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Lias carbonate platform deposits of Velebit Mt. (Croatia)

Deposits from the Upper Paleozoic to Jurassic and Cretaceous of the Velebit Mt. are assigned to the three major sedimnetary megasequences, each separated by a terrestrial phase: 1) Middle Carboniferous - Middle Permian ; 2) Middle Permian - Middle Triassic, and 3) Upper Triassic - Jurassic and Cretaceous. Profile from Kubus-pass (Gospić-Karlobag road) contain continuity from the uppermost part of the Lower Lias to the Middle and Upper Lias with a total thickness of approximately 270m. Shallow-water carbonate deposits was divided into fife litofacies units: 1) Units A, rhythmically alternating mudstone/wackestone and ooid grainstone are interpreted as typical peritidal deposits ; 2) Unit B, lagoonal to shallow subtidal black mudstones with packstone/floatstone intercalations ; 3) Unit C, rhythmically alternating mudstone/wackestone and grainstone/rudstones were deposited in restricted shallow-water areas (lagoonal and shallow-subtidal zones) with periodically agitated water brought in coarse carbonate detritus ; 4) Unit D, shallow -subtidal lagoonal limestones with Litiotid tempestite coquinas and 5) Unit E, bioturbated "spotty limestones" as pure mudstones to peletal wackestones were deposited with a low sedimentation rate in a calm, large shallows beneath the fair-weather wave base, large portion of organic matter and good ecological conditions for mud-eaters.

Carbonate platform, litofacies, shallow-water limestones, desitional environments, Lias, Velebit Mt., Croatia

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