Are there any volcanoes in North Dakota?

There are no active volcanoes in North Dakota. However, there are a number of extinct volcanoes in the state. These volcanoes were active during the Cretaceous Period, which lasted from 145 to 66 million years ago. The most well-known of these extinct volcanoes is the Turtle Mountains, which is located in the north-central part of the state. The Turtle Mountains are a series of buttes that were formed by the eruption of a volcano. The buttes are made up of a type of rock called trachyte, which is a type of igneous rock that is formed when lava cools quickly.