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. 2015 May 18;112(22):6892–6897. doi: 10.1073/pnas.1421052112

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Fig. 1. — Biotextures in fresh Cenozoic basalt glass and titanite microtextures in Archean greenschist pillow lavas. Comparison between tubular biotextures in (A) the 110-Ma-old deep sea drilling project (DSDP) sample 418A, 56–2, 129–132 cm, and (B) similarly shaped and sized tubular textures of the interpillow hyaloclastite (sample 29-BG-03) of the 3,470-Ma-old Hooggenoeg Complex. (C) DSDP sample 418A, 62–4, 64–70 cm, showing several dark brown varioles within the fresh glass and biogenerated filaments rooted in a fracture. (D) Figure S2F from ref. 6 suggesting that some of these titanite microtextures may be varioles intermixed with tubular biotextures. (E) Details from sample 29-BG-03 from BGB (22) in which a 6-µm-wide tube, rooted in a titanite-filled fracture, may show a segmented nature. (F) Thin, 2–3-µm-wide segmented tubes extending from the edge of a former glass fragment (now mainly chlorite) from sample 74-PG-04 of the 3.35 Ga Euro Basalt of the PC, Western Australia (5).