Figure 5
From: Exceptional sulfur and iron isotope enrichment in millimetre-sized, early Palaeozoic animal burrows
(A) Shows a filtered micro CT sub-volume highlighting the geometry and morphology of TPS (PTs were excluded this reconstruction). Note that TPS exhibit sheath-like morphology with collapse fabric that was most likely acquired during dewatering and bed compaction. The presence of well-preserved “knick points” (white arrows) indicates that TPS were constructed relatively early, prior to significant mud compaction. (B) close-up of a representative TPS. Note the well-developed knick separating two well-developed pyritic tubular bodies. (C) shows a vertical cross section through a representative TPS. Note the well-developed and continuous sheath morphology with a pyritic wall thickness of ~ 85 micron and a continuous overall diametre of ~ 300 micron.
