During the construction of the new building for our school campus in northern Taiwan, several pieces of buried wood were found from the same sedimentary layer, about 10 meters below ground surface. The question was aroused by what mechanism that made the fossil woods buried at the same time at this location. To answer this question, we conducted a comprehensive analysis of the sediments in core sections collected during construction. Radiocarbon dating was also applied on buried woods in order to pin down the time frame. The result shows that the age of buried wood is from 5200 to 3400 before present, and the level of degradation in buried woods is consistent with the age. The characteristics of larger grain size and lighter color of the sediment in the same layer of the buried woods also indicates a higher level of transportation energy in river system. In addition, the pollen analysis of Taiwan also implied a high frequency of Typhoon events between 2930 and 2020 before present. Therefore, we proposed that the coexistence of buried wood samples from different temporal origins within a single layer represents an extreme hydrological event, rather than progressive depositional accumulation. Our findings correspond well with regional pollen-based reconstructions of Holocene climatic variability, which suggest intensified typhoon activity during this period in Taiwan. In conclude, our result, supported by previous study, allows us to look back into the paleoclimate in northern Taiwan through a small window from unexpected but valuable tools, buried woods and sediments.