Petrified Forest National Park

This park is in Arizona.

It sits near the Painted Desert. The land is dry and windy.

You can see colorful hills there. Many old trees lived here long ago. These trees fell into the dirt. The dirt helped them turn into stone.

Now they look like bright, colorful wood. You can also find fossils of old animals. It is a very special place to visit.

Petrified Forest National Park is in northeastern Arizona.

It sits in Navajo and Apache counties. The park is part of the Colorado Plateau. The north part of the park reaches into the Painted Desert.

The land is a dry and windy place. You might see colorful badlands with many hills.

The park has many plants like bunchgrass. You can also find animals like coyotes and bobcats. More than 200 kinds of birds live there too.

The park is famous for its fossils. Long ago, trees lived in this area. About 225 million years ago, these trees fell into river mud. This mud had volcanic ash in it. Over time, the wood turned into stone. This is called petrification.

The stone logs have many bright colors. You can also find fossils of old plants and animals. These include early dinosaurs and giant reptiles.

People have studied these fossils for a long time. Many people visit the park to see them.

Petrified Forest National Park is a special place in northeastern Arizona.

It sits in both Navajo and Apache counties. The park is part of a large area called the Colorado Plateau. The northern part of the park reaches into the colorful Painted Desert.

You can find the park headquarters near the city of Holbrook. It sits along Interstate 40 and the BNSF Railway. Many things like the Puerco River cross the park from east to west.

The land here is dry and windy. The weather changes a lot throughout the year. Summer days can be quite hot. In the winter, temperatures can drop well below freezing.

You might see gentle hills in the south. The north has colorful badlands with many cliffs and gullies.

More than 400 kinds of plants grow here. Many are grasses like blue grama or sacaton. You might also see animals like coyotes, bobcats, or pronghorns.

Over 200 kinds of birds live in the park too.

The park is famous for its amazing fossils. Long ago, about 225 million years, this area was near the equator. It was a humid place with many trees.

When trees fell into river mud, they were buried by sediment. This sediment often contained volcanic ash. Over a very long time, water carried silica from the ash into the wood. The silica turned into quartz crystals and replaced the organic parts. This turned the wood into stone. Different minerals made the logs many bright colors.

Many different things have been found in the rock layers. Scientists study these fossils to learn about the past.

You can find fossils of ancient ferns and ginkgoes. There are also fossils of giant reptiles called phytosaurs.

Some fossils even belong to early dinosaurs and large amphibians. Humans have lived near this land for a very long time. The first people arrived about 13,000 years ago.

Later, Ancestral Pueblo farmers lived here in houses called pueblos. They moved to other areas around 1450 CE.

Today, people still visit the park to see these wonders. In 2018, over 644,000 people came to visit.

The park was first named a national monument in 1906. It became a national park in 1962. People can see the history of the land through the rocks and the fossils.

Even though it is a protected place, people still try to take petrified wood. This is a problem that continues in the 21st century. The park helps us remember the ancient plants and animals that once lived here.

Petrified Forest National Park is a protected area located in northeastern Arizona.

It straddles the border between Navajo and Apache counties. The park is part of the larger Colorado Plateau. The northern section of the park extends into the Painted Desert.

Major routes like Interstate 40 and the BNSF Railway cross the park from east to west. The Puerco River also flows through the landscape. This park is famous for its massive deposits of petrified wood. These fossils tell a story of a world from millions of years ago.

The process of petrification turned ancient wood into stone. During the Late Triassic Epoch, about 225 million years ago, this region was near the equator. The climate was humid and sub-tropical.

Trees fell into river channels and were buried by sediment. This sediment often contained volcanic ash. Groundwater dissolved silica, or silicon dioxide, from that ash. The silica moved into the logs and formed quartz crystals. These crystals gradually replaced the organic matter of the wood. Traces of iron oxide created the many bright colors seen in the logs today.

The geology of the park is defined by the Chinle Formation. This formation is up to 100 feet thick in some areas. It consists of sedimentary rocks like mudstone, siltstone, and claystone. It also includes harder rocks like sandstone and limestone. Much of the clay is bentonite, which swells when wet and shrinks when dry. This movement makes it hard for plants to grow on the surface. Because there is little plant cover, the wind and water erode the land easily. This creates the colorful badlands, mesas, and buttes seen in the Painted Desert.

Earth's tectonic forces changed the landscape significantly. About 60 million years ago, the Colorado Plateau began to rise. This uplift exposed the rock layers to more intense erosion. Wind and water have since removed almost all the rock layers above the Chinle Formation. This has created a massive unconformity, which is a break in the geological record. Only a few recent layers, like the Bidahochi Formation, remain in parts of the park. The Bidahochi contains ash and lava from ancient volcanic eruptions. These eruptions created volcanic landforms called maars, which are circular craters.

The park contains a vast array of fossilized life. Scientists have identified at least nine species of extinct fossil trees. Most of the petrified wood comes from an extinct conifer called Araucarioxylon arizonicum. The Chinle Formation is one of the richest fossil-plant deposits in the world. It contains over 200 different fossil plant taxa, including ferns, cycads, and ginkgoes. The park also hosts a diverse group of fossil animals. These include early theropod dinosaurs, large amphibians, and giant reptiles called phytosaurs.

Human history in the park is also very long. The earliest inhabitants were Clovis-era people who arrived 13,000 years ago. These people are the ancestors of Native Americans. By 2,500 years ago, Ancestral Pueblo farmers lived in the area. They grew corn and lived in subterranean pit houses. About 1,000 years ago, they built masonry dwellings called pueblos. They also used large communal buildings called great kivas. By 1450 CE, these farmers migrated to the Hopi Mesas and Zuni. Today, thousands of their descendants still live in those communities. More than 1,000 archaeological sites, including petroglyphs, remain in the park.

Today, the park is a place of scientific study and tourism. It was declared a national monument in 1906 and a national park in 1962. In 2018, the park welcomed 644,922 recreational visitors. The environment is a semi-desert shrub steppe with a dry, windy climate. It is home to over 400 plant species and 200 bird species. Animals like coyotes, bobcats, and pronghorns roam the land.

While the park protects these treasures, theft of petrified wood remains a problem. The park continues to serve as a vital link to the deep history of our planet.