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Outcrops of Carboniferous claystones are in ravines by the stream behind the village Vranov. It belongs to the Carboniferous relict pan with preserved coal seam. The Carboniferous shale outcrops are common findings fossil flora (fossilized wood, cones). Pelvis occupies an area of about 2.5 km2. The rocks are equivalent Nýřanská seam age vestfálu D (Upper Carboniferous). Based Vranov pelvis are coarser arkózové and siliceous conglomerates with inserts and siltstones and claystones their basement rocks are mainly Barrandian neoproterozoika. They are mainly spilite and phyllites, ie slightly metamorphosed rocks that penetrate numerous veins of igneous rocks, mostly paleoryolitů, paleodacitů and paleoandezitů. To soften overburden sediments, interspersed with fine-grained conglomerates and arkoses arkózové with inserts clays and gravel plant. The main seam thickness not exceeding 0.5 m, below are two more powerful seam 15 cm and several middlings. In the same work the author states that the Carboniferous relics around silver deposited probably nehlubokých mezihorských sníženinách between the ridges of the mountains then.

It is a paleontological locality Upper Carboniferous and are there remains of coal mining (heap dumps). Carboniferous Period is known for its coal deposits, which indicate very lush vegetation that time. Primeval forests covered the plants in Upper Carboniferous already very large areas of the Earth. Then determine the overall character of tree-like lycopodium, horsetails and ferns, to which also belonged seed ferns and cordaity. In the locality are mainly fragments of petrified wood logs then treelike plants, their cones and abundant rubble and debris of leaves and twigs). Pelvis belongs to limnetic areas of Central and Western Bohemian Late Palaeozoic.

The area is very heavily anthropogenically used, especially for recreational activities cottagers. There is a deterioration of the site anthropogenic activities.

GPS position

N 49° 45.838', E 13° 2.737'