Extended Data Fig. 7: Small carbonaceous fossils from levels A3–4 and A11 at Castle Bank.
From: A Middle Ordovician Burgess Shale-type fauna from Castle Bank, Wales (UK)
a–g, portions of brachiopod shell layers probably sourced from Apatobolus micula; a, PMU 39383/1; b, PMU 39372/1 enlarged in (b1), showing pitted surface produced by spongy wall; c, PMU 39349/3 enlarged in c1, showing pitted microstructure; d, PMU 39387/1 enlarged in (d1) and (d2), showing reticulated to anastomosing networks; e, PMU 39391/1 enlarged in (e1), showing reticulated surface structure; f, PMU 39350/2 enlarged in (f1), showing reticulated patterns grading into anastomosing structures; g–k, variably patterned cuticular fragments; g, PMU 39367/1 enlarged in (g1); h, PMU 39354/1 enlarged in (h1); i, PMU 39387/2; j, PMU 39364/1 enlarged in (j1); k, PMU 39334/1 showing parallel network of elongated pores; l, m, tubular microfossils; l, PMU 39338/1; m, PMU 39375/1; n, PMU 39349/1, graptolite fragment possibly sourced from Didymograptus murchisoni; o, PMU 39350/1, striped cuticular fragment possibly sourced from a wiwaxiid sclerite (see Harvey et al.49, fig. 3); p, PMU 39390/1, scolecodont; q, PMU 39349/2, unknown spine possibly sourced from scolecodonts; r–s, acritarchs; r, PMU 39360/1, sphaeromorph with granulose ornamentation enlarged in (r1); s, PMU 39359/1, Filisphaeridium sp. showing sharp solid processes enlarged in (s1); t–v, chitinozoans; t, PMU 39343/1; u, PMU 39351/1; v, PMU 39363/1 enlarged in (v1) and (v2), showing spinose ornamentation; w, PMU 39381/1, Leiosphaeridia sp. Scale bar equals 50 µm except m (100 µm) and enlargements in a2 (25 µm), a1, d1, d2, e1, f1, g1, h1, j1, r1, s1, v1, v2 (17 µm), b1 and c1 (10 µm).
