The northern margin of the Canning Basin exposes probably the best preserved Palaeozoic reef
        complex anywhere.  Twenty one regional Frasnian goniatite zones have been recognised and
        nineteen Lower to Middle Famennian zones and subzones.  These form the basis for reconstruc-
        tion of local sea-level curves and for international correlation to elucidate global eustatic effects.
        Frasnian transgressive intevals result in a slopeward spreading of basinal shales, the occur-
        rence of condensed cephalopod limestones, and reef backstepping.  Five hypoxic phases indi-
        cate high sea level stand of which one may represent the Genundewa Event interval.  Well-oxy-
        genated limestones with Timanites correspond to a short lived transgressive pulse on the Rus-
        sian Platform and in NW Canada which is named here the Timan Event.  The global mid-Frasnian
        eustatic rise led to a loss of anoxic facies.  Transgressive peaks are marked by limestones rich in
        beloceratids and large sized gephuroceratids intercaled in reef debris facies.  The well-known
        hypoxic Kellwasserkalk facies does not occur bot the mass extinction level is clear and associ-
        ated with a regression.
        Famennian sea-level rises led to sediment starvation, the formation of cyanobacterial reefs or to
        the deposition of goniatite limestones. Much of the lower Nehdenian, globally a highstand pe-
        riod, is strongly condensed.  During shallowing episodes corresponding to the international
        Condroz Event, thick wedges of reef detritus were shed downslope.  The basal upper Nehdenian
        shows a significant sea-level rise and there is a subsequent regressive trend which is shown in
        the diachronous Bugle Gap Formation and in the Piker Hills Formation.  The global hypoxic
        Annulata Event is represenied and reverses the shallowing trend for a brief interval.  Upper
        Famennian shallowing and siliciclastic input terminated reef growth in the area.