Correction

The original published version of this article (Iryu 2014) did not include details of Professor Yasufumi Iryu’s affiliation with the JpGU (Japan Geoscience Union). The full author affiliation details are as follows:

  1. 1.

    JpGU (Japan Geoscience Union), 2-4-16 Yayoi, Bunkyo-ku, Tokyo 113–0032, Japan

  2. 2.

    Institute of Geology and Paleontology, Graduate School of Science, Tohoku University, Aobayama, Sendai 980–8578, Japan.