Commune: Fredropol (pow. przemyski, woj. podkarpackie)
Framework element or context represented:
Stratygraphy and palaeoenvironment of deposits in the marginal zone of the flysh Carpathian nappes.
Primary geological/geomorphological interest:
Lower Miocene conglomerate on the border of the Outer Flysch Carpathians.
Comparative assessment justification:
Stratotype of Lower Miocene Dubnik conglomerate composed with exotic of different age.
Protection status and accessibility:
Protection as documentary site of inanimate nature (1995).
Character of site: Natural outcrop.
Area: 0.5 ha
Altitude: 250 m a.s.l.
Lithology: conglomerates, breccias
Discipline: Geomorphology, Palaeoenvironment, Stratigraphy of Phanerozoic, Tectonics
Process Age: *all periods
Bedrock Age: Neogene, *all periods
Description of primary interest:
The site represents a natural outcrop forming a steep, rocky promontory in a low terrace of the left bank of the Wiar river in the hamlet Dubnik. The rocky form is about 100 m long and up to 20 m high, built of a conglomeratic complex lying in the reversed position (165/50/SW), developed in the facies of the oldest Stebnik Beds. The rocks are sandy-conglomeratic with large-scale cross-bedding. They contain pebbles with the diameters up to 20 cm, derived, according to some authors exclusively, and to some others almost exclusively from extra-Carpathian material, i.e. from the Dobrudja - Holy Cross structural ridge. The inventory of the pebbles includes mainly Jurassic limestones (Oxfordian, Titonian); green and red, Precambrian (?) phyllites, quartzites, granites, gneisses, porphyries, and also cherts, sandstones and marls. These strata, of a marginal character, were deposited in a pericratonic trough, situated along the then edge of the Outer Carpathian geosyncline, as a result of diastrophic processes taking part there. Such an origin is also indicated by the transport direction of the material in the conglomerates from NW to SE. The complex described rests as a lensoidal lithosome on the peri-Carpathian salt-bearing formation and under the Stebnik Beds, and belongs to the Kniażyce scale of the Borysław-Pokucie Unit.
Literature:
GARLICKI A. 1973–Results of study on the salt-bearing Miocene deposits South of Przemyśl. (English sum.). Kwart. Geol., 17/1: 92-104. GONERA M. 1991–Paleontological and stratygraphical sites protection in Polish Carpathians. (English sum.). Ochrona Przyrody 49, II: 119-141. GONERA M., ALEXANDROWICZ Z. & URBAN J. 2000–Protected areas and objects. In: Alexandrowicz Z. & Poprawa D. (reds) Geodiversity coservation of the Polish Carpathians. (English sum.), Państw. Inst. Geol., Warszawa: 98-108. KOTLARCZYK J. 1988–Problemy sedymentologii, stratygrafii i tektoniki Karpat przemyskich oraz ich najbliższego przedpola. (Polish only). In: Kotlarczyk J. & Pękala K. (reds) Przewodnik 59 Zjazdu Pol. Tow. Geol. w Przemyślu: 23-62. KOTLARCZYK J. 1991–Budowa geologiczna, rzeźba i krajobraz.(Polish only). In: Turnicki Park Narodowy w polskich Karpatach Wschodnich. Pro. Natura, Kraków: 15-40. NEY R. 1957–On exotics of Jurassic limestones from the marginal Carpathian area and the foreland between the San and Wiar rivers. (English sum.). Acta Geol. Pol., 7/2: 259-270. NEY R. 1957–The Miocene in the Carpathian foreland between Przemyśl and Chyrów. (English sum.). Przegl. Geol., 5/1: 12-18. NEY R. 1979–Sedymentacja dolnomioceńskich utworów jednostki stebnickiej. (Polish only). In: Kotlarczyk J. (red.) Stratygrafia formacji z Ropianki (fm). Poziomy z olistolitami w Karpatach przemyskich. Mat. Teren. Konf. Nauk. w Przemyślu: 38-43. WATYCHA L. 1964–Budowa geologiczna okolic Birczy, Olszan i Rybotycz. (Polish only). Biul. Państw. Inst. Geol. 33: 1-114.