Crossword Heaven

Answer: SHALE

SHALE is a crossword puzzle answer that we have spotted 74 times.

• Kind of oil
• Oil source
• Synfuel source
• Rock that may hold fossils
• Mudstone
• Petroleum source
• Brick ingredient
• Fossil medium
• Shelf material
• Fossil-yielding rock
• Fossil source
• Slate, originally
• Oil-yielding rock
• Fissile rock
• Sedimentary rock
• Thin-layered rock
• Source of oil
• Source of kerosene
• Oil-bearing rock
• River-delta material
• Fuel-yielding rock
• A source of oil
• Laminated rock
• Stratified rock
• Easily split rock
• Rock that splits easily
• Layered rock
• Rock made from layered mud
• Mud, after centuries
• Fine-grained rock
• Oil-producing rock
• Layered fissile rock
• Fine-grained sedimentary rock
• Most common sedimentary rock
• Slate source
• Clay product
• Oily rock
• Product of mud compaction
• Rock often containing quartz
• Scaly stone
• Fossil holder
• Kerosene source
• Possible source of petroleum
• Rock that may yield oil
• Fracking rock
• Rock used for flagstones
• Compressed clay
• Fracking target
• Mineral layer involved in fracking
• Something settled long ago?
• Flagstone material
• Hardly hard rock?
• Fracking material
• Rock that's "fracked"
• ___ oil
• Something fracked in fracking
• *Sedimentary rock
• Fuel oil source
• Fossil-yielding sedimentary rock
• Clayey rock
• Oil-yielding mineral
• Rock from which slate is formed
• Easily cleaved rock
• Clay-based rock
• Some mudrock
• Earth's crust, mostly
• Rock
• Rock in which fossils can be found
• Rock source of petroleum
• Thin-layered sedimentary rock
• One source of oil
• Rock involved in fracking
• Flaky rock
• Burgess ___ (rock bed noted for its fossils)