In 2020, the MS thesis of Samuel Garvey of the University of Cincinnati was published. The thesis focused on TMP 2014.011.0001, a "Tylosaurus" fossil in the collections of the Royal Tyrrell Museum consisting of a partial snout and a fragment of the right mandible. The specimen was found around northeast of Grande Prairie, Alberta; during the Cretaceous this locality was located at around 62° N, making the fossil the northernmost known occurrence of "Tylosaurus" and one of the few known occasions of a mosasaur existing in boreal climates. Moreover, the morphology of TMP 2014.011.0001 was recognized as very distinct from other "Tylosaurus" species. For example, it exhibited paedomorphosis in its teeth, which were slender and designed for piercing prey (contrary to the more robust cutting-specialized teeth of typical "Tylosaurus" species), a trait likely retained from juveniles. The uniqueness of the specimen led to the conclusion that it was a new species, which Garvey subsequently proposed that it be named "Tylosaurus borealis" in reference to its northernly occurrence.