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Straznik

Breaks in abandoned quarry Nová Paka

Sedimentary rocks of Kumburk formation – Štikov arcoses from the Barruelian age (300 million years ago) are shown on the wall of the abandoned quarry. Light grey or violet-grey arcosis and arcosic sandstones often include quartz pebbles or crystalline schists. Arcoses are distinctly horizontal and cross-bedded with fluvial channels. Thin layers of violet-grey and green-grey siltstones or enclaves of haematite – rich sandstones are clearly visible inside the arcoses.

There are three silicified wood of Dadoxylon type embedded in various directions and levels inside north wall of the quarry. The biggest of them is about 75 centimetres thick in diameter. Sub vertical dike of Miocene basalt rock with maximal thickness of 1 metre intrudes on the east wall of the quarry. Small basalt bed of breccia structure with typical hexagonal seclusiveness occurs near bottom of the quarry, it is probably the remnant of volcanic dike channel.

GPS position

N 50° 29.037', E 15° 30.085'
[GPX]

[MAPY.CZ]

Contact

Geopark UNESCO Český ráj
Jiří Vlasák
e-mail:vlasak@geopark-ceskyraj.cz
http://www.geopark-ceskyraj.cz