the.com/bone bed

Geology's mass grave: a rock layer so packed with fossils it reads like a crime scene.

means A sedimentary layer unusually dense with fossilized bones or teeth, formed where remains accumulated faster than they could scatter or decay.

from Straightforward compound from geology — 'bone' plus 'bed,' the standard term for a rock layer or stratum (from Old English 'bedd,' something laid down). Bone beds form where currents, droughts, mass die-offs, or predator traps concentrated skeletal material in one place before burial, so the phrase is less metaphor than plain description: a bed made of bones, named by the geologists who first dug into one.

formation
mass death or mass accumulation over time
density
can hold thousands of bones per square meter
famous example
dinosaur national monument's cliff of bones
clue to
ancient floods, droughts, or predator traps
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