User:Abyssal/Prehistory of North America/DYK/31


 * ... that many of the pre-Columbian Etowah plates found at Etowah Indian Mounds in Georgia were thought to have been made at Cahokia in western Illinois?
 * ... that of the 17 confirmed Olmec colossal heads of Mexico (example pictured), the largest is estimated to weigh 40 tons?
 * ... that Mississippi's Spanish Fort is neither Spanish nor a fort?
 * ...that Fossil Cycad National Monument, established in South Dakota in 1922, was withdrawn as a national monument in 1956 because all of the visible fossils had been stolen?
 * ... that the extinct rose family member Neviusia dunthornei is one of only three known Neviusia species?
 * ... that the primary leaf veins for the extinct plant Trochodendron nastae are palmate rather than being pinnate like those in the living Trochodendron aralioides?
 * ... that amber fossils of ants carrying the extinct mealybug genus Electromyrmococcus represent the oldest record of symbiosis between mealybugs and Acropyga ants?
 * ... that the extinct Eocene maples Acer hillsi and Acer stewarti are distinguished by how inflated the nut is?
 * ... that the extinct Eocene butterfly Prodryas persephone (pictured) from the Florissant Fossil Beds is the best preserved fossil lepidopteran discovered to date?
 * ... that the first described fossil of Anochetus dubius is surrounded by a brownish bacterial growth?