The earliest known avialan fossils come from the tiaojishan formation of china which has been dated to the late jurassic period oxfordian stage about 160 million years ago the avialan species from this time period include anchiornis huxleyi xiaotingia zhengi and aurornis xui the wellknown early avialan archaeopteryx dates from slightly.
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bird species richness in the western hemisphere hawkins et al 2006 bird species diversity in new york state.