User:Abyssal/Prehistory of North America/DYK/59


 * ...that Trachodon, despite being a well-known and often-used duckbill name in the past, is based on teeth that include both duckbill and horned dinosaur specimens?
 * ... that the Francis Farm Petroglyphs are among Pennsylvania's leading petroglyph sites, even though the culture of their creators is unknown?