chengjiang formation dating

They are mostly farmers and herders. Similar mud-eating habits were common among the hyoliths, a group of extinct animals which had a cone-shaped shell and an operculum to close the open end. The area was also extensively studied in the s and s Hou et al. The stage embraces four trilobite zones; in ascending order they are the Profallotaspis jakutensis Zone, the Fallotaspis Zone, the Pagetiellus anabaru s Zone, and the Judomiae Uktaspis Prouktaspis Zone. In general, I have given preference to the most common forms, and also to those which are also known from elsewhere, usually the Burgess Shale, or which shed light on interesting evolutionary events in main lineages such as the trilobites. Perhaps the most surprising aspect of the Chengjiang biota is the wealth of taxa from so many different groups. There is a public-access field station with a museum at Maotianshan and a new museum in Chengjiang town nearby where there are other services.

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