Sedimentary　rocks　from　the　Ediacaran–Cambrian　boundary　record　important　biological,　climatic　and　geotectonic　changes　during　this　time.　To　date,　only　few　geochemical　investigations　on　the　upper　Ediacaran　–　upper　Cambrian　rocks　in　the　Tarim　Basin　have　been　carried　out.　Here,　we　report　high-resolution　δ　13　C　carb　records　from　the　Penglaiba,　the　Wushi　phosphorite　and　the　Dongergou　sections　from　Ediacaran–Cambrian　Series　3　in　the　Keping　area　of　the　Tarim　Basin.　The　sections　display　several　obvious　δ　13　C　carb　shifts;　δ　13　C　carb　values　increased　from　3‰　to　6.7‰　across　the　Qigebulage　Formation.　Moreover,　a　negative　δ　13　C　carb　shift　across　the　Ediacaran–Cambrian　boundary　is　apparent;　δ　13　C　carb　values　decreased　to　a　minimum　of　−9.8‰　in　the　Wushi　phosphorite　section　(−7.7‰　in　Dongergou　section　and　−5.4‰　in　Penglaiba　section),　followed　by　a　positive　carbonate　carbon　isotopic　excursion　across　the　Yuertusi　Formation　into　the　middle　of　the　overlying　Xiaoerbulak　Formation.　Furthermore,　more　or　less　invariable　positive　δ　13　C　carb　values　characterize　the　middle　and　upper　Xiaoerbulak　Formation.　The　most　negative　δ　13　C　carb　value　(−14.3‰)　occurred　near　the　base　of　the　Shayilik　Formation,　which　is　the　absolute　minimum　value　among　the　studied　sections　of　the　Cambrian　Series　2　to　Cambrian　Series　3　transition　in　the　world.　The　δ　13　C　data　from　Keping,　Tarim　Basin　are　in　good　agreement　with　carbon　isotope　profiles　recorded　in　South　China,　and　these　events　may　reflect　the　perturbation　of　the　carbon　cycle　in　the　Tarim　Basin　during　the　Ediacaran–Cambrian　and　the　Cambrian　Series　2　–　Cambrian　Series　3　transitions.　Copyright　©　Cambridge　University　Press　2017