Trip to Arizona, January 7 - January 18, 2004

Petrified Forest National Park

Fossils exposed in the park are from Chinle Formation, Triassic Period

Scattered Wood

Giant Log, "Old Faithful"

Petrified Log Texture. Which minerals produce the colors?

The fossilized logs are from Araucarioxylon arizonicum, Woodworthia and Schilderia. All 3 species are now extinct.


The Tepees. Distinct white layers are sandstone, the cap is clay, dark layers have high carbon content, darker reds are iron-stained siltstone, reddish bases are hematite.

The Tepees. See the legend above.

Desert Freedom

Newspaper Rock. See detail below

Ancient Petroglyphs on the Newspaper Rock (dated from about 1000-1350 A.D.)

Painted Desert

Rainbow of colorful sediments

Back to Phoenix. I-40. San Francisco Peaks are on the horizon

Montezuma Well. Montezuma Well is a limestone sink formed long ago by the collapse of an immense underground cavern.

Phoenix Area. Desert Botanical Garden


Brain Cactus

Saguaro Cactus

Saguaro Cactus

Cottontail :)

Papago Mountain. The red rock (iron oxide-hematite) of the mountain was formed 6 to 15 million years ago

Phoenix Area. Camelback Mountain

Tilted layers of Tertiary red rocks (Camel's Head Formation) lies on a much larger and higher mass of Precambrian granite. Summit elevation is 2704 ft (824 m) -- the peak rises about 1600 ft (488 m) above the elevation of downtown Phoenix.

Camel's Head

View of Tempe

View of Phoenix Downtown

Oasis in the desert

Riding on the camelback

Ground Squirrel

Holes in the Back of the Camel

Oasis in the desert

CamelBack (in front to the left) as viewed from other mountain

Phoenix Downtown

Olga and Jason (and lichen)

Tucson Area

Tucson lies in the valley

University of Arizona campus

Old Main. U of A.


Steward Observatory

Sonoran Desert Museum

Kitt Peak

The summit of Kitt Peak is at an elevation of 6,875 feet

Evening Haze. Kitt Peak

Sunset at Kitt Peak

Sunset at Kitt Peak

Sunset at Kitt Peak