""A trace fossil is like the tracks of the organisms that used to be living before our time, and these ones belong to the Cambrian era, which is 400 to 500 million years ago," Dr. Mohamed El-Ghali, head of the research team told the Times of Oman."
Feel free to be the first
Please review the linked page for context.
If you can think of something better than this,
please add it to the database