International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

Synsedimentary slumping in fold-and-thrust system of the Magura Zone: evidence from olistoliths in the Beloveza Formation (Zbludza area, Poland)

Pages: 177 - 184

Authors: JANUSZ OLSZAK

Abstract: An accumulation of blocks of thick-bedded sandstones and marls, interpreted as olistoliths, was found in the Beloveza Formation in the SE part of the Beskid Wyspowy range (Polish part of the Outer Western Carpathians). The host sediments are bluish shales and thin-bedded fine-grained sandstones. Some bodies of marls and sandstones, up to several millions of cubic meters in volume and standing out in relief, are also interpreted as olistoliths. The olistoliths were deposited during synsedimentary shortening of the Magura Basin, by submarine slumps moving down the slope of an accretionary prism, across depositional zones. The olistoliths described here resemble in their characteristics and geological position those known from the Kamienica Nawojowska valley. This similarity may suggest that olistoliths may have wider extent in this part of the Magura Nappe.

Keywords: Outer Western Carpathians, Magura Nappe, Bystrica Subunit, olistoliths

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