the building stone is tuffaceus sandstone , which contains a lot of fossils of shells that are produced in this region . 石材は凝灰岩砂岩で、この地方で産出される貝の化石を多量に含んだものである。
it seems that part of sakefuneishi was chipped away to use for building stone walls when takatori-jo castle was being constructed . 高取城を築く際に、石垣用の石材として利用しようとしたためとみられる。
when sai is used as a unit for weighing a load of a ship or a building stone , 1 sai is deemed to have the cubic volume of 1 shaku on a side (1 shaku is about 30 .3 centimeters ). 船の積み荷や石材を量る場合には一辺1尺の立方体の体積（1立方尺）を指す。
nobori-ishigaki was a method of building stone walls adopted to fortify the defense of japanese castles that were constructed on the korean peninsula during hideyoshi toyotomi ' s bunroku-keicho war . 登り石垣（のぼりいしがき）は、豊臣秀吉の文禄・慶長の役の際、朝鮮半島の倭城の防備を固めるために採られた石垣普請の手法である。
in those days , empress saimei carried on many construction projects such as building stone mounds and a takadono (a building placed on the high place ) near the top of mt . tonomine and digging a waterway through the nara basin , but these constructions were received unfavorably by the people who were mobilized . 当時、斉明天皇は多武峰の山頂付近に石塁や高殿を築いたり、奈良盆地に運河を掘るなど、多くの土木事業を営んだが、動員される民衆には非常に不評であった。
