Roadcut on highway E22. Park at the Almvik's Café parking area.
Attention: This part of the E22 has a high traffic flow!
This outcrop shows massive metaquartzites of the Västervik-Formation with dm to m
scale folding (cf. fig. 4.5a-b). Their axial planes mostly strike NW-SE to NNW-SSE, i.e. parallel
to the northwards adjoining LLDZ. At least two fold generations can be observed, partly
causing fold interferences which produced dome-like structures with a sub-horizontal
axis. Many planes contain slickensides on their polished surface. Preserved sedimentary
structures like cross-bedding are rare but can be found with careful observation (cf. fig. 4.5c).
To the naked eye these rocks look like typical metaquartzites, but thin sections often reveal mylonitic
fabrics, including distinct textures (lattice-preferred orientation). Compared to the hinge zones the limbs
of the folds have experienced a higher mylonitic deformation and recrystallization (A. Vollbrecht, pers.
comm.; cf. fig. 4.5d-e). It is discussed if parts of these fold structures result from gravitational collapse.
Aside from the metaquartzites, a dolerite (amer.: diabase) dike crosses this outcrop and can be found
on both sides of the road.