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A major step in mammalian evolution was the shift amongst many herbivorous clades from a browsing diet of leaves to a grazing diet of grasses. This was associated with (1) major cooling and increasing continentality and the enormous spread of grasslands in most continents, replacing closed and open forests, and (2) hypsodonty, the possession of high-crowned teeth. Hypsodonty is traditionally linked...
Palaeontologists and others have been repeatedly amazed by reports of spectacularly well-preserved fossils from China, and one of the key sources has been the Jehol Biota of Liaoning, Hebei and Inner Mongolia in NE China. The Jehol Biota consists of three main horizons, the Dabeigou, Yixian and Jiufotang formations, spanning the late Hauterivian to early Aptian (131-120 Ma) of the Early Cretaceous...
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