Dmanisi hominins

Long ago, people lived in a new land.

They lived in a place with forests and grass. They lived near an old lake shore.

Scientists found many old bones in the dirt. They found five different skulls. These people used stones to make tools.

Some bones show they were very small. Their legs helped them walk for a long time. It is amazing to see these old bones.

In Georgia, scientists found very old fossils.

These fossils belong to early people called Dmanisi hominins. They lived about 1.8 million years ago.

These people lived near an old lake shore. The land had many forests and grasslands.

Scientists found five famous skulls at the site.

These skulls show many different shapes. Some skulls were from young people. Other skulls were from old people. This helps us see how they lived.

These people had small brains. Their brains were between 545 and 775 cc. We call cc cubic centimeters. That is a way to measure size. Their bodies were also small. They stood about 145 to 166 cm tall. Their legs were like ours. This helped them walk or run long distances. Their arms were different. Their arms were more like apes. They also used stone tools to work.

Experts still study these people today. They want to know how they moved out of Africa.

Deep in the country of Georgia, scientists found a huge treasure of history.

These fossils belong to a group called the Dmanisi hominins. They lived a very long time ago. Most of their remains are between 1.77 and 1.85 million years old.

This makes them the earliest well-dated fossils of early humans in Eurasia. They are also the best-preserved fossils from a single site this old. Finding them helps us understand how early people first moved out of Africa.

These early people lived in a very different world.

The climate in Georgia was more humid and forested than it is today. It felt more like a Mediterranean climate with forests and grasslands. They lived near the shore of an ancient lake. This area was full of many different kinds of animals. The nice weather might have acted as a refuge for them. They could reach this place from Africa through a path called the Levantine corridor.

Scientists have found many bones and stone tools at the site.

They found over a hundred bones from bodies and limbs. They also found five very famous skulls. These skulls are known as Dmanisi Skulls 1 through 5. The people used stone tools from the Oldowan tradition. These tools were very simple and old. Their bodies were small, standing about 145 to 166 cm tall. Their brains were also small, measuring between 545 and 775 cc.

Learning about these people took many years of hard work. Excavations first began in 1936 thanks to Ivane Javakhishvili. In 1982, archaeologists found deep pits in the sandy clay. They soon found fossilized animal bones inside those pits. In 1991, a team led by Medea Nioradze and Antje Justus found a jawbone. This was a huge moment for science. It was the first time researchers found early human relatives in this area. They spent many years carefully digging up more pieces.

Even today, experts are still debating what to call these people. Some scientists think they are a new species called Homo georgicus. Others believe they are a type of Homo erectus. The skulls look very different from one another. Some show features like modern humans. Other parts of their bodies look more like earlier ancestors. This mix of traits makes them very special to study. They show us how much early humans could change and vary.

The Dmanisi hominins were a population of early human relatives living during the Early Pleistocene.

Their fossils were recovered at a site in Dmanisi, Georgia. These remains are incredibly important to science. They are the earliest well-dated hominin fossils found in Eurasia.

The fossils also represent the best-preserved remains of early Homo from a single site of this age. Studying them helps researchers understand how early humans migrated out of Africa.

Researchers have discovered over one hundred postcranial fossils at the site. Postcranial fossils are bones from the body, such as the arms, legs, ribs, and feet.

They also found five famous, well-preserved skulls known as Dmanisi Skulls 1 through 5. These individuals lived between 1.77 and 1.85 million years ago. The site was once a lush environment near an ancient lake shore. It featured forests and grasslands with a humid, Mediterranean-style climate. This favorable environment may have acted as a refuge for these early people.

The anatomy of the Dmanisi hominins shows a mosaic of different traits. A mosaic means they had a mix of features from different groups. Some of their traits resemble modern humans or later Homo erectus. Other traits are more primitive, like those seen in Australopithecus. For example, their leg length and shape were essentially modern. This would have allowed them to walk and run over long distances. However, their arms were likely more similar to modern non-human apes. Their bodies were also quite small, ranging from 145 to 166 cm in height. Their brain sizes were between 545 and 775 cc, which is more comparable to Homo habilis.

The history of these discoveries began with early work in 1936. In 1982, archaeologists found deep pits in sandy clay. They soon found fossilized animal bones within these pits. A major breakthrough occurred on September 25, 1991. A team led by Medea Nioradze and Antje Justus uncovered a mandible, which is a jawbone. This jaw, named D211, was a primate jaw with a complete row of teeth. It was the first evidence of early Homo outside of Africa. This discovery was confirmed when the underlying basalt rocks were dated to 1.8 million years old.

Scientists have found several distinct skulls that provide different clues. Skull 1 is an adult skull with thick brow ridges. Skull 2 is a more gracile, or slender, skull likely belonging to an adolescent female. Skull 3 was found in 2001 and belonged to a young individual with erupting wisdom teeth.

Skull 4 is a very important find because it is the only toothless hominin skull found in such early sediments. It belonged to an elderly individual. Finally, Skull 5 was discovered in 2005.

Skull 5 was the first completely preserved adult hominin skull from the Early Pleistocene. It was found alongside a massive jaw named D2600.

The classification of these hominins is a subject of great scientific debate. Because of the large variation between the skulls, some researchers proposed a new species. In 2002, the large D2600 jaw was named the type specimen for Homo georgicus. This suggested that more than one species might have lived at Dmanisi. However, other researchers believe all the skulls belong to the same species. They argue the differences are just caused by sexual dimorphism, or differences between males and females. They also suggest the differences come from the different ages of the individuals. Some experts suggest they should be classified as Homo erectus georgicus.

The Dmanisi site provides a unique window into the lives of early humans.

The fossils show how much variation existed within early human populations. The presence of Oldowan stone tools shows their technology was quite archaic. These tools were much more primitive than others found later in Europe. The site connects the study of human evolution to many other fields. It links biology, geology, and archaeology to explain how our ancestors moved across the world. By studying these bones, we learn how humans adapted to new environments outside of Africa.