Kilka przekrojów przez górną jurę południowo-zachodniego zbocza Gór Świętokrzyskich

Abstract

SOME CROSS-SECTIONS THROUGH THE UPPER JURASSIC OF THE SOUTH-WESTERN SLOPE OF THE HOLY CROSS MTS Summary The paper deals with some cross sections through the Jurassic belt in the south-western marginal area of the Holy Cross Mountains. The strata of this belt consist of limestones and marls of the upper Malm and of chalky sandstones being referred to the Albian stage. The author describes the lithological development of the Astartian and Kimmeridgian, in which he distinguishes 20 lithologic-stratigraphical members. These may be groupped into 7 facies-lithological complexes as follows: I. complex - "sub-reef complex" - comprises l. and 2. members (white oolitic limestones) and 3. member - oolite. II. complex - "great reef-complex" - consists of various reef limestones: 4 - white reef limestones, not all too hard, with corals, dicerases, a.o., 5 - hard limestones with corals and oysters, 6-9 - various kinds of reef limestones with corals, solenoporae and thick-conchoidal mollusks and gastropods, III. complex - 10-12 members - represents a series of platy limestones, frequently of a lithographic type. It contains also gray clayey marls and a characteristic interbedding of yellow limestones with the intraformational conglomerate, IV. complex - "main oolite" (13-16 members) consists of finegrained oolitic series, some tens centimetres in thickness, divided by an interlayer of pelitic limestones, being some metres thick, with thin bands of coarse material ("banded" limestone) and flints (member 14). At the top an almost stable pisolitic horizon occurs (member 16), V. complex - a series, some metres thick, of gray, clayey, well-bedded limestones with secondary interbeddings of muschelkalks (17), VI. complex is made up of an oyster-exogyra series, 30-40 m in thickness (18), VII. complex - contains gray marls and marly limestones (member 19) and marly clays (member 20) with interbeddings of muschelkalk (exogyras and oysters), gervillea etc. The author lays provisionally the boundary between the Astartian and the Kimmeridgian at the member 14 ("banded" limestone) there.