ammonites
Dashanpu Dinosaur Quarry, Xiashaximiao (Jurassic to of China)

Where: Sichuan, China (29.4° N, 104.9° E: paleocoordinates 29.4° N, 109.6° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Xiashaximiao Formation, Bajocian to Bajocian (171.6 - 161.2 Ma)

• "from approximately the middle of the lower member of the Xiashaximiao Formation" (= Lower Shaximiao); Lower Shaximiao is suggested to be either Bajocian or Bathonian-Callovian in age

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; tabular, micaceous sandstone and blue mudstone

• "a lake-shore shallow-bank deposit under low energy conditions"
• "micro-grained feldspatholithic sandstone, which is rich in mica fragments, matrix interstitial. Wave-ripple cross bedding, micro-wavy bedding and medium- to large-scale tabular cross bedding are clearly seen."

Size classes: macrofossils, mesofossils

Collection methods: quarrying, mechanical,

Primary reference: X. He, D. Yan, and C. Su. 1983. A new pterosaur from the Middle Jurassic of Dashanpu, Zigong, Sichuan. Journal of the Chengdu College of Geology 1:27-33 [M. Carrano/M. Carrano/M. Carrano] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 24883: authorized by Matt Carrano, entered by Matt Carrano on 22.08.2002, edited by Philip Mannion and Roger Benson

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)