My main research interest is when and how cyanobacteria and eukaryotes evolved. I am investigating this problem by studying the geological record. I have discovered morphologically diverse "large" microfossils from the ca. 3.0 Ga Farrel Quartzite and the ca. 3.4 Ga Strelley Pool Formation in the Pilbara Craton, Western Australia. In order to reveal their biological affinity, I have been taking various approaches in collaboration with geobiologists in various institutions, including trace element geochemistry of host cherts, in situ carbon isotopic analyses, SEM, TEM, etc. However, my favorite approach is to watch the microfossils under the petrographic microscope and to hear carefully what they are talking to me.
For publications, please visit to http://www.info.human.nagoya-u.ac.jp/~sugi/Site/Publication.html.