Yidade Fm
Period:
Devonian
Age Interval:
D22-D31 (57), Givetian-Frasnian (late Middle to early Late Devonian)
Province:
Yunnan
Type Locality and Naming
The type section is located near Yutade Village of Panxi County, Yunnan Province.
It was named by Sun Yunzhu in 1945.
Lithology and Thickness
Limestone, shale. The formation, 345 m thick, is composed of dark-gray to grayish-black thin- to medium-bedded clayey limestone intercalated with few shale beds, and with a set of 20 m thick brown shales at the base.
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
Upper contact
Regional extent
GeoJSON
null
Fossils
It contains abundant leiorhynchid brachiopoda.
Age
It is diachronous in age from Upper Givetian to Frasnian (late Middle to early Late Devonian)
Age Span:
Beginning stage:
Givetian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
385.30
Ending stage:
Frasnian
Fraction up in the ending stage:
1.0
Ending date (Ma):
371.10
Depositional setting
Depositional pattern:
Additional Information
Compiler:
(Xian Shiyuan)