Middle Jurassic floras of Mongolia: Composition, age, and phytogeographic position

Floras of Oshin-Boro-Udzyur-Ula, Tsagan-Ovoo, and Nariin-Sukhait of Mongolia are reviewed. Their composition suggests a Middle Jurassic age for these floras. They resemble the synchronous floras of the West Siberian Province of the Siberian Paleofloristic Region. The boundary between this province and North Chinese Province of the same region should be drawn further to the south than was previously thought. The Middle Jurassic floras of Mongolia existed in a warm temperate, humid climate.