Commune: Trzebinia (pow. chrzanowski, woj. małopolskie)
Framework element or context represented:
Sedimentology and lithostratigraphy of Lower Permian.
Primary geological/geomorphological interest:
Lower Permian continental conglomerate (fanglomerate).
Comparative assessment justification:
Sequence of the Lower Permian continental deposits unique for the Central Europe. Lithotype of Lower Permian postorogenic conglomerates. The best site among few outer outcrops in the Cracow-Silesian Upland.
Protection status and accessibility:
Candidate for protection as a documentary site.
Character of site: Outcrop partly artifical.
Area: 2 ha
Altitude: 390 m a.s.l.
Lithology: conglomerates, breccias
Discipline: Palaeoenvironment, Stratigraphy of Phanerozoic
Process Age: *all periods
Bedrock Age: Permian, *all periods
Description of primary interest:
The Lower Permian Myślachowice Conglomerate is exposed excellently on the slope above the village. It is a part of the classic sequence of Upper Carboniferous – Lower Permian continental deposits of the Cracow – Silesian Upland. The underlying sandstones and arkoses of the Vestfalian age are visible in the scarp of the road just below the main outcrop, at the bottom of the profile. The conglomerate is relatively hard and cemented. It is composed of more or less rounded grains, pebbles and fragments of light-grey and white Lower Carboniferous limestones and dark-grey Devonian limestones and dolomites as dominant components of this deposit. Volcanic rocks (porphyry, tuff), quartzes, quartzites, sandstones and shales constitute the admixture. The material is poorly sorted. Beside sandy fraction, grains and small pebbles (1 – 3 cm), fragments exceeding 20 – 30 cm occur. The sandy or marly matrix is very poor. The Myślachowice Conglomerate represents postorogenic continental deposits of the fanglomerate type accumulated after a short transport at the food of mountains formed mainly of Devonian – Lower Carboniferaous carbonates, synchronously to the volcanic activity.
Literature:
GRADZIŃSKI R. 1972–Przewodnik geologiczny po okolicach Krakowa (Polish only). Wyd. Geol. HEFLIK W. & SIEDLECKA A. 1962–Petrographic characteristics of pebbles of effusive rocks occuring in Permian sediments in the vicinity of Olkusz (English sum.). Ann. Soc. Geol. Pol. 32, 1: 71-81. ŁYDKA K. 1955–Petrographic studies concerning the Permian-Carboniferous of the Cracow Region (English sum.). Biul. Inst. Geol. 97: 115-227. SIEDLECKA A. 1964–Permian in the north-eastern border of the Upper Silesia Coal Basin (English sum.). Rocz. Pol. Tow. Geol. 34: 309-386. SIEDLECKI S. 1951–Utwory stefańskie i permskie we wschodniej części Polskiego Zagłebia Węglowego (Polish only). Acta Geol. Pol. 2: 300-348. SIEDLECKI S. 1952–Podłoże melafiru w Regulicach i problem genezy zlepieńców myślachowickich (in Polish, Russian sum.). Biul. Inst. Geol. 80: 103-129. SIEDLECKI S. 1954–Palaeozoic formation of the Cracow Region (English sum.). Biul. Inst. Geol. 73: 1-415.