Dinosaurs - Geology: the Cretaceous-Tertiary boundary

Dinosaurs - Geology: the Cretaceous-Tertiary boundary (KT boundary). The site is in the Red Deer River Valley, 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 tip of the hammer rests on the boundary clay layer

Boundary Cretaceous Dinosaur Dinosaurs Fossil Fossils Palaeontology Prehistoric Tertiary Tools

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