| The beds at this level are distinctly pyritic and the basal Psiloceras-bearing limestone is underlain by a 20 m thick black shale. |
| It is underlain by schist, phyllite, and quartzite, although outcrops of serpentine are common in the area. |
| Most of the route stretches through rolling green hills and intervening rice paddies underlain with rich red lateritic soils. |
| The crest of the Blue Ridge is usually underlain with Precambrian or Cambrian igneous rocks. |
| The other zone that is almost underlain by a zone in which all interconnected openings are full of water is considered as the saturated zone. |
| During shortening, the domains underlain by a frictional decollement were pinned at this facies boundary. |
