ナショナルジオグラフィックのインスタグラム(natgeo) - 5月13日 02時25分

@Robert Clark People may disagree but I think that this picture is a beautiful thing, not because of the photography or because it looks like a painting by a modern art master, but because of what it is, and how it relates to the earth and to the modern life that we all enjoy.
What is it?
It is a slice of rock from Canada, representing a span of 500,000 to 750,000 years, offers clues to what the world was like before, during, and after the meteor struck Earth. A. Before the impact (Cretaceous): The transition from pale mudstone to coal shows the climate shifting from dry to wet, perhaps stressing dinosaurs, other fauna, and flora. B. Impact (66 million years ago): No dinosaur fossils are found in or above this layer. Cracked quartz and rare metals such as iridium (scarce on Earth but plentiful in some meteorites) suggest a meteor strike. C. After the impact (Paleogene): Micro­fossils in coal indicate that forests collapsed and ferns took over.

Before the impact on the bottom of the rock is revealing a change in climate, shifting from a dry to wet environment. The center section where you can see the earth colored thin line is the time of the asteroid impact 66 million years ago, and the top section is a layer of the ash that covered the planet which leads to the death of most dinosaurs and the rise of Mammals.

Where does the name come from? The first segment of the Cenozoic Era, from 65 million years ago until the present, has historically been called the Tertiary Period. The abbreviation for the boundary between the Cretaceous and Tertiary periods is the K-T boundary, where K is the abbreviation for the German form of the word Cretaceous.

Thank you to the @RoyalTyrrell Museum......for allowing me to photograph this specimen. #Dinosaurs #mammals #astroid

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• Robert Clark
• RoyalTyrrell