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pre-Laurentian
pre-Laurentian adj. 
/ˌpriːlɔːˈrɛnʃn/, /ˌpriːləˈrɛnʃn/,
Brit. /ˌpriːlɒˈrɛnʃn/
, /ˌpriːlɒˈrɛnʃn//ˌpriːlɔːˈrɛnʃn//ˌpriːləˈrɛnʃn/U.S. /ˌpriˌlɔˈrɛn(t)ʃən/
/ˌpriˌlɔˈrɛn(t)ʃən/ΚΠ
1875 J. W. Dawson Nature & Bible 76 The Earth's crust thrown into folds, The first continents. Pre-Laurentian vegetation, known only inferentially.
1935 Science 22 Feb. 186/2 Do ordinary field studies give us even the basis for a poor guess that these schists are in reality Archean, in the sense of being pre-Laurentian?
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