Alamosaurus was a massive plant-eater (herbivore) that lived in the late
Cretaceous period,
between about 70 and 65 million years ago, in North America - in the region that
is today the southwestern part of the United States.
Alamosaurus was usually around 69 feet (21 meters) long, and probably weighed around 33 tons.
The first
fossils
of Alamosaurus were found by Charles W. Gilmore in
1922.
He found a pelvic bone ("ischium") and a shoulder bone ("scapula"). Later in
1946,
Gilmore discovered further
fossils, including
a complete tail, a nearly complete right forelimb, and both pelvic bones ("ischia").
Various other Alamosaurus fossils
have also subsequently been found in the southwestern
US, but no skull material (other than a few teeth)
have yet been found.
"Alamosaurus" means "Alamo lizard" ("Alamo" refers to the Ojo Alamo Formation, the former name of a geological formation (today known as the "Kirtland Shale") in New Mexico, and does not refer to The Alamo in Texas). The name was chosen by Charles W. Gilmore in 1922.
Alamosaurus was a member of the Saurischia ("lizard-hipped") order of dinosaurs. What this means, is that although Alamosaurus was not closely related to lizards, it did have similarly shaped pelvic bones.
Alamosaurus was a Sauropod - a member of a group of related large quadrupedal herbivorous (plant-eating) dinosaur with long necks.
Alamosaurus lived between about 70 million years ago and 65 million years ago, during the late Cretaceous period.
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