Aurora elders from watching or interpreting the messages of ancestors they believed were transmitted through an aurora. "[[Bulfinch's Mythology]]" relates that in [[Norse mythology]], the armour of the [[Valkyrie|Valkyrior]] "sheds a strange flickering light, which flashes up over the northern skies, making what Men call the 'aurora borealis', or 'Northern Lights' ". There appears to be no evidence in [[Old Norse literature]] to substantiate this assertion. The first Old Norse account of "norðrljós" is found in the Norwegian chronicle "[[Konungs Skuggsjá]]" from AD 1230. The chronicler has heard about this phenomenon from compatriots returning from [[Greenland]], and he gives three possible
Dimetrodon borealis the sabre-armed jaws completed the sanguinary work of destruction." American paleontologist E. C. Case reclassified "Bathygnathus" as a pelycosaur (a type of "mammal-like reptile") in 1905, noting its similarities with the genus "Dimetrodon", a sail-backed synapsid that was discovered in Texas in the 1870s. In their 1940 overview of pelycosaurs, Alfred Romer and Llewellyn Ivor Price suggested that "Bathygnathus" might be synonymous with "Dimetrodon". Dimetrodon borealis Dimetrodon borealis, formerly known as "Bathygnathus borealis," is an extinct species of pelycosaur-grade synapsid that lived about 270 million years ago (Ma) in the Early Permian. A partial maxilla or upper jaw bone from