The cut plane is at Quantou town of Changtu county in Tiding City of Liaoning Province, which areal structure is belong to the southeast uplift area of Songliao Basin. The sedimentary environment is drought-semi arid. The Lower Cretaceous Quantou formation layer of this cut plane is parallel unconformable contact with Lower Cretaceous Tuhulu formation at the bottom, which the total thickness is 510. 84 m. According to the accurate investigation and combination the region geologic information the Lower Cretaceous Quantou formation has settled a suit of coarse grained detrital rock of terrigenous origin. The sedimentary facies evolutionary regular pattern of the layer was: alluvial fan facies ->braided stream facies-> meandering stream facies, base on the research of alluvial fan facies, braided stream facies and meandering stream facies we had divide 7 types of sub-sedimentary facies and 12 types of micro-sedimentary facies in further.%本剖面地处辽宁省铁岭市昌图县泉头镇境内,区域构造属松辽盆地东南隆起区,沉积环境为干旱-半干旱.剖面出露的泉头组地层厚度共510.84 m,其底部与吐呼噜组灰白色凝灰岩呈平行不整合接触.通过对剖面地层的细致考察并结合区域地质资料,剖面泉头组地层沉积了一套粒度较粗的陆源碎屑岩.地层沉积相演化规律为:冲积扇相→辫状河相→曲流河相,并在此基础上识别出7种沉积亚相和12种沉积微相.
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