Figure 18 in Identification of fossil worm tubes from Phanerozoic hydrothermal vents and cold seeps

Figure 18. Eoalvinellodes annulatus, Silurian, Yaman Kasy, Russia. A–C, NHMUK OR1388a, NHMUK VF52 and NHMUK VF53, respectively, hand specimens of gently curving tubes with folded fabric-like tube wall texture. D, E, UL YKB1, transverse sections of tubes showing thick walls with thick, possibly multi-layered walls. F, UL YKB1, detail of tube wall in transverse section showing preservation by colloform pyrite many layers thick. Scale bars: A, B = 2 mm; C = 1 mm; D, E = 500 µm; F = 100 µm.