Xiaping, Horizon D, Southeastern Hunan (Jurassic of China)

Where: China (25.7° N, 113.2° E: paleocoordinates 35.4° N, 118.2° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Xintianmen Formation, Early/Lower Sinemurian (196.5 - 189.6 Ma)

• Horizon D belongs to the upper Xintianmen Formation and is of early Sinemurian age.

• bed-level stratigraphic resolution

Environment/lithology: transition zone or lower shoreface; lithified sandstone

• This succession of the Xintianmen Formation consists of shallow-marine, siliciclastic deposits. Frequent occurence of lenticular beddings and ripples of different kinds in the mudstones, as well as sandstone layers overlying erosional surfaces indicate that the deposition took place above the storm wave base, probably in near-shore environments. The latter is also indicated by the frequent occurence of remains of land plants. Some characteristics of horizon D let assume an occasionally storm-influenced shallow-marine environment.
• In the Xintianmen Formation, well layered sandstones and mudstones alternate. Marine invertebrates occur in a few horizons only, in mudstones as well as sandstones. The horizon D consists of light grey to yellowish and yellowish-brown sandstone, fairly hard in some parts, but more or less crumbly in others, and contains white mica.

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: F. Stiller. 2006. Early Jurassic shallow-marine bivalves from Xiaping, southern Hunan, China. Palaeontographica Abteilung A 274(1-2):1-70 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 59624: authorized by Martin Aberhan, entered by Sabine Nürnberg on 05.04.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Mollusca indet.
Mollusca indet. Linnaeus 1758
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Bivalvia
 Cardiida - Cardiidae
Protocardia cf. moshuiwanensis
 Carditida - Cardiniidae
Torastarte ruchengensis
 Trigoniida - Trigoniidae
Liotrigonia hunanensis
 Arcida - Parallelodontidae
Cosmetodon xiapingensis n. sp., Cosmetodon xintianmenensis n. sp.
Cosmetodon xiapingensis n. sp. clam
>40
Cosmetodon xintianmenensis n. sp. clam
>60
 Ichnofossils -
Talpina hunanensis