When it comes to dinosaurs, North America, China, and South America have decided advantages over other countries—they are large and have vast quantities of sedimentary rock deposited in ancient river or floodplain environments during the Mesozoic Era, the age of dinosaurs.
Recently the first dinosaur fossil from Bulgaria was described. It’s no Sue, the most complete T. rex ever found, but a single bone 10 cm long and 5 cm wide interpreted as the left humerous—the upper bone in the forelimb--of a Late Cretaceous Theropod—a European cousin to Sue.
The bone was found in limestone—a sedimentary rock usually deposited in a marine environment, but the isotopic signature of the bone differs from that of the limestone, indicating that the bone was probably transported into the shallow sea after burial and fossilization.
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