• pond surrounded by green brush, reflecting a distant range of snow-covered mountains that are dominated by one massive mountain

    Denali

    National Park & Preserve Alaska

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  • Road Closure: Friday, September 26

    On Friday, September 26, a contractor will be working on a utility below the park road near Headquarters. Therefore, the road will be closed to all vehicle traffic at roughly Mile 3. The road will re-open on Saturday morning.

Plant Fossils

composite image of fossilized fern and living fern

A fossilized fern at right, a living fern at left.

NPS Photo

Flowering Plants (Angiosperms)

Some of the trees and plants that lived in Denali in the Late Cretaceous had flowers. These are called angiosperms. They produce a wide variety of leaf types. Researchers have found at least 23 different leaf fossils in Denali, and many of them appear very similar to leaves we see around the park now.

Conifers (Gymnosperms)

Conifers, plants that have needles rather than leaves, are called gymnosperms. Conifer cones (like pine cones) and needles are common fossils in the Cantwell Formation. Spruce and pine trees seen today are modern forms of conifer trees.

Ferns (Pteridophytes)

Pteridophytes are plants that reproduce using spores rather than seeds and are the oldest type of plants on Earth. The first pteridophytes lived over 400 million years ago!
Ferns are a type of pteridophyte that existed 70 million years ago, and we still see throughout the park today.

Horsetails (Pteridophytes)

Horsetails (also known as equisetum) are another type of pteridophyte that existed 70 million years ago, and still exist in the park. Today these plants grow close to the ground, but in the age of dinosaurs horsetails could grow up to 100 feet tall. Most of the fossilized horsetails in Denali are under three feet. Horestails fossilize well because they contain a lot of silica, a mineral that makes the plant harder and more durable than most other plants.

Did You Know?

a thin green plant against a background of white clouds, blue sky and bright sun

Visibility is an important component of measuring Denali's air quality. Visibility data, such as that from the Wonder Lake camera, supplements chemical data from filter samples. Air here is still clean, but traces of pollution from local, regional and international sources exists on filter samples.