This picture shows the skull and spine of a scary looking Deinonychus skeleton, the photo was taken at the Philadelphia Academy of Natural Sciences. Deinonychus was related to the Velociraptor and lived during the early Cretaceous Period (around 110.
Calcite with quartz from Huanggang Mine, Inner Mongolia, China. The pictured specimen is 7cm tall. The quartz at the center of the stacked calcite disks is better exposed in some of the specimens that they have at the show. Photo credit: Jeffrey A. S