Thulborn, Tony Sauropod footprints in thinly-layered sediments responsible for ‘onion-ring’ effect in broken or weathered specimens. <p>A, example broken obliquely, showing extent of laminations enclosing the entire footprint. B, example broken horizontally, revealing typical ‘onion-ring’ pattern of laminations surrounding the footprint.</p> footprints;thinly-layered;sediments;weathered 2013-02-20
    https://plos.figshare.com/articles/figure/_Sauropod_footprints_in_thinly_layered_sediments_responsible_for_8216_onion_ring_8217_effect_in_broken_or_weathered_specimens_/304073
10.1371/journal.pone.0036208.g015