本研究與台灣石油公司合作，取得粗坑一號井13個岩心及125個岩屑標本，重新建立粗坑一號井地層層序，希望可以加以釐清在粗坑背斜因凝灰岩及始新世大型有孔蟲Discocyclina引起的層序爭議。
根據在粗坑背斜地表地質研究及粗坑一號井的研究得到下列幾點結果：
一、 根據生物型態及參數測量與Less(2008)地中海地區始新世大型有孔蟲Discocyclina對照後，認為粗坑始新世大型有孔蟲Discocyclina為D. dispansa ex. interc. Sella，為晚中始新世化石。且由埋藏學的觀點，認為粗坑大型有孔蟲Discocyclin化石為原地堆積。
二、 覆蓋在粗坑新世大型有孔蟲Discocyclina化石的砂頁互層，含Globorotalia bullbrooki Bolli、Globorotalia spinulosa Cushman等始新世化石，地層年代約晚中始新世。
三、 由化石內容、岩石組成及地表地質認為粗坑一號井井下0到-350 m為斷層帶；-350 m到-500 m為早中新世碳寮地層；-500 m到-864 m為晚漸新世木山層、-864 m到-1300m為晚漸新世五指山層、-1300m到-1740m始新世中寮層。-1740 m為雙冬斷層，之下為更新世頭嵙山層。
四、 粗坑一號井研究結果與Huang(2008，2009)一致，皆存在一早漸新世到晚始新世不整合面。平林凝灰岩及中寮層含許多來自北港高區的白堊紀到早始新世二次堆積鈣質超微化石，顯示粗坑地區過去為北港高區旁的小張裂盆地。

關鍵字：始新世、平林凝灰岩、大型有孔蟲、粗坑背斜

Foraminiferal stratigraphy of CPC Well TSK-1 and the surface geology in the vicinity, Western Foothills, central Taiwan

Dia Jia Ho
Chi Yue Huang
Abstract
In this study, we gained the 13 core samples and the 125 drilling cutting samples of Well TSK-1 from CPC, and restructured the stratigraphic sequence of Well TSK-1 to clear the argument on the stratigraphic sequence of the Tsukeng anticline.
From the surface geological studying and the Eocene foraminifera Discocyclina exposed on Tsukeng surface and the samples of Well TSK-1, we got the several following results:
1、 By the morphometric measurement of the Eocene foraminifera Discocyclina fossils in Tsukeng area, this study refers to the Eocene Discocyclina in the Mediterranean area (Less, 2008), and assumes its age is late Mid-Eocene. In the view of Taphonomy, we believe the the Eocene foraminifera Discocyclina fossils are in-situ.
2、 The bedding above the Eocene foraminifera Discocyclina fossils containing the Eocene foraminifera , such as Globorotalia bullbrooki Bolli、Globorotalia spinulosa Cushman et al., is late Middle Eocene.
3、 Base on the fossils and the petrographic compositions of the Well TSK-1, we believes that there is a fault zone between 0 m to -350 m；the early Miocene Taliao Formation is between -350 m to -500 m；the late Oligocene Mushan Formation is between -500 m to -864 m； the late Oligocene Wuchihshan Formation is between -864 m to -1300 m； the formation between -1300 m to -1740 m is t the Eocene Chungliao Formation。The depth of -1740 m is Shuangtung fault, the formation under Shuangtung fault is Toukoshan Formation.
4、 The studying results of the TSK Well-1 as the same as the results of Huang et al. (2008，2009) are that there is a unconformity from Early Oligocene to Late Eocene. The Pinglin Tuff and the Chungliao Formation contain many reworking calcareous Nannoplanton fossils from Cretaceous to early Eocene, it represents that the Tsukeng area was a rifting basin near the Paikeng basement high in the past.

Key Words: Eocene、Pinglin Tuff、Large foraminifera、Tsukeng anticline

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