In　this　study,　we　report　a　tuned　astronomical　time　scale　for　a　sedimentary　formation　in　Early　Cretaceous　-　the　lower　Linze　Section　located　in　the　Zhangye　Basin　of　the　central　Hexi　Corridor,　northwestern　China.　Based　on　detailed　field　investigations,　we　identified　this　sediment　as　the　Xiagou　Formation,　which　is　widely　distributed　in　the　region.　A　thick,　prominent　limestone　layer　crops　out　in　the　middle　portion　of　the　Linze　Section,　and　can　be　correlated　to　a　similar　limestone　layer　in　the　Liupanshan　Group,　which　has　been　dated　via　high-resolution　magnetostratigraphy.　This　correlation　places　an　age　constraint　of　around　114　Ma　for　the　top　of　the　underlying　strata.　A　total　of　1245　samples　were　collected　from　the　474-m-thick　lower　Linze　Section,　for　magnetic　susceptibility　measurements　and　cyclostratigraphic　analysis.　Spectral　and　continuous　wavelet　analyses　were　applied　to　the　low-frequency　magnetic　susceptibility　series　and　the　percentage　frequency-dependent　magnetic　susceptibility　series,　as　well　as　to　specific　subsections　exhibiting　visible　rhythmic　bedding.　A　hierarchy　of　sedimentary　cycles　was　identified,　with　wavelengths　of　21.5-37.0　m,　7.5-9.5　m,　2.1-4.4　m,　and　1.4-1.7　m.　The　ratios　between　these　lengths　correspond　well　to　the　ratios　between　the　durations　of　Earth＇s　orbital　long-eccentricity,　short-eccentricity,　obliquity,　and　precession　cycles.　We　interpret　these　sedimentary　cycles　to　reflect　the　effects　of　orbital　forcing　on　sedimentary　processes.　Using　band-pass　filtering　to　specifically　extract　eccentricity　cycles,　we　established　a　tuned　astronomical　time　scale　for　the　Xiagou　Formation　in.　the　lower　Linze　Section,　with　a　total　duration　of　about　6.1　Myr　(-114.1　Ma　to　120.2　Ma).　Based　on　this　time　scale,　the　sedimentation　rate　of　the　Xiagou　Formation　is　estimated　to　be　in　the　range　of　62-105　m/Myr,　with　most　intervals　yielding　rates　in　the　70-80　m/Myr　range.　(C)　2017　Published　by　Elsevier　B.V.