Dayu Fm
Period:
Paleogene
Age Interval:
Late Eocene (17a,b,c)
Province:
Henan
Type Locality and Naming
The naming section is located at Sanjiaogou, Lushi County, Henan. Named by the Fourth Geological Party, Henan Bureau of Geology in 1979.
Synonym: Dayuzu Fm
Lithology and Thickness
Lower part is brownish red mudstone and conglomerate with thin-bedded marlstone. Middle part is grayish white, grayish yellow and grayish red marlstone with grayish green shale. Upper part is loose, brownish red conglomerate, with a clay bed. The total thickness is ~800 m.
Lithology Pattern:
Continental marl
Relationships and Distribution
Lower contact
This formation is conformably underlain by the Middle Eocene Chugouyu Fm.
Upper contact
This formation is overlain mostly by the Neogene. Regionally, the next younger unit is the Baode Fm (or the Dongshapo Fm in nearby Henan?)
Regional extent
GeoJSON
null
Fossils
No fossils have been found
Age
Its age is tentatively assigned to Late Eocene according to the sequence of strata because no fossils have been found
Age Span:
Beginning stage:
Bartonian
Fraction up in beginning stage:
0.9
Beginning date (Ma):
38.04
Ending stage:
Chattian
Fraction up in the ending stage:
1.0
Ending date (Ma):
23.04
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Tao Deng, Yuanqing Wang, Qian Li, et al.