7 km west of Dongzhi, Hunghuayuan Fm ( of China)

Where: Jianxin, China (30.1° N, 117.0° E: paleocoordinates 11.9° N, 138.3° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Hunghuayuan Formation, Tremadoc to Tremadoc (486.5 - 470.0 Ma)

• late Tremadocian to early Floian, belonging to TS1d-2a (sensu Webby et al., 2004) (Cao et al., 2009)

Environment/lithology: reef, buildup or bioherm; gray, cherty/siliceous limestone

• Formation - dark gray to gray skeletal grainstones to packstones (that include abundant skeletal organisms such as pelmatozoans, trilobites, brachiopods, gastropods, cephalopods, and the problematicum Nuia, mudstones, and the dominant reefal limestones that are made up mainly of microbialites (mostly stromatolites), lithistid sponges, and receptaculitids, conodont.
• bioclastic limestone

Size classes: macrofossils, mesofossils

Primary reference: N. Adachi, Y. Ezaki, J. Liu and J. Cao. 2009. Early Ordovician reef construction in Anhui Province, South China: A geobiological transition from microbial- to metazoan-dominant reefs. Sedimentary Geology 220:1-11 [W. Kiessling/M. Krause]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 154811: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 14.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Hormogoneae
 Oscillatoriales - Girvanellaceae
Girvanella sp.
Girvanella sp. Nicholson and Etheridge 1878
Demospongiae
 Lithistida -
Lithistida indet.
Lithistida indet. Schmidt 1870 demosponge
Radiocyatha
  - Soanitidae
Calathium sp.
Calathium sp. Billings 1865
Epiphyton
  - Ludloviaceae
Epiphyton sp.
Epiphyton sp. Bornemann 1886
Florideophyceae
 Corallinales - Corallinophycidae
Halysis sp.
Halysis sp. Hoeg 1932
Rhodophyceae
  -
Angulocellularia sp.
Angulocellularia sp. Vologdin 1962
Nuia
  -
Nuia sp.
Nuia sp. Maslov 1954