Staropaleozoiczne metałupki z radiolariami w seriach metamorficznych okolic Pustkowa Wilczkowskiego (Dolny Śląsk)

Abstract

Old Paleozoic metashales with radiolarians in metamorphic complex of the Pustków Wilczkowski vicinity In the metamorphic complexes lying 30 kilometres South of Wrocław (fig. 1) there have been discovered radiolarians (Pl. I, Fig. 1, 2) belonging to the Spumelina sub-order (Pl. II, Fig. 1, 2). The radiolarians are of considerable proportions (0.2 — 0.4 mm in diameter). The presence of radiolarians indicates that the metamorphic complexes of Pustków Wilczkowski are not PreCambrian. The lower age boundary of metalydites with radiolarians fall in Cambrian and the upper in Lower Devonian. They are delimitated consecutively — the lower stratigraphical range of radiolarians (Moore 1964) and the age of transgressive metaconglomerates complex of Silesicum Strzelin Hills where metalytide pebbles have been recorded (Scheumann 1936; Wójcik 1974; Obere 1966). It has been agreed that the metalydites most probably represent Silurian. This determination has been based upon the recognized correlations (Cloos 1922; Fabian 1939; Teisseyre 1964) with the neighbouring regions (Kaczawa Mts and Bardo Mts), where the metalydites with radiolarians age is documented by graptolites. For the younger than the Cambrian age testify also the large radiolarian dimensions similar to the large contemporary forms.