Cretaceous Gallery
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Choose from 25 pictures in our Cretaceous collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.
Dinosaur excavation - excavating a Hadrosaur skeleton. Upper
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Featured Image
FG-EA-733
FG-ea-733
GEOLOGY: K-T boundary - Sample of the K-T boundary claystone from the Sussex locality, Wyoming, USA
Sample is 18 mm thick. The very top part is a fragile laminated carbonaceous layer containing grains of sand (quartz). Many of them present the mulitple fracture lines created by the impact ("shocked quartz").
Francois Gohier
© Francois Gohier / ardea.com
Featured Image
FG-CB-432
FG-CB-432
Dinosaurs - Geology: the Cretaceous - Tertiary boundary (KT boundary)
Location: Red Deer River Valley, north of Drumheller, Alberta, Canada.
Sixty five million years ago an asteroid or comet collided with Earth at the tip of the Yucatan Peninsula. The material ejected from Earth as a result of the impact (pulverised terrestrial rocks and pulverised fragments of the bolide) fell back to earth, forming a thin layer that has been found at many sites around the world. It is usually a one to two-centimeter thick layer of clay, rich in the element iridium. Many paleontologists think the global catastrophy triggered by the impact caused the extinction of the dinosaurs as well as of many marine reptiles and invertebrates. On this photograph the boundary clay layer is indicated by the bottom tip of the pen.
Francois Gohier
© Francois Gohier / ardea.com
