No starch granules

I've got this book just today. I observed 7 stone tools excavated from this site, but no starch granules were found.

Shibutani, A. 2014. Starch residue analysis of stone tools excavated from the Kamikuroiwa No. 2 rockshelter. The Kamikuroiwa No. 2 rockshelter: Excavation report from 2010 to 2011 (Archaeology, Faculty of Letters of Chuo University ed.). 34-35. Archaeology, Faculty of Letters, Chuo University and Kumakogen-cho Educational Board, Kumakogen-cho, Ehime.