Oil source (5 letters)

{ Answer }

SHALE

{ Related Clues }

___ oil
Clayey rock
Fissile rock
Kind of oil
Laminated rock
Layered rock
Oil yielder
Oily stone
Shelf material
Slate, originally
A source of oil
One source of oil
Source of oil
Synfuel source
Easily split rock
Fine-grained rock
Fragile layered rock
Oil-producing rock
Rock that splits into bits

{ Tags }

bits, easily, fine, fissile, flagstones, fossil, fragile, grained, into, kind, laminated, layered, oil, potential, producing, rock, shale, source, split, splits, yielding

{ Notes }

The answer SHALE is common and appears about once every 225 puzzles.

{ Definition }

SHALE as a noun:

1. a sedimentary rock formed by the deposition of successive layers of clay