Triassic and Jurassic beds in Krim Mountain area (Slovenia)

Miloš Miler,Jernej Pavšič

doi:10.5474/geologija.2008.010

Abstract

The Krim Mountain and its surroundings are characterized by Upper Triassic to Middle Jurassic rocks, which were deposited on the northern margin of the Dinaric Carbonate Platform. Upper Triassic beds are represented by Main dolomite that exhibits supra- to subtidal Lofer facies. The uppermost Triassic is characterized by approximately 40 m thick horizon of dolomitic breccia. Upper Triassic beds pass gradually into Lower Liassic dolomitic breccia, coarse-grained dolomite and micritic limestone. Presence of dolomitic breccias and absence of supra-intertidal sedimentary structures indicate sea-level rise. Middle Liassic beds consist of oolitic-oncolitic and lithiotid limestones deposited in alternating restricted lagoonal and open shallow-water environment. Upper Liassic beds are characterized by oolitic-oncolitic limestones, bituminous dolomitized limestones and dolomitic breccia deposited in high-energy shallow-water environment. Middle Jurassic beds consist of oolitic, oolitic-oncolitic and micritic limestones, formed predominantly in high-energy subtidal environment.

Highlights

Krim Mountain (Fig. 1) with its 1107 m.a.s.l. represents one of the highest hills in the Ljubljana region
Krim Mountain and its surroundings are characterized by Upper Triassic to Middle Jurassic karstified platform carbonates and are famous for outcrops of characteristic Lower Jurassic stratigraphic unit; the “Lithiotid horizons’’
In order to improve our understanding of Lower Jurassic – Middle Jurassic lithostratigraphy of the area, we performed detailed mapping of the area, accompanied by lithostratigraphical study

Summary

Introduction

Krim Mountain (Fig. 1) with its 1107 m.a.s.l. represents one of the highest hills in the Ljubljana region. Middle Liassic beds are represented by four different facies associations: oolitic-oncolitic limestone, lithiotid limestone, rare limestone breccia and dolomite, and limestone with corals (Fig. 3). The Middle Liassic age of oolitic-oncolitic limestone was determined according to abovementioned well preserved fossils. The Middle Liassic age of limestone breccia and dolomite was determined on basis of their stratigraphic position.

Results

Conclusion