Fig. 1: Concretion formation process determined by studying Tusk-shell concretions28,29.
From: Post-earthquake rapid resealing of bedrock flow-paths by concretion-forming resin
a Tusk-shell (Fissidentalium spp.) concretion observed in the Yatsuo Formation of Toyama Prefecture, Japan. b Model of concretion formation and an equation that can be used to estimate the formation rate of a concretion. Conceptual view of the features of spheroidal concretions. Ca profile and porosity distribution across the spherical concretion formed under rather stable conditions under which solutes diffused continuously, causing calcite precipitation until the organic source of carbon at the center of the concretion was consumed26. Scale bar = 1 cm.
