Grenvillian Orogeny

Between 1.1 and 1.0 billion years ago, the collision of Laurentia and Amazonia produced a mountain belt of Himalayan proportions spanning over 12,000 kilometers. This prolonged continental collision, lasting more than 100 million years, created double crustal thickness and high-grade metamorphic rocks. The resulting mountain chain played a central role in welding together the fragments that became the supercontinent Rodinia.