Acta Geologica 38. (1995)
1. szám - J. Haas - A. Balog: Facies characteristics of the Lofer cycles in the Upper Triassic platform carbonates of the Transdanubian Range, Hungary
2 ]. Haas, A. Balog and why they form a part of almost every textbook dealing with cyclic sedimentation. The study of these sequences was initiated as early as the last century and already in the 1930s they were the subject of pioneering sedimentological investigations (Sander 1936); in the 1960s studies on the Dachstein Limestone paved the way for the modern analysis and interpretation of cyclic carbonates (Fischer 1964); nevertheless, problems of facies interpretation and early diagenesis have not yet been completely solved, and further, more detailed, studies are necessary. The relatively simple structure of the Transdanubian Range, with only subordinate tectonic deformation of its Triassic formations, and continuous drill-core sequences made possible a very detailed observation of the Fig. 1 Lofer cycles in the Dachstein Limestone Formation. A) Cyclic sequence in the Kecskekő quarry (Gerecse Mts) Anomalously thick facies A is indicated by letter M; B) Basal part of a Lofer cycle in core. A = member A; В = member В; C = member C; Core Porva Po-89 (Bakony Mts) 246.2-246.5 m (polished slab) Acta Geologica Hungarica