- - fuel source for fracking
- - Potential oil source
- - Emergency oil source
- - One source of oil
- - Rock source of petroleum
- - Fuel oil source
- - Oil source has damaged the French
- - Fossil source
- - Oil source has excited the French
- - Petroleum source
- - Source of gas market includes hydrogen
- - Possible source of petroleum
- - Kerosene source
- - A source of oil
- - Source of oil
- - Synfuel source
- - Source of kerosene
- - Source of aluminum
- - An oil source
- - Slate source
- - Oil source
- - be quiet with a beer or a mineral
- - Soft rock (rhymes with "whale")
- - A strong leader and hearty too, perhaps, with many layers.
- - a type of gas extracted by fracking.
- - readily-splitting clay rock
- - sedimentary rock well suited to preserving fossils
- - Rock involved in fracking
- - clay rock
- - Have a quiet beer then rock!
- - Stratified stone
- - Rock used in fracking
- - Rock that can be heated to produce oil
- - Rock fracked for gas
- - Oil yielder
- - It's formed by clay hardening
- - Fracking rock
- - Fracked rock
- - Earth's crust, mostly
- - Compressed clays
- - Clay-based rock
- - Clay product.
- - Type of rock
- - Easily split rock
- - Rock in which fossils can be found
- - Oil-producing rock
- - Sedimentary rock
- - Rock formed from clay
- - Frackable rock
- - Some mudrock
- - Fuel-yielding rock
- - Rock that's 'fracked'
- - Oil-yielding rock
- - Fissile rock
- - Product of clay compaction
- - Easily cleaved rock
- - Rock from which slate is formed
- - Oil-yielding mineral
- - Oil-bearing rock
- - Fossil-yielding rock
- - Layered sedimentary rock
- - Fossil-yielding sedimentary rock
- - Fracking target
- - Layered rock
- - Something fracked in fracking
- - Mud, after compaction
- - Fracking material
- - Easily split layered rock
- - Rock hotel in auction
- - Hardly hard rock?
- - Flagstone material
- - Easily-split sedimentary rock
- - Laminated rock
- - Something settled long ago?
- - Mineral layer involved in fracking
- - Thin-layered rock
- - Compressed clay
- - Fine-grained sedimentary rock
- - Rock used for flagstones
- - Rock that may yield oil
- - Product of mud compaction
- - Fossil holder
- - Rock often containing quartz
- - Oil-rich mineral
- - Fine-grained rock
- - Most common sedimentary rock
- - Layered fissile rock
- - Slate, originally
- - Rock that splits easily
- - Rock made from layered mud
- - River-delta material
- - Rock made in layers
- - Common fossil rock
- - Stratified rock
- - Shelf material
- - Mudstone, e.g.
- - Mud, after centuries
- - Oily rock
- - Claylike rock
- - Fossil medium
- - Sedimentary stuff
- - Brick ingredient
- - Rock made into flagstones
- - Not exactly hard rock?
- - Mudstone
- - Oil rock
- - Rock that may hold fossils
- - Laminar rock
- - Flaky rock
- - Grained rock
- - Kind of oil
- - Clayey rock
- - Oily stone
- - Fragile layered rock
- - Cleavable rock
- - Rock that splits into bits
- - Argillaceous rock
- - Oil
- - Kind of rock
- - Type of oil
- - Soft rock?
- - dark fine-grained sedimentary rock composed of layers of compressed clay, mud or silt
- - auction includes hard rock
- - quiet beer is what produces gas?
- - Fossil rock
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- [ Other definitions ]