by The American Geosciences Institute Friday, September 28, 2018
This colorfully named site is found on the shores of a gulf on the west coast of a Canadian island province, within a national park designated as a UNESCO World Heritage Site.
The 60-meter-thick rock sequence formed at the end of the Cambrian and the beginning of the Ordovician when turbidites emplaced layers of limestone at the base of deep-sea slope in the Iapetus Ocean. The limestone layers were then sandwiched between thin layers of shale.
The International Union of Geological Sciences has designated this geologic site a Global Stratotype Section and Point for the Cambro-Ordovician boundary.
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Answer: The Green Point Geological Site in Gros Morne National Park in Newfoundland, Canada, features a 60-meter-thick sequence formed when turbidites emplaced layers of limestone at the base of a deep-sea slope in the Iapetus Ocean, which were then sandwiched between paper-thin layers of shale. Photo is by Heather McArdle.
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