Editing Snowball Earth (section)

===First evidence for ancient glaciation===
Long before the idea of a global glaciation was first proposed, a series of discoveries occurred that accumulated evidence for ancient [[Precambrian]] glaciations. The first of these discoveries was published in 1871 by J. Thomson, who found ancient glacier-reworked material ([[tillite]]) in [[Islay]], Scotland.<ref name="Spencer1971">{{cite book | url=https://doi.org/10.1144/GSL.MEM.1971.006.01.01 | title=Late Precambrian Glaciation in Scotland | publisher=[[Geological Society of London]] | author=Spencer, A.M. | date=1971 | page=2| doi=10.1144/GSL.MEM.1971.006.01.01 }}</ref> Similar findings followed in Australia (1884) and India (1887). A fourth and very illustrative finding, which came to be known as "[[Reusch's Moraine]]," was reported by [[Hans Henrik Reusch|Hans Reusch]] in northern Norway in 1891. Many other findings followed, but their understanding was hampered by the rejection (at the time) of [[continental drift]].<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. |year=2011 |title=The Geological Record of Neoproterozoic Glaciations |chapter=A history of Neoproterozoic glacial geology, 1871–1997 |issue=36 |pages=17–37 |series=Geological Society, London, Memoirs|publisher=Geological Society of London}}</ref>