Surprising Discovery Shows That Humans Were In The Americas 20,000 Years Earlier Than Thought

It is known that human beings have been migrating to other regions of the world over time. But perhaps the timing of this may not really be what you imagined.

One of the places in the world that functions as a time capsule like no other is the Coxcatlan cave in Mexico’s Tehuacan Valley. That’s because the cave floor is a history book, detailing thousands of years of food and technology from the planet’s ancient inhabitants.


And finally archaeologists from the United States and Mexico have excavated the first chapter of this history book. They used advanced dating techniques to be able to determine the age of the bones of animals that were buried among the oldest layers of the cave.

With that, they had amazing results. They suggested that humans had been present in the region for 33,000 years. That’s thousands of years before the ice sheets peaked, about 20,000 years ago, which is how long current evidence suggests humans were in the Americas.

For researchers to rethink their theories will still need some radiocarbon measurements. However, the results of this recent study, which was led by archaeologist Andrew Somerville of Iowa State University, should set a fire to the debate over the timeline of human migration to the center of the Americas.

“We were surprised to find these really ancient dates deep in the cave, and that means we need to take a closer look at the recovered artifacts from these levels,” said Somerville.


The discovery makes it clear why the Tehuacan-Cuicatlan Valley in southern Mexico is a UNESCO World Heritage Site. In addition to hosting great biodiversity, its dry climate has preserved records of human presence for thousands of years. This made the location very valuable to researchers interested in the spread of humans throughout the New World.

And in this archaeological treasure, the Coxcatlan cave is a real gem because of its deep layers of sediment and dry conditions that give researchers a chronology of activity dating back at least 11,000 years.

It was from the mid-1990s that scholars and academics began to have doubts about how this cave “book” should be read. They began to have concerns about dating some botanical species and saying the pages might be out of order.

This might not be just one or two layers, but about three-quarters of the plant materials that were excavated from the cave. As much as new research has since been defending the cave’s timeline, its reliability has been somewhat shaken.

The lower layers of the site have not yet been fully analyzed. And Somerville and his team realized that work needed to be done to clarify the cave’s chronology.

“We weren’t trying to think through this debate or even find really old samples. We were just trying to put our agricultural study on a tighter schedule,” said Somerville.


They performed radiocarbon dating by mass spectrometry on 14 bones of animals such as hares, rabbits and deer, which had been excavated from the cave. With that, they created a catalog of dates describing when the animals lived.

Several of the rabbit bones and femur of a hare have been dated to approximately 33,000 years. This era not only preceded all records currently held, but it would also be isolated from the rest of the world by climate change.

“Pushing the arrival of humans to North America more than 30,000 years ago would mean that humans were already in North America before the period of the Last Glacial Maximum, when the Ice Age was at its worst. Large parts of North America would have been inhospitable to human populations. The glaciers would have completely blocked any overland passage from Alaska and Canada, meaning that people would likely have had to come to the Americas by boat from the Pacific coast,” concluded Somerville.

That’s Why You Shouldn’t Rush Your Dog On The Walk.

The dog is man’s best friend. It can keep its owner company, help him walk if he is blind, serve as a method of therapy for some illness. Likewise, also brighten the environment you are in.

This friendship has lasted for centuries, and that is why the animal is considered man’s best friend. In addition to keeping their owners company, dogs are capable of saving lives. People realize that their dogs are concerned for the well-being of their owners and would try to save them if need be.

And just as our pet wants our well-being, we want his. Sometimes we may feel that we are fawning over or deciding what is best for him, but that may not always be true. So we have to learn what is good or not for our pet, and what is necessary for him to have a better life.


All dog owners know that their pet needs to get out of the house and take a walk. But during this round they can have different behaviors. For example, there are those dogs that like to sniff every flower, stone, tree or whatever object in their path.

If your pet has this behavior, it is important to know this factor. According to experts, it is important that the owner does not rush the animal when it is sniffing something.

Although these breaks are not a bother on those walks that have no time to finish, they can be complicated when the return with the dog has to be faster and the animal ends up wasting time sniffing things.

However, it is important for owners to understand the many ways in which a dog can benefit from doing this environmental investigation. Getting to understand this, with luck, owners will have more patience with their pet when it’s time to go out for a walk.

Don’t rush

Longer walks not only help to burn off all the extra fat and energy from the dog, but also give the animal the opportunity to analyze the world around it.

“Dogs were born to smell! They have a very keen sense of smell and have adapted sensory abilities over thousands of years and use this to investigate their surroundings,” explained Dr. Gabrielle Fadl.

This means that when your dog takes the time to sniff all things while walking, he is actually discovering a lot of information and learning about his surroundings.

According to experts, dogs’ sense of smell is approximately 10 times sharper than that of humans. Because of this, this sense, in animals, is the driver and works as a GPS for how pets will interact with the world.