Diplodocus now common scientific opinion that "Seismosaurus hallorum" is a species of "Diplodocus". This genus of dinosaurs lived in what is now mid-western North America at the end of the Jurassic period. "Diplodocus" is one of the more common dinosaur fossils found in the middle to upper Morrison Formation, between about 154 and 152 million years ago, during the late Kimmeridgian age. The Morrison Formation records an environment and time dominated by gigantic sauropod dinosaurs, such as "Apatosaurus", "Barosaurus", "Brachiosaurus", "Brontosaurus", and "Camarasaurus". "Diplodocus" is among the most easily identifiable dinosaurs, with its typical sauropod shape, long neck and tail, and
Tomb of the Known Soldier military burial in France. Charles’ mother received the telegram from the War Department that her son was killed in the war. After waiting four long years, she finally claimed her son’s body when it arrived on a troopship called the "Cambria" on March 29, 1922. The U.S. Government had the idea of creating the Tomb of the Unknown Soldier and of a "Known Soldier" in Arlington National Cemetery to honor World War I soldiers. Graves was chosen for "America's Known Soldier" by a blindfolded sailor who picked Graves' name from an American soldier remains list, but his mother objected to