Stone stupa - Itaishitoba

...A type of stone tower from the Middle Ages. Also called a "Itseki Toba." The first known example was a stone tower from 1227 in Konan-machi, Osato-gun, Saitama Prefecture. They were made in large numbers during the Nanboku-cho and Muromachi periods, but disappeared in the early 17th century.

*Some of the terminology used in reference to "slate stone stupas" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…中世の石塔の一種。板石塔婆ともいう。埼玉県大里郡江南町にある嘉禄3年(1227)のものが初見で，南北朝･室町時代に盛んに作られ，17世紀初頭に姿を消す。…

※「板石塔婆」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報