ବିବରଣୀBrachiopods with U.S. quarter (Photo by John Mortimore).jpg
English: Three small brachiopods shown next to a U.S. quarter, photo by John Mortimore
Other information
Fossils were found in limestone gravel
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I took three photos of brachiopods, that I found, on black construction paper. Then I used paint.exe to combine them. (No re-sizing, all photos are too scale with U.S. quarter )
Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).