True
That was Pangea (from the Greek for Entire Earth). It was surrounded by Panthallasa (Greek for Entire Sea).
The Appalachian mountains in North America were formed by a continent-continent collision in the Paleozoic.
The supercontinent Pangaea formed roughly 335 million years ago during the late Paleozoic era, when all the Earth's landmasses were joined together into one large landmass.
Pangaea
Rodinia formed about 1.3 billion years ago during the Mesoproterozoic era and began to break apart around 750 million years ago during the Neoproterozoic era.
Existing during the Paleozoic and some of the Mesozoic era, the super continent in Pangea was formed about 300 million years ago. Pangea separated about 200 million years ago.
I believe it is in the Cenozoic Era because they were formed in the last ice age which was during this era.
Pangaea, the supercontinent, was formed during the late Paleozoic Era, specifically in the Permian Period. It existed approximately 300 million years ago.
End of the Mesozoic era
The adjective that can be formed from the word "continent" is "continental."
When it was formed, it was in the Mesozoic era, but it ended in the Cenozoic era.