September, 2000: The Mazon Creek Nodules ...concretions formed in 300 million-year-old Illinois coal swamps yield flawless plants and insects.
(concretions; formed; L:in 300 million-year-old Illinois coal swamps) (The Mazon Creek Nodules; yield; flawless plants and insects)
concretions The Mazon Creek Nodules
formed yield
L:in 300 million-year-old Illinois coal swamps
flawless plants and insects