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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Walcott-Rust quarry is an excellent example of an obrution (rapid burial or "smothered") Lagerstätten. Unique preservation of trilobite appendages resulted from early consolidation (cementation) of the surrounding rock, followed by spar filling of the interior cavity within the appendages. The presence of so many well preserved trilobites in one location alone qualifies the beds as an exceptional trilobite site, but the beds are further distinguished as the source of the first trilobites for which appendages were definitively described.