Earth Imaging Journal: Remote Sensing, Satellite Images, Satellite Imagery
Breaking News
Map of the month: GfK Purchasing Power Europe 2017
Europeans have an average of €13,937 available for spending...
.Earth Domain Celebrates Second Anniversary By Making a Positive Impact Both Online and Offline
Interlink Co., Ltd., the official operator of the .Earth...
SSL Selected to Conduct Power and Propulsion Study for NASA’s Deep Space Gateway Concept
PALO ALTO, Calif. - SSL, a business unit of...
Esri Collaborates with Mobileye to Bring Real-Time Sensor Data to Public Transit
REDLANDS, Calif.— Esri, the global leader in spatial analytics,...
CTIA Calls on FAA to Recognize That Commercial Wireless Networks Offer Best Platform to Support Fast-Growing Drone Market
WASHINGTON - CTIA, the wireless association, today called on the...

May 24, 2011
Tassili n’Ajjer National Park

NASA

Tassili n’Ajjer National Park covers 72,000 square kilometers (27,800 square miles) in southeastern Algeria. Part of the Sahara Desert, the park has a bone-dry climate with scant rainfall, yet does not blend in with Saharan dunes. Instead, the rocky plateau rises above the surrounding sand seas. Rich in geologic and human history, Tassili n’Ajjer is a United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage Site.

This image is made from multiple observations by the Landsat 7 satellite in the year 2000. It uses a combination of infrared, near-infrared, and visible light to better distinguish between the park’s various rock types. Sand appears in shades of yellow and tan. Granite rocks appear brick red. Blue areas are likely salts. As the patchwork of colors suggests, the geology of Tassili n’Ajjer is complex. The plateau is composed of sandstone around a mass of granite dating from the Precambrian.

Over billions of years, alternating wet and dry climates have shaped these rocks in multiple ways. Deep ravines are cut into cliff faces along the plateau’s northern margin. The ravines are remnants of ancient rivers that once flowed off the plateau into nearby lakes. Where those lakes once rippled, winds now sculpt the dunes of giant sand seas. In drier periods, winds eroded the sandstones of the plateau into “stone forests,” and natural arches. Not surprisingly, the park’s name means “plateau of chasms.”

Humans have also modified the park’s rocks. Some 15,000 engravings have so far been identified in Tassili n’Ajjer. From about 10,000 B.C. to the first few centuries A.D., successive populations also left the remains of homes and burial mounds.

Comments are closed.