Kt boundary dating
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Based on the historical eyewitness account recorded in the Bible, we know that dinosaurs buried in the Cretaceous and other layers of sedimentary rock below this level represent many of those that died in the global Flood less than 4,500 years ago.And while there are billions of dead things buried in these layers, since dinosaurs and other air-breathing animals were preserved on Noah’s Ark, they did not become extinct until later, after the Flood.
Dinosaurs first appeared in the Early Triassic, but large amphibians and mammal-like reptiles were the dominant land animals.“The impact was clearly the final straw that pushed Earth past the tipping point,” says Renne. Below it, in Cretaceous (“K”) rock, are dinosaur fossils.“We have shown that these events are synchronous to within a gnat’s eyebrow, and therefore the impact clearly played a major role in extinctions, but it probably wasn’t just the impact. Above it—past the “K-T” boundary in the “Tertiary” (“T”)1 rocks, there are none.The rapid mass extinction that occurred 201 million years ago changed that.After the debris from the impact settled back on Earth, however, it settled in a layer known as the 'K-T boundary' between the Cretaceous and Tertiary periods, which contains the iridium-enriched dust.“Many people think precision is just about adding another decimal place to a number. But even the latest dating method assigning it a precise date of 66,038,000 (give or take 11,000) years ago are based on unverifiable assumptions.
Image by NASA/JPL-Caltech, modified by David Fuchs, from Wikimedia Commons.
Evolutionary scientists believe the geologic column represents the time various animals evolved and went extinct over millions of years.
Because dinosaurs and many other organisms do not appear above the K-T boundary, evolutionary scientists believe the K-T boundary represents one of several “mass extinction” events.
This evidence suggests they died at the same time as a result of an asteroid impact in Mexico (illustrated) and their bodies sunk to the bottom of the shallow sea In the Cretaceous period, when T-rex famously roamed the Earth, the site was a shallow sea some 10 miles (16km) from an ancient mountain range.
An image showing excavations in the quarry is shown above The first of the traditional big five extinction events, around 440 million years ago, was probably the second most severe.
The geologic table is a list of the names of earth’s rock layers.