Gogolin Formation

Gogolin Formation – Triassic geologic formation, hitherto named the Gogolin Beds,^[2][3] is the lowermost lithostratigraphical unit of the Lower Muschelkalk in the Silesian-Cracow Upland (S Poland, Central Europe), underlain by the Upper Buntsandstein (Lower Triassic) carbonates and overlain by the Górażdże Formation (Middle Triassic) carbonates.^[4][5]

Historical name coming from Gogolin, a small town in south Poland, where the Gogolin Formation was described for the first time, and where the main stratotypes have been exposed (see section Stratotypes).^[4]

Gogolin
Town
Gogolin
Coordinates: 50°29′N 18°02′E / 50.483°N 18.033°E / 50.483; 18.033
Country	Poland
Voivodeship	Opole
County	Krapkowice
Gmina	Gogolin

The Late Olenekian or Early Aegean (Anisian) to Pelsonian (Anisian),.^[6][7]

The formation is built of various carbonates which were deposited on a carbonate ramp.^[4][8]

This Formation has recently been divided into four members, six beds, and two horizons:^[4][5]

1. Zakrzów Crinoidal Limestone Member, which includes: a) Krapkowice Pelitic Limestone Bed – thin-bedded, wavy bedded and marly micritic limestones, b) Dąbrówka Bioclastic Limestone Bed – thick- to medium-bedded, cross-bedded crinoidal limestones, c) Podbór Bioclastic Limestone Bed – thin- to medium-bedded, graded, horizontally and cross-bedded bioclastic limestones and wavy-bedded micritic limestones;
2. The Skała Marl Member – marls interbedded with micritic and bioclastic limestones; the lowermost part of this member is locally built of broken-up limestone beds and lumps which are covered by an intraformational conglomerate with small intraclasts – they are divided as Kocina Intraformational Conglomerate Bed;
3. The Emilówka Cellular Limestone Member, which includes: a) Karłubiec Bioclastic Limestone Bed – massive, cross-bedded, thin- to medium-bedded bioclastic and micritic limestones, b) Otmęt Marly Limestone Bed – strongly porous, thin-bedded marly limestones that are, in fact, dedolomitized dolomites;
4. Odrowąż marly limestone horizon – marls, thin- to medium-bedded, graded, cross-bedded and horizontally bedded bioclastic limestones and thin layers of platy and wavy bedded micritic limestones;
5. Malnia limestone horizon – thin- to medium-bedded, graded, horizontally and cross-bedded bioclastic limestones, thin-bedded, platy and wavy-bedded micritic limestones;
6. Ligota Hill Wavy-Bedded Limestone Member – wavy-bedded and crumpled micritic limestones intercalated with medium- to thin-bedded, graded, cross- and horizontally bedded, bioclastic limestones.

Stratotypes are located at Gogolin and its vicinity, Błotnica Strzelecka and Ligota Dolna (southern Poland).^[4][5]

• Assmann P., 1913 – Beitrag zur Kenntniss der Stratigraphie des oberschlesischen Muschelkalks. Jb. Preuss. Geol. Landesanst., 34: 658 – 671, Berlin.
• Assmann P., 1944. Die Stratigraphie der oberschlesischen Trias. Teil 2: Der Muschelkalk. Abhandlungen des Reichsamtes für Bodenforschung, Neue Folge, 208: 1–124.
• Kowal-Linka M. 2008. Formalizacja litostratygrafii formacji gogolińskiej (trias środkowy) na Śląsku Opolskim. Geologos 14 (2): 125–161 (and the references; the paper in Polish with English summary).
• Kowal-Linka M. 2009. Nowe jednostki litostratygraficzne w randze warstw w obrębie formacji gogolińskiej (trias środkowy) na Śląsku Opolskim. Geologia 35 (2): 153-174 (and the references; the paper in Polish with English summary).
• Kowal-Linka, M., Stawikowski, W., 2013. Garnet and tourmaline as provenance indicators of terrigenous material in epicontinental carbonates (Middle Triassic, S Poland), 291: 27–47.
• Nawrocki, J.; Szulc, J. (2000). "The Middle Triassic magnetostratigraphy from the Peri-Tethys basin in Poland". Earth and Planetary Science Letters. 182: 77–92. doi:10.1016/s0012-821x(00)00230-2.
• Niedźwiedzki R., 2000: Litostratygrafia formacji górażdżańskiej i formacji dziewkowickiej na Śląsku Opolskim. Prace Geologiczno-Mineralogiczne, 71, 1–72 (and the references; the paper in Polish with English summary).
• Zawidzka, K (1975). "Conodont stratigraphy and sedimentary environment of the Muschelkalk in Upper Silesia". Acta Geologica Polonica. 25: 217–256.

• http://www.geologos.com.pl/archive.php?issue=11
• http://journals.bg.agh.edu.pl/GEOLOGIA/index.php?vol=2009-02
• Kowal-Linka, Monika; Stawikowski, Wojciech (2013). "Garnet and tourmaline as provenance indicators of terrigenous material in epicontinental carbonates (Middle Triassic, S Poland)". Sedimentary Geology. 291: 27–47. doi:10.1016/j.sedgeo.2013.03.005.