Chengjiang biota

The Chengjiang biota is an early Cambrian fossil assemblage in Yunnan, China, preserving diverse animals, including soft-bodied forms, from about 518 million years ago.

Maotianshan Shales: A Lower Cambrian fossil-bearing rock unit in Yunnan, China, famous for exceptionally preserved fossils. These shales contain the principal fossil beds of the Chengjiang biota.
Burgess Shale-type preservation: Fossil preservation in fine-grained marine deposits that retains soft tissues or their outlines, often as carbonaceous films. Chengjiang belongs to this wider style of soft-tissue preservation.
Hou Xianguang: A Chinese paleontologist who discovered and described the Chengjiang fossil assemblage in the 1980s. His fieldwork brought the assemblage to scientific attention.
Cambrian diversification: The rapid expansion of animal diversity and ecological forms during the Cambrian Period. Chengjiang documents diverse body plans and ecological roles early in this expansion.
Fuxianhuia: An extinct arthropod-like animal known from Cambrian fossils, including exceptionally preserved specimens from Chengjiang. Its fossils preserve complex anatomy that illuminates early arthropod evolution.
Taphonomy: The study of how organisms decay, become buried, and are preserved as fossils. Taphonomic processes explain which Chengjiang organisms and body parts survived.
Cambrian: The first period of the Paleozoic Era, lasting approximately 539 to 487 million years ago. Chengjiang fossils date to the early part of this geological period.
Animal phyla: The major evolutionary lineages into which animals are classified, such as arthropods and chordates. Chengjiang fossils provide evidence for the early histories of several animal lineages.
Haikouella: A small Cambrian animal from Chengjiang with features interpreted as chordate-like, though its affinities remain debated. It exemplifies how Chengjiang fossils inform—and complicate—early vertebrate origins.
Anoxic conditions: Environmental conditions in which oxygen is absent or severely depleted. Low oxygen may have slowed decay in some Chengjiang burial settings.

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