Patti Fm
Period:
Cretaceous
Age Interval:
Santonian-Campanian (outcrop at Vridhachalam area)
Province:
E.India Cauvery Basin
Type Locality and Naming
VRIDHACHALAM OUTCROP: Named after Patti village, Vridhachalam area, TamilNadu.
Synonym: Patti Limestone
[Figure 1: Geologic map of Vridhachalam area]
Lithology and Thickness
Limestone. Pale, coarse-grained, impure, bioturbated grainstone (calcarenite) with interlayers of marl and thin shale and siltstone seams and lenses of limestone (Sundaram et al., 2001).
Lithology Pattern:
Limestone
Relationships and Distribution
Lower contact
Conformable with Parur Fm below
Upper contact
Conformable with Mattur Fm above
Regional extent
not available.
GeoJSON
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Fossils
Planktonic foraminifera
Age
Santonian- Campanian (Rasheed and Govindan, 1966). [Note that Patur Fm below was assigned as "Campanian", therefore Patti Fm is indicated as late Campanian for lithostrat column here.]
Age Span:
Beginning stage:
Santonian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
85.70
Ending stage:
Campanian
Fraction up in the ending stage:
1.0
Ending date (Ma):
72.17
Depositional setting
Shallow shelf, transgressive facies assemblage, dominated by well-worked bioclastic sediment of sand grade (Sundaram et al., 2001)
Depositional pattern:
Additional Information
Compiler:
A. Nallapa Reddy & R. Nagendra