由於歐亞板塊與呂宋島弧的斜碰撞作用，造山帶由北往南逐漸發育形成，因此在台灣西半部與其位置相對應的前陸盆地由北往南依序代表前陸盆地發育後期到早期的各階段。台灣西南部內麓山帶(崙後斷層以東至竹頭崎斷層以西之間)的地層相當於前陸盆地中心到近端的沉積層序。本研究根據野外地質的描述以及地下地質資料分析，探討玉井向斜東側至西側地層側向的岩性變化以及沉積環境的水深變化，以解釋各地層的古沉積環境以及其所代表的地體構造演化的含意，並嘗試建立前陸盆地中心到近端的構造地層層序。
本研究區域所包含早上新世-早更新世的地層根據岩石地層單位劃分為隘寮腳層、茅埔頁岩、竹頭崎層、北寮頁岩、鏡面砂岩、玉井頁岩。根據岩體特徵可以分出2個泥岩相，5個砂岩相以及1個礫岩相，並根據岩相組合得知本研究區域沉積環境為遠濱過渡帶、遠濱和濱面。
地層架構分析發現在NN13~NN15時期盆地東邊鄰近造山帶的近端處沉積物所堆積的厚度遠大於盆地西邊的區域，代表當時盆地的容積空間由西向東逐漸增厚，指示此一時期可能為盆地東側造山帶的活動期，造山帶的荷重造成鄰近造山帶的盆地近端形成的容積空間大於盆地中心。之後，本研究區域進入構造相對靜止期。綜合盆地側向岩性分布圖以及野外所觀察古水道方向的結果，本研究區域沉積物主要來自盆地東側的造山帶和北邊開始抬升的盆地，其散佈方向與野外所觀測到的水流方向相同。盆地北邊會成為沉積物來源區可能肇因於造山帶的抬升作用。
綜合以上結果，本研究區域可視為造山帶的體積達到穩定時中心到近端的地層層序，相當於前淵沉積帶的區域。

Because of the oblique collusion of Asian continent with the Luzon volcanic, the orogenic belt has developed progressively from the north to the south. The Pliocene-Pleistocene strata of the Inner Foothills in SW Taiwan are equivalent to the sedimentary sequences of foreland basin from the basin center to proximal area. According to field investigation and well logs analysis, this study we propose to recover the changes of lateral lithology and of the water depths from the eastern flank to the western flank of the Yuchin Syncline, to interpret sedimentary environments of the strata and their roles in the foreland basin evolutionary history, and to construct the tectonostratigraphy of the sequences between the Lunhou Fault and the Chutouchi Fault.
The early Pliocene to early Pleistocene strata can be divided into six lithological units: the Ailiaochiao Fm., the Maopu Shale, the Chutouchi Fm., the Peiliao Shale, the Chingmien Sandstone and the Yuching Shale. We recognized eight lithofacies among these formations, and reconstructed their sedimentary environments (offshore, offshore transition and shore- face) by lithofacies association.
The stratigraphic architecture analysis reveals that the thickness of accumulated sediments is thicker in the eastern part than the western part of the basin in NN13~NN15 period. It indicates that the accumulation space increased from the west to the east. The phenomenon indicates that tectonic activities arose in this period. The accommodation space, caused by orogenic loads, decrease away from the orogenic belt. The tectonic activities of the study area were quiescent later.
Combining the lateral lithologic variation and the direction of channels in the field, the sediments derived from the eastward orogenic belt and the uplifted northern part of the basin. The sedimentary dispersal direction are similar the directions observed in the channels. The later one becomes one of the source areas due to the orogenic belt.
This study concludes that when the orogenic belt had reached a steady state, the sequences of the study area deposited in the foredeep zone within the central to proximal part of foreland basin.

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