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Progress in Earth and Planetary Science
Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Early Jurassic extrinsic solar system dynamics versus intrinsic Earth processes: Toarcian sedimentation and benthic life in deep-sea contourite drift facies, Cardigan Bay Basin, UK

Fig. 8

Other ichnological features. a Phycosiphon incertum morphotype 2—spreiten burrows visible in horizontal section. This level contains isorenieratane (Xu et al. 2018a, b); in that case, this biomarker does not indicate anoxic bottom conditions, 811.60 m. b Palaeophycus—cylindrical, pyritized structure with conspicuous lining, 785.2 m. c Schaubcylindrichnus (S)—cylindrical, lined structures flattened by compaction, 702.5 m. d Mottled mudstone (“undulated bedding”), sediment homogenized by meiofauna activity. This level contains isorenieratane (Xu et al. 2018a, b); in that case, this biomarker does not indicate permanent anoxic bottom conditions, 819.2 m. e Zoophycos galleries (Z) composed of fan-like, spreiten structures, 782.6 m. f Rhizocorallium (Rh), Thalassinoides (Th) and Phycosiphon incertum morphotypes 1 (Ph1) and 3 (Ph3), 801.8 m. g Chondrites, 803.1 m. h Lamination in claystone/mudstone, in places broken by bioturbation (Phycosiphon incertum morphotype 2, Ph2). In the lower and upper part “pinstripe” broken lamination with silty lamina and incipient ripples indicate recurrent activity of weak currents. Despite the presence of isorenieratane in this interval (Xu et al. 2018a, b), current activity and the presence of bioturbation do not support for anoxic conditions on the bottom surface. Depth 811.60 m. i Stiff ground and uneven omission surface with Thalassinoides (Th) and Skolithos (Sk); Phycosiphon incertum morphotypes 2 (Ph2) and 3 (Ph3) were left in soft sediment. Depth 730.0 m. Scale = 1 cm

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