Aihui Fm
Period:
Ordovician
Age Interval:
Late Ordovician, (7)
Province:
Heilongjiang
Type Locality and Naming
Type section at Aihui County in Heihe City, Heilongjiang Province. Named by Cui Ge, 1983, Collection of Plate Tectonic of Northern China, (1), Beijing: Geological Publishing House. First appeared in a 1977 manuscript by No.2 Element, No.1 Heilongjiang Regional Geological Survey Team.
Synonym:
Lithology and Thickness
Alternating beds of black shales and siltstones
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Regionally, the next older unit is the Luohe Fm.
Upper contact
Regionally, the next younger unit is the Huanghuagou Fm of late Hirnantian and early Silurian.
Regional extent
GeoJSON
null
Fossils
Age
Age Span:
Beginning stage:
Katian
Fraction up in beginning stage:
0.7
Beginning date (Ma):
447.47
Ending stage:
Hirnantian
Fraction up in the ending stage:
0.5
Ending date (Ma):
444.14
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Extracted from Geological Formation Names of China (1866-2000); Springer Publ.