The Jurassic and Cretaceous of Bachowice

Abstract

Above the Senonian marls of the northern most element of the Sub- Silesian nappe one encounters numerous exotic blocks of crystaline, Paleozoic, Jurassic, and Cretaceous rocks. Distinguished among these blocks, on the basis of the quite abundant fauna, were the following: 1) sandstones of the Aalenian and Bajocian; 2) Posidonomya marls of the Bathonian; 3) variegated limestones of the Bathonian and Callovian; 4) crinoidal limestones of the Callovian and, perhaps, of the Lower Oxfordian; 5) pink, bluish, green, and yellow subcrinoidal limestones (see footnote on page 310) of the Middle Oxfordian and, perhaps, of the Upper Oxfordian; 6) green pelitic limestones of the Kimmeridgian; 7) white subcrystalline limestones, Calpionella limestones, and white subcrinoidal limestones of the Tithonian; 8) grey siltstones belonging probably to the Valanginian or Infravalanginian; 9) pink limestones with Globotruncanae and other planktonie Foraminifera and Inocerami\ they belong to the Cenomanian, probably the Upper one, and the Turonian; 10) greenish limestones, belonging partly to the Turonian and representing in their main mass the Lower Coniacien; 11) white limestones, probably belonging to the Upper Coniacien; 12) red limestones, representing the Santonian and Campanian; 13) tuffites which were formed in consequence of eruptions between the Campanian and the Lower Eocene. The Cretaceous limestones probably reposed in transgression on the Jurassic, containing, as they do, blocks and pebbles of the Tithonian and Kimmeridgian. The Jurassic sediments belonged to the Mediterranean province, this being indicated by their fauna with a predominance of Phylloceras and Lytoceras. The calcareous sediments of the Cretaceous were also directly associated with the Carpathian geosyncline, being probably formed in some parts of the axial zone of the Flysch geosyncline. These formations must have been, towards the end of the Qretaceous, uplifted above the sea-level and, in consequence of a slump of the coastal cliffs or owing to a volcanic explosion, they were introduced into the sediments of the lowest Tertiary, where they constitute a deposit having the character of a colluvial deposit.