhraun, because at the time of the eruption, the Icelandic vikings had a dispute in Þingvellir about the question, if they should become Christians, to which, in the end, they acquiesced.