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Bell's (1938) macrofloral biostratigraphy (three floristic zones of Westphalian C and D ages) of the Sydney Coalfield is fundamentally revised. The revision is based mainly on two lines of evidence: (1) newly collected macrofloras (sphenophylls, odontopterids, pecoplerids) by the present author and K. McCandlish since 1974 from the upper part of the Sydney Coalfield in the Point Aconi area, and (2) extension of ranges for some of Bell's records, especially S. cuneifolium and Linopteris oblique . As interpretative results, the age of the Sydney Coalfield is considered to be Westphalian C to Cantabrian (earliest Stephanian), with the two recognized macrofloristic zones ( Lonchopteris eschweileriana and L. oblique zones) of Westphalian C, and Westphalian D and Cantabrian ages, respectively. Key words: macrofloral biostratigraphy revision, Westphalian C-Cantabrian, Sydney Coalfield, Canada.   RESUME  La biostratigraphie macrofloristique du Bassin houiller de Sydney, telle qu'eablie par Bell en 1938 (trois zones floristiques d'âges westphaliens C et D), fait l'objetd'une profonde revision qui se jusdfie surtout (l)par de nouveIles recoltes de macroflore (sphenophyllees, odontopteridees, pecopteridees) realises depuis 1974 par l'auteur et K. McCandlish dans la partie superieure de ce bassin (region de Point Aconi), ainsi que (2) par relargissement de l'extension d'une portion des taxons recenses par Bell, notamment S. cunefolium et Linopieris oblique . Suite a cette inteipretalion,on considere que l’âge du Bassin houiller de Sydney s'echelonne du Westphalien B au Cantabrien (debut du Stephanien). De plus, on y reconnait deux zones macrofloristiques, soil la Zone a Lonchopteris eschweileriana et la Zone a L. oblique , respectivement d'âges westphalien C et westphalien D â cantabrien. Mots-cles: biostratigraphie macrofloristique, revision, Westphalien C a Cantabrien, Bassin houiller de Sydney, Canada.  [Traduit par le journal]

Summary of macrofloral biostratigraphy of Sydney Coalfield, Nova Scotia, Canada (Carboniferous, Westphalian/Cantabrian age)