Shuanglanggou Fm
Period:
Devonian
Age Interval:
D32 (41b), Famennian (latest Devonian)
Province:
Gansu
Type Locality and Naming
The type section is located at Dong Hill of Shilixiang Village, 12.5 km of Xihe County, Gansu Province. It was named by Du Yuanseng and others in 1988.
Lithology and Thickness
Slate. The Formation is characterized by dark-gray and yellowish-brown thin-bedded clayey slate intercalated with silty slate and calcareous slate, with horizontal and graded bedding structures. It has an incomplete thickness of 273 m.
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
It rests conformably on the Honglingshan Fm.
Upper contact
Overlain (faulted contact?) by Carboniferous
Regional extent
GeoJSON
null
Fossils
Conodont Palmatolepis cf. triangularis and ostracod Entomozoe (Richteria) sp. occur in its lower and upper parts, respectively.
Age
Famennian (latest Devonian)
Age Span:
Beginning stage:
Famennian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
371.10
Ending stage:
Famennian
Fraction up in the ending stage:
1.0
Ending date (Ma):
359.30
Depositional setting
Depositional pattern:
Additional Information
Compiler:
(Cao Xuanduo)