Oiled ebony pics

For many of us it's a black, molasseslike lake with preserved saber-toothed tigers. Tar pits are better known as oil sands , tar sands and bituminous sands , and they aren't only of interest to scientists -- they're also of great interest to energy companies. But just like the name suggests, this black gold doesn't gush from a geyser; it's actually in the sand itself. Oil sands are a mixture of roughly 90 percent clay, sand and water , with 10 percent bitumen [source: Grist ]. The dark, sticky sands look similar to topsoil, are viscous when warm and freeze as solid as concrete in cold temperatures. But calling them "tar" pits or "tar" sands is misleading -- the thick black substance isn't tar, but rather bitumen.

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