# Bituminous limestone

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'''Bituminous limestone''' is [limestone](/source/limestone) impregnated and sometimes deeply colored with [bituminous matter](/source/bitumen) derived from the decomposition of animal and plant remains entombed within the mass or in its vicinity.

==Uses==
The amount of bituminous matter or asphalt in the pores of the rock is sometimes sufficient to permit the material being used for asphalt pavements after simply powdering and heating it. Still better results are obtained by mixing it with [bituminous sandstone](/source/oil_sands).

==Sources==
In the [United States](/source/United_States), bituminous limestone has been found in [Oklahoma](/source/Oklahoma), [Texas](/source/Texas), and [Utah](/source/Utah). Much bituminous limestone was also mined in [Germany](/source/Germany), [Switzerland](/source/Switzerland), and [France](/source/France), from where large quantities of it were exported to the United States.

==Notes==
{{No inline citations|date=July 2013}}
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==References==
*{{NIE|wstitle=Bituminous Limestone|year=1905}}

Category:Limestone
Category:Bitumen-impregnated rocks

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Adapted from the Wikipedia article [Bituminous limestone](https://en.wikipedia.org/wiki/Bituminous_limestone) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Bituminous_limestone?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.