Gap in <a href="https://en.wikipedia.org/wiki/limestone" class="extiw" title="w:limestone">limestone</a> cliffs at abandoned Martin-Marietta rock quarry.
<p>Rock from the quarry would have passed through this gap to be loaded onto trucks or barges.
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near Utica, Indiana.
Mar. 1988.
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file # 88c130.
35 mm Kodachrome.
Plustek OpticFilm 7600i.
Siverfast 8.
Picture Window 6.
unsharp mask (radius 1,threshold 3, 90%).
</p>
JPEG quality 95.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70020260@N04">William Alden</a> from Louisville, Kentucky, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bill_alden/27804585482/">88c130: Gap in cliffs at abandoned quarry near Utica, Indiana</a>