Abstract
Paleozoic (Devonian) marine sediments of the Inovo Formation in the Stara Planina Mountains consist of various metaclastic rock varieties: from conglomerates to siltstones and shales, composed of quartz, feldspar, rarely mica and abundant fragments of magmatic acid and basic rocks and intraclasts. On the basis of numerous typical sedimentary structures and textures, the clastics are interpreted as continental (lower or base of) slope deposits, resulting from a variety of mass gravity transports, viz.: debris flow, turbidity current, density-modified grainflow, and grain flow, intermittently combined with traction currents or laminar flows. In some intervals of its history, the continental slope became unstable due to tectonic movements which led to massive submarine sliding, slumping and tearing away of extrabasinal and intrabasinal blocks and olistoliths which slipped down the slope and mostly, by the debris flow mechanism, deposited with normal hemipelagic sediments.
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