Abstract
The article describes the results of detailed geological mapping of the wider environs of Planina pri Jezeru north of Bohinj. In the literature the Upper Triassic massive and bedded limestone, Jurassic limestone, Cretaceous clastic rocks and Pleistocene sediments have been reported in this area up to now. The article supplements existing lithostratigraphic information by defining exact locations of the Pleistocene sediments at Planina pri Jezeru and Planina v Lazu, and of Jurassic rocks. In Poljane a Neptunian dyke and bioclastic limestone, while north of Mizčna glava a flat-bedded microsparitic limestone were described for the first time. Correlation to the Triglav Lakes Valley Jurassic beds indicates equivalent facieses. Allochthon Cretaceous biocalcarenite and jasper situated east of Planina pri Jezeru are also described due to their importance for further glaciological studies. The results show that the recent lake Jezero na Planini pri Jezeru is formed due to the accumulation of Pleistocene glacial-lacustrine fine-grained sediment in till, deposited on the Dachstein limestone.
Highlights
Lakes in high mountainous environment are sensitive indicators of environmental change
The most wide spread is the Krn nappe (BUSER, 1986, 1987) or the Julian nappe (PLACER, 1999), which consists of bedded Upper Triassic and lowermost Jurassic limestone plus unconformably deposited Jurassic and Cretaceous rocks
The mapping confirmed existence of three types of the Upper Triassic limestone and improved their microlocations. It revealed that a few types of Jurassic limestone outcrop on the eastern side of the Slatna nappe, too
Summary
Lakes in high mountainous environment are sensitive indicators of environmental change. The lake Jezero (46°19’N, 13°50’E) is situated at an elevation of 1430 m a.s.l. in a small depression and belongs to the Triglav Lakes group It has an average surface of 0.0176 km and a maximum depth of 11 m. Condensed sedimentation, which resulted in occurrence of different limestone and clastic rocks, took plače on the deeper-water Julian High from late Early Jurassic till early Cretaceous. The most wide spread is the Krn nappe (BUSER, 1986, 1987) or the Julian nappe (PLACER, 1999), which consists of bedded Upper Triassic and lowermost Jurassic limestone plus unconformably deposited Jurassic and Cretaceous rocks. Three important Dinaric faults cut Fužinske planine from north to south: the Studor fault, the Bohinj fault and the Viševnik fault
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