Fig. 2: Examples of macrobioerosion in the Bago River, Myanmar.
From: Bioerosion of siliceous rocks driven by rock-boring freshwater insects
a Right shore with continuous siltstone outcrop at the middle reaches of the river. The red arrows show the location of submerged rocks with bioerosion traces. b Submerged part of the siltstone rock outcrop (indicated by the red arrows) at the middle reaches of the river. c Emerged siltstone rocks with bioerosion traces (indicated by the red arrows) at the upper reaches of the river. d Close-up view of siltstone outcrop with multiple bioerosion traces at the upstream section of the river. e Siltstone fragment densely covered by sub-recent bioerosion traces from the upper reaches of the river (plan view). The yellow arrows show crusts of a freshwater sponge species. f Siltstone surface with a dense network of sub-recent bioerosion traces from the upper reaches of the river (plan view). The blue arrows show the macroborings filled with clay. The green arrow shows a pea clam in a bioerosion groove (Bivalvia: Sphaeriidae). Scale bars = 10 mm (e, f). (Photos: Mikhail Y. Gofarov [a–b] and Ilya V. Vikhrev [c–f]).
