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Dynowice, Gmina Świerzawa, Złotoryja District, Lower Silesia (Dolnośląskie), Poland

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Latitude & Longitude (WGS84): 51° 4' 4'' North , 15° 52' 3'' East
Latitude & Longitude (decimal): 51.0677777778, 15.8675
Dynowice Location: Wygorzel hill south of Dynowice village, rocky crag on the NE slope

Geology: Rotligendes, rhyolites, autoclastic breccias, lavas or ignimbrites (?)

In the vicinity of Dynowice and Nowy Kościół, in the central part of the North-Sudetic Basin, an extensive outcrop (8 x 2 km) of ryolites and related volcaniclastic rocks mantles the Świerzawa horst from the NW and N. The section exposed at Stop 4/4, in the NW part of this outcrop, is over 30 m high. Two successive rhyolite units (sheets), 10 m and 20 m thick, can be distinguished. They dip to the NE at 30-55º. Their lower and central parts are massive to blocky- and platy-jointed parallel to the base and top. The platy joints are spaced at 30-50 cm and fine lamination can be seen in places. Towards the top of the sheets a gradation into brecciated zones 5-10 m thick is observed. The degree of brecciation varies from zero (platy jointed rhyolites showing no evidence of displacement or rotation) through incipient (cracked rhyolites with insignificant displacement of the component fragments) to strong (breccias with well defined angular blocks, cm to dm in size, a finer matrix, and a chaotic fabric). The most strongly brecciated rocks form irregular “pockets”. The described section probably represents two successive, partly autobrecciated, rhyolitic lava flows or extremally welded rhyolitic ignimbrites (?).

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Assesment Field Workshop On The Late Palaeozoic Volcanism At The Northern Margin Of The Bohemian Massif: Southwestern Poland – Northen Czech Republic – Eastern Saxony. Edited by
M. Awdankiewicz and C. Breitkreuz. June 2006.

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