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1891 in science
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==Geology== *[[Hans Reusch]] describes what comes to be known as [[Reusch's Moraine]] in northern Norway; [[tillite]] from a [[timeline of glaciation|Precambrian glaciation]].<ref name=Hoffman2011>{{cite book |last1=Hoffman |first1=Paul F.|author-link=Paul F. Hoffman|editor-last=Arnaud|editor-first=E. |editor-last2=Halverson|editor-first2=G.P.|editor-last3=Shields-Zhou|editor-first3=G. |date=2011 |title=The Geological Record of Neoproterozoic Glaciations |chapter=A history of Neoproterozoic glacial geology, 1871β 1997 |issue=36 |pages=17β37 |series=Geological Society, London, Memoirs|publisher=Geological Society of London}}</ref>
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