A study of a Troodon egg containing embryonic remains using epifluorescence microscopy and other techniques

A partial egg containing embryonic skeletal elements represents the first Troodon egg collected from the Upper Cretaceous (Campanian) Judith River Formation of central Montana. The egg fragment contains disarticulated bones, including a vertebral centrum and a single tooth. Histological sections of a limb bone reveal six to eight layers of vascular canals, profuse vascular space, abundant osteocytes, and evidence of initial osteonal development....