User:Abyssal/Prehistory of North America/DYK/50

...that the freshwater weed Azolla may have grown in the Arctic Ocean with enough vigour to plunge the world into an ice age?
...that Othniel Charles Marsh named two species of the dinosaur Coelurus from the same quarry, not knowing that the bones belonged to the same skeleton?
...that species of Prosaurolophus, a duckbilled dinosaur, have been described by Barnum Brown and Jack Horner, two of the most prominent paleontologists of the 20th century?

... that the Maya city of Kinal in northern Guatemala possessed an unusually complex acropolis but is noted for its complete absence of sculpted stelae and altars?