A Study on the Two-stage Excavation Coffin Platforms of the Ancient Tombs in Geumgwan Gaya Area in the 4th and 6th Centuries

This paper examines the purpose, change pattern, and nature of the two-stage excavation light transfusion, which was intentionally excavated at a certain depth in the shape of a slender rectangle on a plane, on the bottom surface of the tomb found in Gogimhae Bay, present-day Busan, and Gijang. Various views have been presented, including opinions that identify the two-stage excavation as a kind of ritual transfusion that is used to evenly lay the podium or to destroy it. Among the ancient tombs in Gimhae Bay, I paid attention to the facilities excavated heretically in the burial space of the dead in Yangdong-ri, an early central group before the rise of the group in Daesung-dong. The main feature is a structure that is excavated at a certain depth on a cross-section “⊔” or “∪” in the form of an elongated square plane, and small halite and high-rise stones are regularly installed inside. In addition, we studied the origin and characteristics of the facility, noting that the bent iron and coffin used for binding wood pipes were excavated inside the grave pit. According to Kim Doo-cheol's(2010) study of the Coffin Platform(棺床), a wooden coffin pedestal, among the seedlings of Early Gaya, the Coffin Platform of Yangdong-ri's ancient tombs shows the coexistence of the Recessed floor of a coffin(凹床) and the Daeseong-dong-type the Flat floor of a coffin(平床) in the process of exchange with the external group (Bokcheon-dong). In the case of Yangdong-ri, it is rarely used as an accessory facility for the upper-class tombstones in the center of the hill. Since then, it is believed that the early type of two-stage drilling structure has been built in the middle of the fourth century, starting with the construction of the two-stage drilling structure in the four-sided and distal-shaped wooden tomb(A2a-style, 394) in the middle of the fourth century, and it is believed that it will be built inside the transitional stone tomb of the early 5th century. As a result of examining the changes and characteristics of the type, the two-stage excavation in the Geumgwan Gaya area is identified as a type of ornamental contrasted by a combination of urinary facilities and separate attached blood transfusions for the rest of woodwinds in Yangdong-ri Ancient Tombs and small and medium-sized ancient tombs in the Jomang River basin in the late 4th and early 5th centuries. The two-level refracting light on the cross-section ‘∪’ is contrasted for the laying of a log-shaped log wood pipe, and the two-level refracting light on the cross-section ‘⊔’ is differentiated by type in terms of size, facilities, quality, and quantity of burial products. In other words, it is presumed that the use of the middle class within the small and medium-sized group in the former and the lower class in the latter. In the mid-to-late 5th century, the two-level refracting light pipe flowed into Changwon and Masan, which were exchanges with the late Gimhae Bay Small and Medium-Sized Ancient Tombs, and was contrasted on a small scale, but it declined and disappeared with the introduction of the stone chamber. The two-stage excavation Coffin Platform is a line of the electrical Gaya physiognomy, and it is difficult to see it as a vague “friendly group” or a “class group according to hierarchies within the group” as the grave of small and medium-sized ancient tombs in the Geumgwan Gaya area of Gaya in the late 5th century. In other words, there is no significant difference in the size and quantity of wooden coffin, wooden coffin, stone coffin tomb, and burial relics in two-stage cave mines, and the clustered pattern that forms a specific graveyard. Although the visualization of the relative hierarchy between each tomb is not clear, it is understood as a Heterarchy Group(comprehensive cross-sectional group) grave system that can be ranked in various ways (local colors).