Aladi Fm
Period:
Cretaceous
Age Interval:
Maastrichtian (outcrop at Vridhachalam area)
Province:
E.India Cauvery Basin
Type Locality and Naming
VRIDHACHALAM OUTCROP: Named after Aladi village, Vridhachalam area, TamilNadu. Type locality = Only in water wells at Aladi village.
[Figure 1: Geologic map of Vridhachalam area]
Lithology and Thickness
Sandy Claystone. Shale and siltstone with interbeds of cemented sandstone, grainstone (calcarenite) and coquina limestone. This is equivalent to Kallankurichchi Fm (Sundaram et al., 2001).
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Conformable with Mattur Fm.
Upper contact
Disconformable with Cuddalore Fm.
Regional extent
not available.
GeoJSON
{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[78.42,10.98],[78.39,9.75],[78.61,9.7],[79.29,10.96],[78.42,10.98]]]]}}
Fossils
Macrofossils
Age
Maastrichtian
Age Span:
Beginning stage:
Maastrichtian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
72.17
Ending stage:
Maastrichtian
Fraction up in the ending stage:
1.0
Ending date (Ma):
66.04
Depositional setting
Shallow shelf with shell lags related to transgression. (Sundaram et al., 2001).
Depositional pattern:
Additional Information
Compiler:
A. Nallapa Reddy & R. Nagendra