The Geological Society of America

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The Geological Society of America provides access to elements that are essential to the professional growth of earth scientists at all levels of expertise and from all sectors: academic, government, business, and industry.
Presence of the dinosaur Scelidosaurus indicates Jurassic age for the Kayenta Formation (Glen Canyon Group, northern Arizona)
Kevin Padian
Geology(1989), 17(5):438
http://dx.doi.org/10.1130/0091-7613(1989)017<0438:POTDSI>2.3.CO;2

The Geological Society of America
The Geological Society of America
GeoScienceWorld
GeoScience World