Mesoproterozoic

The Mesoproterozoic Era is a geologic era that occurred from 1,600 to 1,000 million years ago. It was the first era of Earth's history for which scientists have a fairly clear geological record. Before this time, during the Paleoproterozoic, continents existed, but very little is known about how they looked or moved.

During the Mesoproterozoic, the large landmasses that make up our continents today were present, though they were arranged very differently on the planet's surface. This era helps scientists understand how Earth’s continents have moved and changed shape over billions of years. Studying this time helps us learn about the early history of our planet and how it evolved into the world we live on today.

Major events and characteristics

The Mesoproterozoic Era saw important changes on Earth. During this time, the large landmass called the Columbia supercontinent broke apart, and later the continents came together again to form a new supercontinent named Rodinia. These movements of the Earth's plates caused the formation of many mountain ranges in different parts of the world.

One of the most significant developments during this era was the appearance of sexual reproduction. This change allowed life to become more complex and led to the first true multicellular organisms. Scientists have discovered evidence that some forms of multicellular life existed during this time, even though for a long time it was thought that only simple, single-celled life was present. This era was also a peak time for structures called stromatolites, which were built by tiny organisms and began to decline later on.

Subdivisions

See also: Riphean age and Jotnian

The Mesoproterozoic Era is split into three parts based on time: the Calymmian from 1,600 to 1,400 million years ago, the Ectasian from 1,400 to 1,200 million years ago, and the Stenian from 1,200 to 1,000 million years ago. These divisions help scientists organize the very old history of Earth when there were not many fossils to study.

Scientists use special dating methods to decide these time periods because fossils from this time are rare. Sometimes, they might change these divisions in the future to match big changes that happened on Earth long ago.