Yanguoxia Fm
Period:
Cretaceous
Age Interval:
Early Cretaceous, (14a)
Province:
Gansu, Qinghai
Lithology and Thickness
"Yanguoxia Formation is mainly comprised of red sandstone, siltstone and thick sequence of variegated colors of shales. This formation preserved dinosaur fossils, dinosaur footprints, etc." Details and images at: https://www.researchgate.net/publication/327499714_Petrography_geochemistry_and_provenance_of_the_sediments_of_the_Early_Cretaceous_Yanguoxia_Formation_Lanzhou-Minhe_Basin_Northwest_China [accessed Nov 13 2021], by Dingding Du et al., 2018.
Lithology Pattern:
Sandstone
Relationships and Distribution
Lower contact
Conformable contact with Zhujiatai Fm
Upper contact
Next younger unit is the Hongkucheng Fm of lower Albian
Regional extent
GeoJSON
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Fossils
Plentiful dinosaur footprints
Age
Shown as mid-Hauterivian through Aptian by Dangpeng Xi, Xiaoqiao Wan, et al. (2019; Integrated Stratigraphy and TimeScale of China).
Age Span:
Beginning stage:
Hauterivian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
129.55
Ending stage:
Aptian
Fraction up in the ending stage:
1.0
Ending date (Ma):
113.20
Depositional setting
"Records the process of tectonic uplift of the Qilian Mountains during the Early Cretaceous." Fluvial and lake facies.
Depositional pattern:
Additional Information
Compiler: