Ragiv:Dinosaur track.jpg

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Eubrontes, a footprint of a theropod dinosaur, preserved in reddish sandstones of the Moenave Formation (Lower Jurassic), near Tuba City, north of Flagstaff, Arizona.[1] Scale: The coin is a US quarter dollar (25¢, diameter: 24.26 mm, 0.955 in) comparable in size to a 50 euro cent coin. Hence, the maximum width of the footprint is about 30 cm (1 ft).

  1. see pictures at dinodomain.com at the Wayback Machine; Note: The whole domain is for sale now and there was only one picture of the original webpage archived, but it clearly shows the imprint in question, inferrable from the adjacent surface features of the rock.
Dät
Fon http://pdphoto.org
Lautan Jon Sullivan

Dälastad

Public domain This work has been released into the public domain by its author, Jon Sullivan (PD Photo.org). This applies worldwide.
In some countries this may not be legally possible; if so:
Jon Sullivan (PD Photo.org) grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

Details
pdphoto.org Public domain This image from PD Photo.org has been released into the public domain by its author and copyright holder, Jon Sullivan.

From the photo page: This work is dedicated to the Public Domain. For non-US use it is also placed under a Creative Commons CC0 designation.

Sullivan has stated: "You may use this image for any purpose, including commercial. As the owner I have explicitly placed it in the public domain. If you do use it, please consider linking back to pdphoto.org. Use it for whatever you want. Use it all. Sell it. Mangle it. Whatever you want. Please. But it would be polite to let me know so I can at least enjoy whatever creative use you're putting it to. This doesn't mean that you can take the material and then copyright it yourself. It’s in the public domain and that’s where I want it to stay."

Attention: not all pictures from pdphoto.org are in public domain! Please check the metadata on the source before applying this license tag.

This image has currency in it to indicate scale.

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).

Images with coins to indicate scale

Common coin diameters for reference:

  • U.S. dollar (as of?):
    • 1¢: 19.05 mm, 0.75 in
    • 5¢: 21.21 mm, 0.84 in
    • 10¢: 17.91 mm, 0.71 in
    • 25¢: 24.26 mm, 0.94 in
    • 50¢: 30.61 mm, 1.22 in
    • $1: 26.5 mm, 1.02 in
  • Canadian dollar (as of?):
    • 1¢: 19.05 mm, 0.75 in
    • 5¢: 21.2 mm, 0.83 in
    • 10¢: 18.03 mm, 0.71 in
    • 25¢: 23.88 mm, 0.94 in
    • 50¢: 27.13 mm, 1.07 in
    • $1: 26.5 mm, 1.02 in
    • $2: 28 mm, 1.1 in
  • Pound sterling as of 2021:
    • 1p: 20.32 mm, 0.8 in
    • 2p: 25.91 mm, 1.02 in
    • 5p: 18 mm, 0.71 in
    • 10p: 24.5 mm, 0.96 in
    • 20p: 21.4 mm, 0.84 in
    • 50p: 27.3 mm, 1.07 in
    • £1: 23.03–23.43 mm, 0.91–0.92 in
    • £2: 28.4 mm, 1.12 in
  • Euro as of 2002:
    • 1c: 16.25 mm, 0.64 in
    • 2c: 18.75 mm, 0.74 in
    • 5c: 21.25 mm, 0.84 in
    • 10c: 19.75 mm, 0.78 in
    • 20c: 22.25 mm, 0.88 in
    • 50c: 24.25 mm, 0.95 in
    • €1: 23.25 mm, 0.92 in
    • €2: 25.75 mm, 1.01 in

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inception Linglänapük

19 yanul 2003

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Dät/TimMagodilMafotsGebanKüpet
anuik11:46, 2006 yanul 17idMagodil fomama tü 11:46, 2006 yanul 17id1,024 × 768 (149 KB)Gang65This is propably Tyrannosaurus rex tracks. The picture was taken from: http://pdphoto.org/PictureDetail.php?mat=pdef&pg=5493 I don't know which licence I should check.

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