See that white line on the mountain? That’s part of the Champlain Thrust, a line that runs along the entire Eastern side of the Champlain Valley where older Cambrian quartzites overrode the younger Ordovician shales during one of the messy collision events that built the eastern seaboard of North America—here visible as snow-covered cliffs and steep slopes formed by the faster erosion of the shale underlying the quartzite.
#1 Cryptolithus Fan
- ordovician limeshale she/they
Mais il n'y a rien là pour la Science. Editor, New York Review of Wasps.
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