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This weekend’s Identification Day brought legions of visitors to the Museum’s Theodore Roosevelt Memorial Hall with items like feathers, fossils, rocks, and other items from personal collections to be identified by Museum scientists.

Last week, we introduced you to some of the items Museum employees were hoping to have identified during the event. Here are the results:

Erin on our video team dug up these fossils during a camping trip in eastern Montana. The larger of the two was identified as a dinosaur bone, though what species of dinosaur was unclear. The smaller fossil is likely the fossil of a freshwater turtle. Both fossils hail from the Late Cretaceous.

Anna in Marketing brought in this vertebrae, which was identified by Eleanor Hoeger of the Department of Mammalogy as being from a reindeer. She also brought in a trilobite fossil she’d received as a gift. The fossil was found to be a 350-million-year-old specimen from the Phacopid group.

Rosa from the Marketing team brought in several mineral specimens, which were identified by Céline Martin in the Department of Earth and Planetary Sciences. The purple rock was is erythrite, possibly from Morocco, the white is appophyllite and stilbite from India, and the orange stone is a fire opal of undetermined origin. The grey rock, meanwhile, is a fossil of some kind, likely an ancient aquatic invertebrate called a bryozoan, says Susan Klofak. 

See more ID day item reveals on the Museum blog.