本文综述北部湾东北部R_1孔岩心记录。
R1 core is located in the northeastern part of the Beibu Gulf.
沉积物岩心主要记录的是沉淀在海底沉积物，一层又一层，记录它们沉淀时的海洋系统状况。
Sediment cores are essentially a record of sediments that settled at the sea floor, layer by layer, and they record the conditions of the ocean system during the time they settled.
所展示的证据来源广泛，从岩心钻探到在伊斯坦布尔和意大利的国家档案馆新发现的中世纪财政记录。
The evidence comes from everything from core drilling to medieval financial records newly uncovered from state archives in Istanbul and Italy.
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