Castellation Incorporating Geology and Geography: Tenth–Sixteenth Century Castles on Chert of a Jurassic Accretionary Complex in Central Japan
Tóm tắt
Human activity, such as castellation for military affairs, is closely related to geology and geography. To determine the relationships between rock and castle distributions, this study plotted 29 castles on a geological map in the Kiryu and Ashikaga District of central Japan. Twenty-four castles were located on the region’s Jurassic accretionary complex. In particular, 13 castles, including Ashikaga, Omata, and Ono castles, were built on chert of the Jurassic accretionary complex. Two other castles, namely Kiryu and Takatsudo castles, are not located within chert distribution, but exposed chert is visible around the main fortifications of these castles. Because chert is harder than other rocks and forms precipitous land, castle builders appeared to have utilized these geological and geographical characteristics to enhance defense. We suggest that Japanese castles have potential as geoheritage that connects history, geology, and geography.
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