I need to write a brief description of each. I am also having a hard time finding examples of each and why they are important to geological knowledge.
3. Ediacaran faunas
4. Grenville Orogeny
7. Permian/Triassic Mass Extention
8. Terminal Cretaceuos Extinction
Laurentia, or the North American craton, forms the largest part of the continent we call North America. The geographic continents are sometimes different from geological continents. Each tectonic continent may be an amalgamation of pieces that have been part of other continents in the past. A continent may have multiple cratons, or none. When they are present, they form stable regions, and experience little earthquake activity, volcanism, or deformation. Laurentia is the section of North America that runs from the eastern side of the Rocky Mountains to the Appalachians and from northern Texas to Greenland. The area surrounding it is deformed craton, having been affected by interactions with other tectonic plants. The section of North America that includes Alaska, Western Canada, California, and Mexico is an accretionary belt that has bonded to Laurentia in the last 600 million years.
Rodinia is the oldest known supercontinent, having broken apart about 780 million years ago, and having formed 1.1 billion years ago. As the continental plates move by tectonic ...
The following posting helps with descriptions of various geological concepts.