Commune: Hyżne (pow. rzeszowski, woj. podkarpackie)
Framework element or context represented:
Biota and stratigraphy of Early Paleogene Flysh Carpathians.
Primary geological/geomorphological interest:
Profile of Variegated Shale represents radiolarian zonation correlated with forminiferal biozones.
Comparative assessment justification:
Standard profile with rich radiolarian assemblage in the Variegated Shale Fm.
Protection status and accessibility:
Proposed for protection.
Character of site: Natural outcrop.
Area: c. 1 ha
Altitude: 275 m a.s.l.
Lithology: gneisses, other siliceous rocks, shales, silstones, claystones
Discipline: Palaeobiology, Palaeoenvironment, Stratigraphy of Phanerozoic
Process Age: *all periods
Bedrock Age: Paleogene, *all periods
Description of primary interest:
The site is located within the Skole Unit of the Outer Carpathians in the S limb of the Jawornik–Dubiecko overturned fold, in right-side tributary stream of the Tatyna river in Hyżne. It encompasses several small outcrops of the Variegated Shale Fm extending over some 250 m. Being susceptible to surface slumping, the outcrops of this formation undergo fast and intensive changes. The Variegated Shale Fm is about 130 m thick and represents Upper Palaeocene–lower part of Lower Eocene. Composed of muddy and clayey red shales with intercalations of green shales, the rocks contain smectite as the main mineral. Within the complex there are bentonitized tuffites, numerous microconcretions of Mn and Fe oxides, as well as concretions of Mn, Fe, Mg and Ca oxides and carbonates. Distinguished in the rank of members, the lithosomes of the Boguszówka Sandstone /Mbr/, the Kosztowa Sandstone /Mbr/, and the Stripped Chmielnik Sandstone /Mbr/ are integral components of this formation. Their lithologies are diversified and can be attributed to various centres. Close to the bottom of the Variegated Shale Fm there occurs a regional horizon of the Bircza Lithothamnium Limestone /Bed/. An additional, interesting component of the formation in question is represented by lensoidal lithosomes of the Babica Clay, being deposits of cohesive clayey-muddy flows. Four biostratygraphic zones have been distinguished within the profile of the Variegated Shale Fm and overlaying Hieroglyphic Fm on the basis of a rich assemblage of radiolarians, composed of about 50 taxa. Having determined foraminiferas, this profile has also been correlated with forminiferal biozones.
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