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Well-preserved fossils show ostrich relatives lived in North America 50 million years ago
fossils ostrich relatives North America 50 million years ago
2016/7/15
Exceedingly well-preserved bird fossil specimens dating 50 million years represent a new species that is a previously unknown relative of the modern-day ostrich, according to a new paper co-authored b...
Scientists have discovered the first-ever fossil evidence of monkeys from the North American landmass: a 21-million-year-old specimen that changes our understanding of the biological history of the co...
The Industrial Minerals Association of North America
ball clay barite bentonite borates calcium carbonate diatomite
2012/3/6
The Industrial Minerals Association - North America (IMA-NA) is the representative voice of companies which extract and process a vital and beneficial group of raw materials known as industrial minera...
Origin and Clay-Mineral Genesis of the Cretaceous/Tertiary Boundary Unit, Western Interior of North America
Claystone Ejecta Glass alteration Halloysite Kaolinite K/T boundary unit Meteorite impact SEM XRD
2011/12/1
Abstract: A 3-cm-thick, two-layered clay unit that records mineralogic and textural evidence of a catastrophic event that occurred at a time now marked as the end of the Cretaceous Period was preserve...