User:Abyssal/Prehistory of North America/DYK/43

... that multiple Leptocleidus skeletons have been found preserved as gemstone quality opal over the course of the history of plesiosaur research?
... that the extinct Eocene maples Acer hillsi and Acer stewarti are distinguished by how inflated the nut is?
... that fossil specimens of the extinct scorpionfly family Dinopanorpidae, which includes Dinopanorpa and Dinokanaga, sometimes have preserved dark with light to clear color patterning?
... that the recently discovered Eocypselus rowei may be ancestral to both hummingbirds and swifts?
... that excavations in 1887 and 1919 on Bussell Island uncovered a number of small, round graves of early inhabitants of present-day Tennessee, United States, circa 3000 BC to 1000 CE?

... that the largest known ovules produced by any non-flowering seed-plant came from the Medullosales (fossilized leaves pictured), an order of extinct seed ferns?
... that Hyptia deansi is the only fossil ensign wasp described from Mexican amber?
... that researchers have identified the pictured life form which no longer lives on this planet?
...that the cultures of the Western Mexico shaft tomb tradition not only considered dogs to be soul guides for the dead, but a major source of protein as well?
... that anthropologist Therkel Mathiassen described Comer's Midden as the only substantial find of pure Thule culture in Greenland?