Chi, W.-R.(1979) Calcareous nannoplankton biostratigraphy of the Nantou area, central Taiwan. Petroleum Geology of Taiwan, 16, 131-165. 纪文荣(1979)台湾中部南投区之超微体生物地层研究与对比。台湾石油地质，第16号，第131-165页。
The lower lithofacies consists of tabular sandstone interbedded with mudstone that contains abundant foraminifera and nannoplankton microfossils. 根据最近的古生物研究，卓兰层的顶部可能已进入更新世(见第五表)。
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Huang, T.-C.(1977) Calcareous nannoplankton stratigraphy of the upper Wulai Group (Oligocene) in northern Taiwan. Petroleum Geology of Taiwan, 14, 147-179. 黄廷章(1977)台湾北部上部乌来群（渐新世）超微化石生物地层学研究。台湾石油地质，第14号，第147-179页。
Chang, Stanley and Chi, W.-R. (1983) Neogene nannoplankton biostratigraphy in Taiwan and the tectonic implications. Petroleum Geology of Taiwan, 19, 93-147. 张锡龄、纪文荣(1983)台湾新第三纪超微化石生物地层与地质构造之意义。台湾石油地质，第19号，第93-147页。
