the National Natural Science Foundation of China (Grant Nos.40072041, 49472086), SSER project of Ministry of Science and Technology of China, and the National Science Foundation of USA.
Ichnosedimentologic evidence of periodic anoxic shelf in the Early-Middle Ordovician transition includes lower ichnodiversity, shallower bioturbation and burrowing depth (<4 cm), rare domichnia, tinyChondrites occu...