Sedimentological Characteristics of Upper Triassic (Cordevolian) Circular Quiet Water Coral Bioherms in Western Slovenia, Northwestern Yugoslavia
Jože Čar, Dragomir Skaberne, Bojan Ogorelec, Dragica Turnšek, Ladislav Placer, 1981. "Sedimentological Characteristics of Upper Triassic (Cordevolian) Circular Quiet Water Coral Bioherms in Western Slovenia, Northwestern Yugoslavia", European Fossil Reef Models, Donald Francis Toomey
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Six circular-shaped quiet water coral bioherms of Upper Triassic (Cordevolian) age, ranging from 25 to 140 meters in height and from 50 to 180 meters in diameter, outcrop 20 kilometers north-northwest of Idrija in western Slovenia, northwestern Yugoslavia. Within the biohermal depositional area two distinctive lithological and faunal associations have been identified. These are: 1. the biohermal core and marginal breccias which pass into, 2. surrounding bedded biopelmicritic limestones. The biohermal cores are composed primarily of corals and consist of various biolithites and biopelmicritic limestones. A relatively quiet water depositional environment is suggested for these bioherms. This interpretation is reinforced by the occurrence of only modest accumulations of marginal breccias, and the occurrence of layered pelbiomicritic limestones between individual bioherms. These circular bioherms are surrounded and embedded in a sequence of interbedded sandstones and shales.