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In the area of the Aggtelek-Rudabánya Mts, limestone and dolomite of reefal and lagoonal facies were formed on a platform, which was continuously deepening from the beginning of the Middle Triassic. The bulk of the limestone is represented by lagoonal formations, extremely rich in dasycladaceans. The reefal formations are of patch reef origin. The almost continuous development and the remarkable abundance of fossils permitted the elaboration of an Anisian-Carnian dasycladacean biostratigraphy. On the basis of investigations 4 assemblage zones could be separated in the Anisian, and 6 in the Ladinian-Carnian. In establishing this biostratigraphy dasycladacean investigations of similar facies areas of the Silica Plateau and the Northern Calcareous Alps were also taken into account.

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The Middle Triassic Wetterstein Limestone was investigated on the Feuerkogel, in the eastern Höllengebirge area, Austria. Cephalopod-bearing coquina interbeds consisting predominantly of orthocone cephalopods were found within the dasycladacean inner platform lagoon facies. Based on sedimentological studies the coquina beds are interpreted as storm accumulations. Dasycladacean biostratigraphic data permit assigning the studied succession to the Late Anisian-Early Ladinian interval. Ammonites of age-diagnostic value found in the coquina horizon suggest the Avisianum Subzone of the Reitzi Zone that corresponds to the upper part of the Anisian.

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Introduction Microfossils from the Cretaceous of the Zengővárkony area were first reported by Sztrókay ( 1952 ), evaluating these remnants of dasycladacean algae ( Sztrókay 1952 ) or unidentifiable microorganisms ( Pantó et

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