Ammonites lived during the periods of Earth history known as the Jurassic and Cretaceous. Together, these represent a time interval of about 140 million years.
The Jurassic Period began about 201 million years ago, and the Cretaceous ended about 66 million years ago. The ammonites became extinct at the end of the Cretaceous Period, at roughly the same time as the dinosaurs disappeared. However, we know a lot about them because they are commonly found as fossils, formed when the remains or traces of the animal became buried sediment that later solidified into rock.
圖片編號:
168329003
拍攝者:
Mickem
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授權類型 | 尺寸 | 像素 | 格式 | 點數 | |
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標準授權 | S | 591 x 800 | JPG | 15 | |
標準授權 | M | 1488 x 2014 | JPG | 18 | |
標準授權 | L | 1922 x 2601 | JPG | 20 | |
標準授權 | XL | 2431 x 3290 | JPG | 22 | |
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標準授權 | TIFF | 6275 x 8492 | TIF | 39 | |
進階授權 | WEL | 4437 x 6005 | JPG | 88 | |
進階授權 | PEL | 4437 x 6005 | JPG | 88 | |
進階授權 | UEL | 4437 x 6005 | JPG | 88 |
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XL
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標準授權 | 355 x 480 px | JPG | 13 點 |
標準授權 | 591 x 800 px | JPG | 15 點 |
標準授權 | 1488 x 2014 px | JPG | 18 點 |
標準授權 | 1922 x 2601 px | JPG | 20 點 |
標準授權 | 2431 x 3290 px | JPG | 22 點 |
標準授權 | 4437 x 6005 px | JPG | 23 點 |
標準授權 | 6275 x 8492 px | TIF | 39 點 |
進階授權 | 4437 x 6005 px | JPG | 88 點 |
進階授權 | 4437 x 6005 px | JPG | 88 點 |
進階授權 | 4437 x 6005 px | JPG | 88 點 |