Dinosaur Egg Sites

Nanxiong Basin

Nanxiong Basin is a NE-SW elongated intermontane basin located in norhtern Guangdong and southern Jiangxi provinces. The strata exposed at the basin are divided into three groups:

(1) The Upper Cretaceous Nanxiong Group consists of the Yuanpu Formation (fan-glomerate, fluviolacustrine, and lacustrine facies) and Pingling Formation (fluvial deposits).

(2) The early Tertiary Loufuzhai Group is darker colored and foner grained than the Nanxiong Group, and is made up of the Shanghu, Nonshan, and Gucheng formations.

(3) The overlying Danxia Group is a suite of coarse, sandy conglomerate.

Dinosaur eggs and fossil mammals were first found at the basin in 1961. Over 1,000 more or less complete eggs and more than 40,000 eggshell fragments have been collected. Fossil eggs are restricted to the middle ad uppermost parts of Yuanpu Formation, and throughout the Pingling Formation. The egg fauna consists of the following taxa (Zhao Z. K., 1993):

Elongatoolithidae Zhao, 1975

Macroolithus yaotunensis Zhao, 1975

Macroolithus rugustus Young, 1965

Macroolithus sp. nov.

Elongatoolithus andrewsi Zhao, 1975

Elongatoolithus elongatus Young, 1954

Elongatoolithus sp. nov.

Nanshiungoolithus chuetienensis Zhao, 1975

Spheroolithidae Zhao, 1975

Ovaloolithus cf. O. chinkangkouensis Zhao and Jiang, 1974

Ovaloolithus cf. O. laminadermus, Zhao and Jiang, 1974

Ovaloolithus sp. nov.

Shixingoolithus erbeni Zhao et al., 1991

Fam. indet.

Stromatoolithus pinglingensis Zhao et al., 1991

The Nanxiong Group contains four dinosaurian bones: Tarvosaurus sp., Nanshiungosaurus brevispinus, Nemegtosaurus sp., and Microhadrosaurus nanshiungensis, as well as a large turtle -- Nanshiungchelys Wuchingensis.

K/T boundary: Different characteristics below and above the boundary --

Above the boundary Petrology dark red siltstone with large calcareous concretions and fossil record of mammal fauna . Below the boundary is purplish red siltstone with small calcareous concretions and fossil record of dinosaur eggs and bones.

Zhao and others' study of eggshell structures, trace elements and O, C isotopes suggests that environmental change and more arid climage is the main reason why dinosaurs became extinct.


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