Mesoproterozoic

A long time ago, the Earth changed. Large lands moved around. One big land broke apart. Then, new lands joined together. This made a huge land mass.

Mountains grew during this time. Many parts of the world grew tall. This happened as the lands moved.

Life was changing too. Small things grew into bigger life. They learned to make new life in a new way. This helped life become more complex.

Tiny living things also grew in large groups. These groups were very common then.

It was a very busy time for our world.

The Mesoproterozoic was a long era of Earth's history. We have a good record of this time. Large pieces of land moved on our planet. These pieces are called continental plates.

A huge land mass called Columbia broke apart. This happened between 1500 and 1350 million years ago. Later, land pieces joined to make Rodinia. This new supercontinent formed around 1100 to 900 million years ago.

Moving lands made many mountains. These mountain-building events are called orogenies. Many orogenies happened in Africa and Antarctica. They also happened in Europe and North America.

Life was changing in big ways too. Living things began sexual reproduction. This is a way to make new life. It helped life become more complex. Some life forms were made of many cells. These are called multicellular organisms.

Stromatolites were also very common then. These are groups of tiny living things. This era is split into three parts. They are the Calymmian, the Ectasian, and the Stenian. These names help us study the time.

The Mesoproterozoic was a very long era in Earth's history. It is the first era where we have a clear geological record. Before this, we knew continents existed, but we knew very little about them. During the Mesoproterozoic, the land masses were much like the ones we see today. However, their places on the Earth's surface were arranged differently. This era helps us understand how our world changed over time.

Large pieces of land moved during this time. This movement is called plate tectonics. First, a huge land mass called Columbia broke apart. This happened between 1500 and 1350 million years ago. Later, those pieces joined to form a new supercontinent called Rodinia. This happened between 1100 and 900 million years ago. This move happened near the boundary of the next era.

These moving plates also built many mountains. Scientists call these mountain-building events orogenies. Many different orogenies happened all over the world. The Kibaran orogeny took place in Africa. The Late Ruker orogeny happened in Antarctica. In Europe, the Gothian and Sveconorwegian orogenies occurred. North America saw the Picuris and Grenville orogenies.

Life was also changing in amazing ways. This era saw the start of sexual reproduction. This way of making life helped living things become more complex. It also led to true multicellular organisms. These are living things made of many cells. Stromatolites were also very common during this time. They reached a high point before they declined later.

Scientists divide this era into three parts. These parts are the Calymmian, the Ectasian, and the Stenian. The Calymmian lasted from 1600 to 1400 million years ago. The Ectasian lasted from 1400 to 1200 million years ago. The Stenian lasted from 1200 to 1000 million years ago. These divisions help us track major changes in the Earth. We use radiometric dating to help find these dates.

The Mesoproterozoic Era is a major period in Earth's geologic history. It is the first era where a fairly definitive geological record survives. Before this era, during the Paleoproterozoic, continents already existed. However, scientists know very little about those earlier land masses. The continents of the Mesoproterozoic were mostly the same as today's continents. Their arrangement on the Earth's surface was simply different. This era provides a vital window into how our planet's crust behaves.

Plate tectonics drove many massive changes during this time. Plate tectonics is the movement of large pieces of Earth's crust. One major event was the breakup of the Columbia supercontinent. This massive land mass split apart between 1500 and 1350 million years ago. Later, the resulting fragments reassembled into a new supercontinent called Rodinia. This formation of Rodinia happened between 1100 and 900 million years ago. This occurred near the boundary of the next era, the Neoproterozoic.

These shifting plates also caused many orogenies. An orogeny is an episode of mountain building. Many different orogenies occurred across the globe during this era. In Africa, the Kibaran orogeny took place. The Late Ruker orogeny occurred in Antarctica. Europe experienced the Gothian and Sveconorwegian orogenies. North America saw the Picuris and Grenville orogenies. These events show how much the Earth's surface changed.

Life also underwent significant transformations during the Mesoproterozoic. The era saw the evolution of sexual reproduction. This biological process helped increase the complexity of future life. It also marked the start of true multicellular organisms. While scientists once thought life was only microbial, recent finds prove otherwise. Multicellular life did exist during this era. Additionally, stromatolites reached a high point during this period. These structures declined later in the Neoproterozoic.

Scientists divide the Mesoproterozoic into three specific subdivisions. These divisions are based on time rather than rock layers. They are not considered geostratigraphic or biostratigraphic units. The Calymmian period lasted from 1600 to 1400 million years ago. The Ectasian period lasted from 1400 to 1200 million years ago. The Stenian period lasted from 1200 to 1000 million years ago. These time scales help researchers organize the era's history.

Each subdivision has its own unique geological characteristics. The Calymmian and Ectasian periods were defined by certain stability. They featured the stabilization and expansion of cratonic covers. A craton is a stable part of a continental plate. In contrast, the Stenian period was different. It was characterized by the formation of orogenic belts. These belts are long chains of mountains. This shows how the Earth's crust changed over millions of years.

Researchers use radiometric dating to define these Precambrian subdivisions. This method uses the decay of atoms to find ages. It is used because the fossil record is often sparse. Some scientists use an unofficial period called the Rodinian. This period spans from 1780 to 850 million years ago. It is based on stratigraphy rather than chronometry. However, the International Union of Geological Sciences has not officially adopted it. Future revisions may create more natural boundaries based on geologic events.