Also known as Reef 4044
Where: Guizhou, China (27.5° N, 109.0° E: paleocoordinates 19.1° N, 139.9° E)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Hunghuayuan Formation, Tremadoc to Tremadoc (486.5 - 470.0 Ma)
• TS1d–2a of the Ordovician time-slice system (Webby et al. 2004).
•Late Tremadoc - Early Floian
• formation-level stratigraphic resolution
Environment/lithology: reef, buildup or bioherm; gray grainstone and packstone
•
•The small-scaled reefs are generally domical or lenticular in shape, ranging in height from tens of centimeters to several meters, and in width from less than a meter to more than 10 m. They are chiefly built by benthic microbes, lithistid sponges, the quasi-sponge fossils Calathium as well as bryozoans and are usually surrounded by skeletal/intraclastic grainstones and packstones. Skeletal fragments of ostracods, trilobites, gastropods, brachiopods, nautiloids, and echinoderms are found within the reefs and surrounding sediments. Three reefal types are recognized.
•peloidal limestones; bioclastic packstones
Size classes: macrofossils, mesofossils
Primary reference: Q. Li, Y. Li, and W. Kiessling. 2014. Early Ordovician sponge-Calathium-microbial reefs on the Yangtze Platform margin of the South China Block. gff [W. Kiessling/M. Krause]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 154810: authorized by Wolfgang Kiessling, entered by Mihaela Krause on 14.03.2014, edited by Qijian Li
Creative Commons license: CC BY (attribution)
Taxonomic list
| Nuia | |
|
Nuia sp. Maslov 1954 | |
| Hormogoneae | |
|
Girvanella sp. Nicholson and Etheridge 1878 | |
| Radiocyatha | |
|
Calathium sp. Billings 1865 | |
| Stromatoporoidea | |
|
Cystostroma primordia Jeon et al. 2018 stromatoporoid sponge | |
| Demospongiae | |
|
Lithistida indet. Schmidt 1870 demosponge | |