Читать книгу The Handy Dinosaur Answer Book - Patricia Barnes-Svarney - Страница 93

The geologic time scale is not exact, and depending on the country or scientist, the dates of the Triassic period can vary by about 5 to 10 million years. On the average, the Triassic period is said to have lasted from about 250 to 205 million years, for a total of about 45 million years in length.