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Answer:
SHALE
Possible Questions:
Oil source
Kind of rock
Type of oil
Kind of oil
Fissile rock
Layered rock
Oil-bearing rock
Sedimentary rock
Easily split rock
___ oil
Laminated rock
Fine-grained rock
Petroleum source
Type of rock
An oil source
One source of oil
Oil-yielding rock
Fine-grained sedimentary rock
Source of oil
Possible source of petroleum
Fuel-yielding rock
Fossil-yielding rock
Compressed clay
A source of oil
Thin-layered rock
Synfuel source
Stratified rock
Shelf material
Rock that splits easily
Rock made from layered mud
Product of mud compaction
Oil-producing rock
Not exactly hard rock?
Mud, after centuries
Fossil source
Clayey rock
Thin layered rock
Source of kerosene
Slate, originally
Slate source
Rock used in fracking
Rock used for flagstones
Rock that splits into bits
Rock that may yield oil
Rock that may hold fossils
Rock often containing quartz
River-delta material
Potential oil source
Oily stone
Oil-rich mineral
Oil yielder
Oil rock
Mudstone, e.g.
Mudstone
Most common sedimentary rock
Layered fissile rock
Kerosene source
It's formed by clay hardening
Fragile layered rock
Fracking target
Fracking rock
Fossil medium
Fossil holder
Emergency oil source
Compressed clays
Cleavable rock
Clay product
Brick ingredient
Argillaceous rock