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1 landrek lagt s um sinn umran lognaist t af vi frfall

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Unformatted text preview: s ● Sams konar steingervingar hafa fundist í fjarlægum og aðskildum löndum ● ● ● ● ● ● ● ● ● Mesosaurus – ferskvatns eðla Glossopteris – jurt sem lifði nærri pólsvæðum Jarðar Lystrosaurus – ósynd landeðla Cynognathus – ósynd landeðla Þessar lífverur gátu ekki farið yfir úthöfin 1 11 Jarðlög frá Prekambríum ● Sams konar jarðfræðileg fyrirbæri beggja vegna Atlantshafs ● ● ● ● ● ● Jarðfræðilegt byggingarlag Berggerðir og aldur þeirra Fellingafjöll ● Appalachian og Caledonian 12 Mótbárur andstæðinganna ● ● Hvers vegna var andstaða við kenningu Wegeners? Gangverk sem gat fært meginlöndin úr stað var ekki þekkt ● ● ● Wegener stakk upp á að meginlömdin plægðu úthafsbotnana líkt og skip klýfur hafflötinn Hann nefndi líka snúning Jarðar og miðflóttakrafta Þessar skýringar dugðu ekki og kenningunni var hafnað! 1 Landrek „lagt á ís um sinn“ ● ● Umræðan lognaðist út af við fráfall Wegeners Fáeinir mæltu þó áfram fyrir hugmyndum Wegeners ● ● ● 13 Arthur Holmes – að möttulefnin hreyfust við hringstreymi Gögn úr bergsegulmælingum hleyptu seinna nýju lífi í umræðu um landrekskenningu Alfred Wegeners Sir Arthur Holmes (1890-1965), breskur jar...
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