The famous K-Pg Boundary is scattered throughout the world. This boundary contains a higher concentration of iridium than terrestrial materials. High amounts of iridium are considered to be the "signature" for asteroidal impact, and has been linked to the Chicxulub Event and the extinction event linked to the demise of the age of dinosaurs.
Vulcanism could be a source of some of the iridium, but to have provided enough of this element to give the concentrations found uniformly worldwide in boundary clays, would have involved a degree of volcanic activity far beyond a logical scope. Even the basalts of the Deccan Traps in India, proposed by some to have been a source of such iridium, contain only 0.005 ppb of this element.
The discovery of the K-Pg iridium anomaly at Gubbio is considered to be one of the most important discoveries in evolutionary science. It was also central to the recognition by scientists that occasional catastrophic events like great impacts require a rejection of strict uniformitarianism in geology.
The Stevns-Klint in Denmark has a thin clay layer called the Fish Clay, which is between the Maastrichtian chalk and Danian Cerithium Limestone, and marks the Maastrichtian-Danian interval. The background iridium level at the Stevns-Klint is as high as 160pbb. Gubbio has concentrations of 9 ppb, and Spain, as high as 450 pbb. The amount of ppb's of iridium in various K-Pg boundaries around the world vary. The original impact crater’s origin is Chicxulub, off the Yucatan peninsula.
Ships with tag, information, display case and Certificate of Authenticity.
Collected by a geological professional, circa 2004.
Size: 48 mm H X 50mm W X 30mm D
This is a premium specimen from this famous K-Pg site!
Display base and cube not included. Tag stand is included.
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