Stone tools were created and used for daily life during the prehistoric periods. Excavated stone tools and flakes are joined together to recreate the mother rock and are referred to as a joining material. When describing joining materials in excavation investigation reports, actual measurement maps are created, or plots are drawn based on 3D measurement point clouds. However, surface point clouds of joining materials acquired bylaser measurement are not sufficient for the investigation and research of the joining materials, and the internal information of the joining material is also required. To generate complete joining materials, it is necessary to match the measured surface point clouds obtained by measuring the joining materials with the point clouds of the stone tools that comprise the joining material. However, some stone tools within a surface point cloud obtained by measuring the joining material are partially hidden by other stone tools. Therefore, the method matching the surface of the joining material with that of the stone tools needs to focus on the partial shape of the stone tools. In this paper, we propose a new method for partial matching between surface point clouds obtained by measuring joining materials and point clouds representing peeled surfaces of the stone tools. Our method can reconstruct the spatial arrangement of the stone tools that compose the joining material from the surface point cloud of the joining material and the measured point clouds of the stone tools.

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