I’ve been talking about Miocene fossils for several days now, so I thought I’d shift over to dinosaurs for a bit.I showed pictures of this bone while still in the field, and we opened the jacket on Dino Day. It’s a scapulocoracoid (shoulder blade) from a sauropod dinosaur, probably a diplodocid like this one on exhibit at the Denver Museum of Nature and Science:
In our specimen, the dark area on the right is the “coracoid” part of the “scapulocoracoid”; the back part is the scapula. The coracoid is dark because it’s been cleaned, while the scapula is still covered with a thin layer of sediment over most of its surface.
It takes awhile to remove this sediment, because it’s glued to the surface of the bone. To make the bone strong enough for jacketing, the entire surface was covered with a thin glue in the field. In the lab, we have to remove the glue, then remove the sediment, and then finally re-glue the bone.