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: 201-190
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: Blue Lias Formation and lower Charmouth Mudstone Formation
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: Shallow marine shelf with alternating limestone, marl, and mudstone, fluctuating seafloor oxygen levels, and occasional terrestrial material carried from nearby land
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: Ammonites, belemnites, bivalves, brachiopods, fish, sharks and rays, ichthyosaurs, plesiosaurs, pterosaurs (Dimorphodon), fossil insects, leaves, and plant debris
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: A shallow Early Jurassic shelf sea spread across the area after marine flooding of the former Triassic landscape; shell-rich and burrowed beds alternated with darker oxygen-poor muds, preserving fish and marine reptiles exceptionally well; ammonites and belemnites were abundant, while insects, leaves, and terrestrial animal remains such as dinosaurs were washed in from nearby land
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