二億年のチャートを洗ふ秋の潮

The autumn tide breaks
on ancient chert that spans
two hundred million years.






におくねんのチャートをあらふあきのしお

*Chert is a geological term referring to a family of rocks including flint.
These rocks are notable for their ability to preserve fossils.

尾池和夫（おいけかずお）