Unit 6, Tongzhi Fm., Honghuayuan and Tongzhi, Guizhou Prov., China (Ordovician of China)

Where: Guizhou, China (28.0° N, 107.0° E: paleocoordinates 21.4° N, 143.4° E)

• local area-level geographic resolution

When: Tongzi Formation, Tremadoc (485.4 - 477.7 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: offshore shelf; lithified mudstone and limestone

• muddy shale and limestone

Primary reference: R. Wang. 1981. Stratigraphic Summary of the Southwestern Region of China. Institute of Geology and Mine Deposit at Chengdu, Ministry of Geology (not published, copy of article deposited with A. I. Miller at the University of Cincinnati, received through S. Mao) 14-61 [A. Miller/P. Novack-Gottshall]more details

PaleoDB collection 5279: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 12.09.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Asaphida - Hungaiidae
Dactylocephalus sp. Hsu 1948 trilobite
Rhynchonellata
 Orthida - Eoorthidae
Apheoorthis sp. Ulrich and Cooper 1936
[entered as Apheorthis sp.]
Lingulata
 Lingulida - Obolidae
Bivalvia
 Modiomorphida - Modiomorphidae
Modiolopsis sp. Hall 1847 clam
 Protobranchia -
Nuculites sp. Conrad 1841 clam