Terrestrial Large Mammals
Mostrando 13-14 de 14 artigos, teses e dissertações.
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13. The location of Z- and W-linked marker genes and sequence on the homomorphic sex chromosomes of the ostrich and the emu
Perhaps the most striking fact about early Cenozoic avian history some 70 million years ago was the rapid radiation of large, flightless, ground-living birds. It has been suggested that, for a time, there was active competition between these large terrestrial birds and the early mammals. Probably reflecting the above noted early start of Ratitae of the infra
The National Academy of Sciences.
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14. High-precision 40Ar/39Ar geochronology and the advent of North America’s Late Cretaceous terrestrial fauna
A densely sampled, diverse new fauna from the uppermost Cedar Mountain Formation, Utah, indicates that the basic pattern of faunal composition for the Late Cretaceous of North America was already established by the Albian-Cenomanian boundary. Multiple, concordant 40Ar/39Ar determinations from a volcanic ash associated with the fauna have an average age of 98
The National Academy of Sciences of the USA.