His diploma thesis was dedicated to characteristic classes of flags of foliations. Geometric quantization of Poisson manifolds and symplectic foliations also is developed. Intersection lineations can also be due to the intersection of two foliations. Involutive distributions are the tangent spaces to foliations. Those "C" foliations that arise in practice are usually "smooth-leaved". Micaceous minerals form planar surfaces known as foliations perpendicular to the principal stress fields. Some species have foliations (leaf-like extensions) on S8 and/or S9. The entire massif consists mainly of granite and granite gneiss (a metamorphic rock with foliations). They were generally seen with foliations as well. The foliated chart is the basic model for all foliations, the plaques being the leaves. The induced foliations of are called the 2-dimensional Reeb foliation (of the annulus) resp. Commonly developed features include transposition foliations, lineations, stylolites, folds, and reverse faults. Sills parallel beds (layers) and foliations in the surrounding country rock. A rather trivial example of foliations are products , foliated by the leaves . This makes possible another definition of foliations in terms of regular foliated atlases.