The vast quantity of this unworked fuel would be sufficient to warm the whole population of Iceland for a century; this vast turbary measured in certain ravines had in many places a depth of seventy feet, and presented layers of carbonized remains of vegetation alternating with thinner layers of tufaceous pumice.
A tőzegréteg vastagsága egyes szakadékok mélyén mérve a 2,5 métert is elérte. Rétegeiben elszenesedett, elmállott törmelék váltakozott habkőszerű tufalapokkal.