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  1. Senior Member
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    turnover = upside down?


    Atmospheric Carbon Injection Linked to End-Triassic Mass Extinction

    Theend-Triassic mass extinction (~201.4million yearsago),marked by terrestrial ecosystem turnover and up to ~50% loss in marine biodiversity, has been attributed to intensified volcanic activity duringthebreak-upofPangaea.Here,wepresentcompound-specificcarbon-isotopedataoflong-chain n-alkanes derived from waxes ofland plants, showing a ~8.5 per mil negative excursion, coincident with the extinction interval. These data indicate strong carbon-13 depletion of the end-Triassic
    atmosphere,withinonly10,000to20,000years.Themagnit udeandrateofthiscarbon-cycle disruption 3 can be explained by the injection of at least ~12 10 gigatons of isotopically depleted carbon
    as methane into the atmosphere. Concurrent vegetation changes reflect strong warming and an
    carbonrelease and associated climate change.

  2. Barb_D's Avatar
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    Re: turnover = upside down?

    What in heaven's name happened to the formatting of that??

    OrshouldI ask-whatinheaven's-name happened tothefomatting??

    Turnover - replacement.
    When shift two comes in to work in factor and shift one goes home, that's the shift turnover.
    I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.

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