[5] In 2017, Nancy Muleady-Mecham of Northern Arizona University, after extensive research with original documents in Austria, claimed to find a positive link to the person Sequoyah (the inventor of the Cherokee writing system) and Endlicher, as well as information that the use of the Latin sequor would not have been correct.The alleged positive link is based on a similarity in pronunciation of the words "Sequoyah" and "Sequoia": valid to persons that think in English, but not those that think in German or Latin.[citation needed] Sequoia ancestors were not dominant in the tropical high northern latitudes, like Metasequoia, a redwood whose deciduous habit gave it a significant adaptive advantage in an environment with 3 months of continuous darkness.[12] Pollen sampling of sediments found in Hungary indicates the local extinction of genus Sequoia approximately 2.7 million years ago in the first part of the Pliocene.[13] In western North America it continued to move south through coastal Oregon and California, surviving due to the abundant rainfall and mild seasons.