columbia
n. uncountablen. a very old part of the Earth's land that existed billions of years ago. It was one of the first times all the continents were joined together into one giant piece of land.
n. a Paleoproterozoic supercontinent that existed approximately 2.1 to 1.8 billion years ago. It represents one of the earliest known assemblies of the Earth's major continental blocks into a single landmass.
Scientists study rocks to learn about the ancient continent of Columbia.
Geologists use magnetic data from ancient rocks to map how Columbia broke apart into smaller continents.
The assembly of Columbia marked a significant period in Earth's tectonic history, as it brought together cratons that would later form the foundations of modern North America and Eurasia.
From Columbus + -ia, the Latinized name of the European explorer, Christopher Columbus. Piecewise doublet of Colombia.
When used in a geological context, it is a proper noun and is almost always capitalized.