Nalez mikrofauny z klastov karbonatovo-silicitovych brekcii pri Bohuňove (Slovensky kras, Zapadne Karpaty)

摘要

The carbonate-silicite clasts were discovered near the Bohunovo village in the Meliatic unit. Rocks are localized in the southern part of old quarry. Main part of the quarry consists of the Honce Limestones, which are present in the form of olistholiths in the Jurrasic melange of the Meliatic unit. Studied calcareous-silicitic clastic rocks surround radiolarites and fragments of limestones of the Honce Formation. The carbonate-silicitic rock contains clasts of silicites and carbonates. Well preserved microfossils were found in carbonates, which is not typical for the Meliatic unit. Based on the microfossil dating, two ages of carbonates were determined - the Middle and Upper Triassic. Analysis of the radiolarite clasts also confirmed the Ladinian age. Matrix of the studied rocks is formed by microscopic and submicroscopio parts of surrounding clasts. This derives a problem with the determination of the rock age. Time of sedimentation of the studied rocks is yet unknown. There are two possible interpretations of this age: studied rocks represent a part of the Jurassic melange of the Meliatic unit, or the origin and the age of these rocks is younger, possibly Cretaceous.