Fig. 4: High-contrast 3D-views to traces assigned to the equilibrium suite.

A, B Helicoidal burrows referred to as cf. Gyrolithes locraensis. Core section M0082D-1H-2WR7, 75.5–82.5 cm, Southern Japan Trench condensed section. C Long and narrow threads of Trichichnus isp. Core section M0089D-1H-5WR36, 34–40 cm, Central Japan Trench condensed section. D, E Irregular and variably oriented ramifying burrow system (Pilichnus), with local helicoidal segments (red arrow). Upwards, towards the colonization surface, the Chondrites-like traces can be associated with few mm wide vertical shafts (yellow arrow). Core section M0089D-1H-5WR35, 15–24 cm, Central Japan Trench condensed section. F A close up to the colonization surface illustrating vertical shafts related to Pilichnus. Red arrow points to a Gyrolithes fragment. The surface is affected by erosion generated by the subsequent gravity flow event. M0083F-1H-10WR16, 0–21 cm, Central Japan Trench expanded section. G, H A Zoophycos-like narrow lobate burrow. Core section M0082D-1H-3WR8, 18–24 cm, Southern Japan Trench condensed section. Note that the core margins have bent downwards due to coring process.