Concretion Growth-Rate Diagram (IMAGE) Nagoya University Caption This diagram can be applied to all kinds of spherical concretions formed in marine sedimentary rocks. Credit Hidekazu Yoshida Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.