![](http://www.alamy.com/thumbs/6/C79E7826-3B86-475E-ACCE-D93CB3472C9B/J1FNN7.jpg)
Leesburg limstone conglomerate, sedimentary rock, Frederick county, Maryland, in situ
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Photo credit: © John Cancalosi / Alamy / Afripics
License: Licensed
Model Released: No
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