Precambrian
This type of rock formed from cooled magma
Igneous Rock
At some point North Dakota was completely covered by this liquid
Water
The Mesozoic Era has been called the age of this prehistoric reptile
Dinosaurs
Under this period, reptiles, mammals, insects, and plants became more common
Tertiary Period
This part of North Dakota was NOT covered by the giant glacier
Southwestern ND
This graphic helps geologists keep track of geological eras of the earth's history
Geological Time Table
After land appeared, vegetation and this type of rock was formed
Sedimentary Rock
This fish type reptile creature dominated the waters of North Dakota for many years
Mosasaur
Under this period, a global cooling took place in many places on the earth, including North Dakota
Quaternary Period
Wind and water and shifts in the plate tectonics helped form overtime this great landscape of ND
The Badlands
Rocks
The formation of sedimentary rocks led to the formation of this Basin
Williston Basin
The estimated most common dinosaur in North Dakota was this shield headed and horned dinosaur
Triceratops
This coal formed under intense pressure underground
Lignite Coal
Melted glacier water formed this lake
Lake Agassiz
The approximate age of how old Geologists think the earth is
4.5 Billion Years
Insect, fish, and other small animals decomposed under a natural protective substance that eventually became this piece of underground sea and soil
Fossils
This dinosaur was a carnivore and fierce predator
Tyrannosaurus Rex
This icy period dominated most of the earth including North Dakota
The Ice Age
The study of geology ensures better knowledge of this entity
Land
These type of scientist specialize in studying the earth
Geologists
As time went on and the grounds of the earth shifted under pressure, some fossils formed this substance still used in North Dakota today
Oil
This ancient alligator type dinosaur dominated North Dakota
Champsosaur
The last glacier that was over North Dakota was this large glacier
Wisconsinan Glacier
We study this science to ensure why land was formed and shaped the way it was
Geology