The　Hongguleleng　Formation　in　western　Junggar,　northwest　China　preserves　a　rich　variety　of　fossils　and　was　previously　regarded　as　a　＇refugium＇　during　the　Late　Devonian　biotic　crisis.　Uncertainty　in　the　age　of　the　Hongguleleng　Formation　has　persisted　for　a　considerable　time.　In　this　study,　cyclostratigraphic　analysis　was　carried　out　on　the　Upper　Devonian　Bulongguoer　and　Wulankeshun　sections　from　western　Junggar,　northwest　China.　Time　series　analysis　and　modeling　of　iron　(Fe)　concentration　proxy　data　reveal　variations　with　frequencies　comparable　to　those　of　the　Earth＇s　long　and　short　orbital　eccentricity,　obliquity,　and　precession　index　in　both　successions.　Interpreted　405-kyr　long　orbital　eccentricity　cycles　were　used　to　establish　floating　astronomical　time　scales　(FATs)　for　the　two　successions.　From　these　FATs　the　depositional　duration　of　the　Hongguleleng　Formation　is　calculated　as　11.5　±　0.58　Myr.　The　Devonian-Carboniferous　boundary　age　of　359.3　±　0.3　Ma　was　chosen　as　a　time　＇anchor＇,　resulting　in　an　astronomically　determined　age　of　370.2　±　0.66　Ma　for　the　base　of　the　Hongguleleng　Formation.　Combined　with　conodont　biostratigraphy,　this　age　indicates　that　the　Hongguleleng　Formation　in　western　Junggar　does　not　reach　down　to　the　Frasnian-Famennian　boundary.　Sedimentary　noise　modeling　of　the　reconstructed　Fe　concentration　time　series　provides　an　interpretation　of　sea-level　variations　in　the　Paleo-Asian　Ocean　controlled　by　astronomical　forcing　from　very　long　orbital　eccentricity　cycles　(g4–g3)　throughout　the　Late　Devonian　period.　Intensified　monsoonal　climates　during　these　orbital　eccentricity　cycle　maxima　led　to　elevated　terrigenous　input　and　strengthened　upwelling,　which　enhanced　primary　productivity　in　the　western　Junggar.　We　propose　an　＇astronomical　climate　change＇　model　as　a　driving　mechanism　that　led　to　biotic　recovery　in　the　Famennian　Hongguleleng　Formation.　©　2024