The geology of the Leirpollen area, Tanafjord, Finnmark.

Abstract

900 metres of sedimentary rocks, including Eocambrian tillits, have been mapped on 1:50 000 and 1:25 000 scales around Leirpollen and correlated with Vestertana Group which outcrops on the Digermul Peninsula. The rocks consist almost entirely of clastic sediments; volcanic rocks are absent and carbonates extremely rare. The Vestertana Group begins with two tillite formations which appear to be absent in the east. The upper part of the group consists of cleaved mudstones, siltstones, orthoquartzites and greywacke sandstones. Body fossils have not been found but trace fossils are present and are common in the upper part of the group. The rocks are folded with axes trending approximately SSW-NNE. The intensity of the folding decreases towards the east. In the extreme west of the area some overturned synclines occur and are associated with steeply-dipping reverse faults.