When large coastal diatom blooms die and sink to the bottom, they can be buried under sediments and later compressed during rock formation, which squeezes out the oil, forming pools of oil under sections of impermeable rock.
(large coastal diatom blooms; die; ) (large coastal diatom blooms; sink; to the bottom) (they; can be buried; under sediments; T:When large coastal diatom blooms die and sink to the bottom) (they; compressed; T:during rock formation; T:later) (rock formation; squeezes out; the oil)
large coastal diatom blooms large coastal diatom blooms they they rock formation
die sink can be buried compressed squeezes out
to the bottom
under sediments T:When large coastal diatom blooms die and sink to the bottom
T:during rock formation T:later
the oil