Macronarians of the Morrison

An encounter near the edge of a highland forest between a trio of Brachiosaurus altithorax and the very rare basal macronarian sauropod Haplocanthosaurus delfsi, in the Morrison formation in Colorado, 150 million years ago. Stegosaurus armatus also makes a brief appearance.

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Brachiosaurus altithorax was one of the largest "classic" sauropods of the Morrison formation, with large adults (such as the one formerly known as "Ultrasauros") reaching up to 90 feet in length and weighing 45 tons. Haplocanthosaurus, a distant relative, reached only 50 feet as an adult and was a "living fossil" in its own time, thought to be descended in a direct line from the common ancestor of both brachiosaurs and camarasaurs.