Studia Geologica Polonica  vol. 121 (Abstracts)

Kościeliska Marl Formation (Lower Cretaceous) in the Polish Western Tatra Mountainss: lithostratigraphy and microfossil zones

Andrzej PSZCZÓŁKOWSKI

Abstract
The Kościeliska Marl Formation (Middle-Upper Berriasian to Lower Aptian) terminates the Lower Subtatric Succession in the Western Tatra Mountains. The Upper Berriasian to lowermost Hauterivian deposits of the lower part of this formation are subdivided into four members (Pod Furkaską Member, Kryta Member, Wściekły Żleb Member and Muráň Limestone Member), which are formally described. Two informal units are recognised in the Barremian-Lower Aptian deposits of the upper part of the formation: the nannoconid-foraminiferal limestone unit and glauconitic biocalcarenite bed. The Middle/Upper Berriasian to Upper Hauterivian deposits are subdivided into calpionellid zones and subzones. The upper part of the Kościeliska Marl Formation is biostratigraphically documented by planktonic foraminifers identified in thin sections. The following foraminiferal zones are recognised: Praehedbergella sigali, Blefuscuiana aptiana (new zone), Liliputianella similis, Blowiella blowi and Leupoldina cabri. In the type section, the total thickness of the Kościeliska Marl Formation is 272 m. In general, the deposits of this formation exposed in the Kościeliska Valley, although tectonically disturbed, appear to rest in normal position. The Kira Miętusia sub-unit of the Bobrowiec tectonic unit consists of two tectonic elements (slices): a larger one outcropped in the Wściekły Żleb-Zahradziska area and a smaller scale (composed of the Valanginian-Lower Aptian deposits), poorly exposed south of the Brama Kantaka gate. The studied sections are compared with the selected sections in Slovakia. Sedimentation of the Early Hauterivian Muráň Member (Western Tatra Mts) occurred approximately at the same time as the onset of the Muráň Formation deposition in the Eastern Tatra Mts. The Hauterivian Muráň Member of the Kościeliska Marl Formation and the Strážovce Turbidite Member of the Mráznica Formation (Strážovské Vrchy Mts) are not strictly coeval, the former unit being probably older than the latter one.

Studia Geologica Polonica, 121: 51-79.

Toarcian ammonites (Adneth facies) from the Subtatris Succession of the Tatra Mts (Western Carpathians)

Ryszard MYCZYŃSKI & Jerzy LEFELD

Abstract
Ammonite fauna is described and illustrated from the Kliny Limestone Member (Toarcian-Aalenian - Adneth facies) of the Subtatric Succession in the Tatra Mts. The described forms belong to families Phylloceratidae, Lytoceratidae and Hildoceratidae. The age of the Kliny Limestone Member established on the basis of this fauna is Middle Toarcian-lowermost Aalenian. One form points to Pliensbachian age of the Długa Encrinite Member. Abundance of juvenile ammonite phragmocones has been stated in a horizon of red limestone.

Studia Geologica Polonica, 121: 81-158.

Facies development and lithostratigraphy of the Hightatric mid-Cretaceous (Zabijak Formation) in the Polish Tatra Mountains

Krzysztof P. KRAJEWSKI

Abstract
The paper presents facies development and lithostratigraphy of the mid-Cretaceous Zabijak Formation in the Polish part of the Tatra Mountains. Reference is also made to all known occurrences of the formation in the Slovak part of the Tatra. Geological maps, general and detailed sections, and representative selection of rock samples (Figs 1-60) as well as panoramic photographs of the formation outcrops (Pls 1-17) give insight into the distribution, facies, sedimentary features, lithostratigraphic units, and tectonic position of the mid-Cretaceous sequence in the Tatra Mts.
The Zabijak Formation embraces the youngest sedimentary sequence occurring in the Mesozoic Hightatric Succession. It rests disconformably upon various units of the Lower Cretaceous substratum, and is cut discordantly by the Hightatric and/or Subtatric overthrusts. There are three main sedimentary facies in the formation: (1) the limestone facies; (2) the marly facies; and (3) the marly-silty-sandy (flysch-type) facies. They record three consequent stages in the mid-Cretaceous history of the Hightatric sedimentary basin: (1) submerged carbonate platform with prevailing non-depositional conditions and/or condensed sedimentation (Early to Late Albian); and two basinal stages: (2) hemipelagic marly basin with increasing-upwards input of fine terrigenous material (Late Albian through Cenomanian); and (3) marly distal flysch basin with considerable input of fine terrigenous material (?Early Turonian). The Zabijak Formation is subdivided into three superimposed members (new units): (1) the Żeleźniak Member, (2) the Kamienne Member, and (3) the Pisana Member, that correspond to the three main facies of the formation. Five units of bed rank (new units) are defined as well in the basal part of the formation: (1) the Ku Stawku Bed(s), (2) the Wielka Rówień Bed, (3) the Spady Bed, (4) the Upłazkowa Bed, and (5) the Mułowy Beds. The former two represent condensed limestone facies and infillings of cavities and dykes in the direct substratum, whereas the latter three embrace basal conglomeratic and sandy deposits of the overlying Kamienne Member.