Defpuma - Untitled

Taking part in a predator study in the Mount Hood National Forest. Got some great pics including blurry picture of an endangered subspecies of Red Fox!

Penelope.

Jake battling the hose

Meet a Mount: Peabody Museum Stegosaurus

Taxon: Stegosaurus ungulatus

Specimen Number: PMNH 1853 and PMNH 1858

Year Created: 1910

Stegosaurus was a strange looking animal, but with its long, tottering legs and minuscule head, the Peabody Museum of Natural History Stegosaurus ungulatus mount is stranger still. This mount, constructed by Hugh Gibb and W.S. Benton under the supervision of curator Richard Lull, owes its bizarre proportions to the fact that it is a chimeric combination of at least five differently-sized individuals. 

 O.C. Marsh named Stegosaurus ungulatus in 1877 based on fossils found at Como Bluff, Wyoming, and illustrated it with eight tail spikes. Although modern researchers have since rejected this reconstruction, the mount at Marsh’s home institution still sports the extra-spikey tail. In another way, however, this Stegosaurus mount was ahead of its time. Lull insisted that the tail was held aloft, rather than dragging on the ground, to better function as a defensive weapon.

Tilly Jane, Mount Hood, Oregon

The “dinosaur bones” that you see on display at the Museum aren’t really bones at all. Through the process of fossilization, ancient animal bones are turned into rock. 

Most ancient animals never became fossils. Their carcasses were likely consumed by other organisms, or worn away by wind or water. But sometimes the conditions were right and their remains were preserved. The most common process of fossilization happens when an animal is buried by sediment, such as sand or silt, shortly after it dies. Its bones are protected from rotting by layers of sediment. As its body decomposes all the fleshy parts wear away and only the hard parts, like bones, teeth, and horns, are left behind. Over millions of years, water in the nearby rocks surrounds these hard parts, and minerals in the water replace them, bit by bit. When the minerals have completely replaced the organic tissue, what’s left is a solid rock copy of the original specimen.

Learn more on the Museum’s Dinosaur website. 

Reflections of Mt Hood  | © Photographer |  LFST