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Today's featured article

Pencil drawing or Massospondylus carinatus

Massospondylus is a genus of prosauropod dinosaur from the early Jurassic Period, ca. 200–183 million years ago. It was described by Sir Richard Owen in 1854 from remains found in South Africa, and is thus one of the first dinosaurs to have been named. Fossils have since been found in other parts of South Africa, as well as Lesotho and Zimbabwe. Further material from the United States Kayenta Formation, India, and Argentina has been assigned to this genus, but may not belong to Massospondylus. The type, and only universally recognized species, is M. carinatus, although six other species have been named during the past 150 years. Prosauropod systematics have undergone numerous revisions during the last several years, and many scientists disagree where exactly Massospondylus lies on the dinosaur evolutionary tree. Although Massospondylus was long depicted as quadrupedal, a 2007 study found it to be bipedal. It was probably a plant eater (herbivore), although it is speculated that the prosauropods may have been omnivorous. This animal, 4–6 meters (13–20 ft) long, had a long neck and tail, with a small head and slender body. (more...)

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Today's featured picture

Arches National Park Map

A map of Arches National Park near Moab, Utah, United States, detailing the location of many of the more well known natural arches, as well as many other physical features. The park is known for preserving over 2,000 arches, including the world-famous Delicate Arch. The park is 119 square miles (310 km2) in size. Its highest elevation is 5,653 feet (1,723 m) at Elephant Butte, and its lowest elevation is 4,085 feet (1,245 m) at the visitor center. Since 1970, forty-three arches have toppled because of erosion. The park receives 10 inches (250 mm) of rain a year on average.

Map credit: Justin Morris

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