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Progress in Earth and Planetary Science
Fig. 2 | Progress in Earth and Planetary Science

Fig. 2

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. 2Fig. 2

Investigated part of the Mochras Borehole showing stratigraphy (stages, ammonite zones, and subzones), lithology, ichnology and geochemistry of the Toarcian section. a Tenuicostatum and Serpentinum zones. b Bifrons–Aalensis zones. O, other, rarely occurring trace fossils: Ar, Arenicolites; Ast, Asterosoma; Ch, Chondrites; Lo, Lockeia; Mon, Monocraterion; Pol, cf. Polykladichnus; Rh, Rhizocorallium; Sip, Siphonichnus; Sk, Skolithos. Trichichnus (filamentous mat-forming, sulfide-oxidizing bacteria and “pyritized tubes”) represent traces of unidentified life activity/disputable origin. Ub—micrite/mudstone of ‘massive’ appearance, with undulated or cuboid parting. Geochemistry: δ13CTOC—carbon isotope curve (after Xu et al. 2018a); XRF-derived calcium record (after Xu et al. 2018a). Cyclicity: thin dashed lines—4th order (c. 20 kyr) cycles; solid gray lines—3rd order (c. 100 kyr) cycles; red lines—2nd order (c. 405 kyr) cycles; grey bar on the right—1st order (c. 2.5 Myr) cycles expressed in bottom oxygenation (shaded) and ichnology. Foraminiferal biotic crisis after Reolid et al. (2019). Red bars in the metric depth column—position of the sections presented in Fig. 4. Biostratigraphy from Page in Copestake and Johnson (2014) and McArthur et al. (2016) as summarised in Additional file 3

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