colossal fossil

you are a type of modern day titanosaur. you have a relatively short neck for a titanosaur of your size. you stand on four legs. you are the biggest thing to walk the earth. you can rear up on your hind legs. you are 259 feet including your neck. you have no tail, but you are still 209 feet long. you have no natural predators (not including sand worms). you eat vegetation. you can't jump. you can run at 276 mph. you dwarf everything in size. you are the last of your kind. you are 76. you die at 357.