Better Students Ask More Questions.
What were the other supercontinents before Pangaea?Current theory suggests that Pangaea...
What were the other supercontinents before Pangaea?
Current theory suggests that Pangaea was not the first supercontinent, and that there were several others that also broke apart and reformed. What were these other supercontinents called and how long ago did they exist?
3 Answers | add yours
As far as I can tell, the current thinking is that there were two supercontinents before Pangaea. There was Rodinia (the one I posted a link about the last time you asked about this) and one supercontinent prior to that. That first supercontinent has been called "Columbia" because the best evidence for it can be found near the Columbia River.
Columbia began to assemble 1.8 billion years ago. It appears to have started breaking up 1.5 billion years ago. The continents reformed into Rodinia around 1 billion years ago. Rodinia lasted until about 700 million years ago.
Posted by pohnpei397 on December 23, 2009 at 10:43 AM (Answer #1)
Middle School Teacher
Scientists have been able to trace back the changes of the planets plates over the past years leading them to hypothesize that there were three known super continents. The most recent theory is that the plate tectonics movement are cyclical and do not occur by chance. In order for a continent to be considered a super continent, it must be a combination of land masses far exceeding the size of present day continents. There were many such continents but not as big as Pangae. They are Gondwana ( 570 and 510 million years ago), Laurasia (Mesoicozoa Era) , Pannotia (540 million years ago), Rodina (1100 and 750 million years ago), Columbia, Kenorland, Nena, Ur, and Vaalbara. It is important to note that most of the super continents have been in theory.
Posted by mkcapen1 on December 23, 2009 at 11:01 AM (Answer #2)
High School Teacher
It is theorized that approximately 430 million years ago the southern continents were joined as a single land mass known as Gondwana. In the late Paleozoic it is believed that the ancestor of North America may have collided with the ancestor of Africa. By about 410 million years ago this land mass collided with the ancestors of Asia and Siberia. The combination of these ancestral land masses was known as Laurasia. By approximately 250 million years ago with the migration of Gondwana northward the super continent of Pangaea was formed. (After C. Scotses, R. K. Bambach, R. VandedrVoo, and A. Ziegler)
Posted by djmccormick on December 24, 2009 at 10:03 AM (Answer #3)
Related QuestionsSee all »
Join to answer this question
Join a community of thousands of dedicated teachers and students.