These revealed that underlying strata were bituminous limestone containing up to 20 percent blackish oils.
2.
In the 1870s, Claridge's company took over asphalt production at Pyrimont Wharf, in Cubitt Town . " The manufacturing process employed at Cubitt Town involved the heating of bituminous limestone in six large uncovered cauldrons, producing vapours considered offensive by many local residents.
3.
At first, the only known occurrence of this mineral was in the famous emerald mine at Muzo in Colombia, South America, where it was found by J . J . Paris, who rediscovered and worked the mine in the early part of the 19th century; here it is associated with emerald in a bituminous limestone of Cretaceous age.
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