标题：GAS GENERATION IN CARBONIFEROUS SOURCE ROCKS OF THE VARISCAN FORELAND BASIN: IMPLICATIONS FOR A CHARGE HISTORY OF ROTLIEGEND DEPOSITS WITH NATURAL GASES
摘要：Over 100 ammonites were collected from a block of bedded shallow-water tramberk Limestone at a new location at the Kotou Quarry, near tramberk (Silesian Unit, Czech Republic). Berriaselline neocomitids, including Berriasella jacobi, B. oppeli, Tirnovella allobrogensis, T. cf. allobrogensis, Delphinella consanguinea, Pseudosubplanites cf. grandis and Malbosiceras cf. asper, are the most abundant species in this ammonite association. The olcostephanitid, Spiticeras blancheti, is rare. The index species for the Early Berriasian, B. jacobi, occurs in large numbers. On the basis of the present study, the upper boundary of the stratigraphic range of the tramberk Limestone in the type area is dated as early Berriasian (ammonite Berriasella jacobi Zone). Ammonites with ages younger than early Berriasian have never been found in the tramberk area. The deposition of the tramberk Limestone in the tramberk area came to an end during that period.
关键词：ammonites;Berriasian;tramberk area;Outer Western Carpathians
