Sentences with phrase «old mudstone»
The nearly complete skeleton, unearthed from 160 - million - year - old mudstone deposits in northwestern China's Junggar Basin, extends the fossil record of alvarezsauroids back in time by a whopping 63 million years — making it about 15 million years older than the earliest known bird, Archaeopteryx.
http://science.sciencemag.org/ Not exact matches
Farley and his colleagues determined the age of the mudstone to be about 3.86 to 4.56 billion years old.