The Eocene Hieroglyphic beds and Green shales in the Rożnów Lake area (Silesian Nappe, Outer Carpathians) - facies development and biostratigraphy

Abstract

Abstract:In the lithostratigraphic section of a sedimentary sequence of the Silesian Nappe in the area of Rożnów Lake, the strata that occur above the Ciężkowice sandstone and below the Globigerina marls are represented by a relatively thin unit informally named the Hieroglyphic beds and a succeeding thick complex of so-called Green shales. The Hieroglyphic beds, deposited over a short time interval during the Lutetian time (Reticulophragmium amplectens zone), are followed by the Green shales that were deposited from the Lutetian to the Priabonian (Reticulophrgamium amplectens, Ammodisus latus, Reticulophragmium rotundidorstum zones). This work describes the foraminiferal assemblages, on the basis of which, the age of the Green shales was established that in the area of Rożnów Lake. Deposition of the Green shale unit started in the Lutetian, while in other regions of the Silesian Basin it is documented from the Priabonian. The upper boundary of the Green shales is isochronous and defined by the base of the calcareous horizon of a specific type of marls known as the Globigerina marls.

Agglutinated Foraminiferal Acmes and Their Role in the Biostratigraphy of the Campanian–Eocene Outer Carpathians

“…Abundant R. amplectens in the middle Eocene is reported from the Outer Carpathians. It was observed in the Magura Nappe [16,17,19,21,26,43,53,81], in the Silesian Nappe [12,41,54,[82][83][84], in the Dukla Nappe [32], in the Subsilesian Nappe [18], and in the Skole Nappe [30,76]. The R. amplectens acme is known from the Eastern Carpathians (e.g., [85][86][87][88], and from the deep-water Atlantic and North Sea [89,90].…”

“…A high relative abundance of H. walteri is known from the Eocene of the Magura Nappe [7,16,17,19,[21][22][23]26,42,53,91], from the Skole Nappe [76] and from the Silesian Nappe [28,40,82]. In the Eastern Carpathians, an increased share was described from dark Eocene deposits [94].…”

“…Relatively abundant S. spectabilis are observed in the Silesian, Skole, and Subsilesian nappes in the Reticulophragmium amplectens zone and in the lower part of the Ammodiscus latus zone. It occurs in the Eocene in the Silesian Nappe [28,40,82,89], and in the Skole Nappe [40,76]. A Spiroplectammina spectabilis zone marked by the dominance of S. spectabilis was distinguished in the upper Eocene of the Eastern Carpathians [86,103].…”

“…latus are known from the middle-upper Eocene [40,108]. The species was reported from the Silesian Nappe [41,54,82], from the Skole Nappe [30,76], from the Dukla Nappe [72] and from the Magura Nappe [19,26,109].…”