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State one tectonic event affecting North America that occurred the same time as the palisade sill intrusion

User Bohao LI
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There are many tectonic events happened affecting the North America that occurs during the palisade sill intrusion. One of these is the rifting of North America. This event is called Midcontinent Rift System. It occurs in the center of North American continent. 
User Jjpp
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