Nilgiri Limestone Fm
Type Locality and Naming
"The Tethys Himalaya succession begins with very thick, strongly recrystallized and sparsely fossiliferous shallow-water carbonates (Nilgiri Limestone of Bodenhausen et al., 1964; Bordet et al., 1967; Fuchs et al., 1988)
Synonym: Dhaulagiri Limestone'' of Fuchs, 1967, 1977; ``Drongkhang Limestone'' of Bordet et al., 1975),
Lithology and Thickness
Fossiliferous shallow-water carbonates
Relationships and Distribution
Lower contact
Transitional to the underlying marbles of the Larjung Fm.
Upper contact
Overlain by North Face Quartzite Fm
Regional extent
"Highly metamorphosed units seemingly belonging to the same carbonate complex possibly extend down into the Cambrian (Annapurna-Larjung-Mutsog metacarbonates; Bordet et al., 1967, 1975; Fuchs et al., 1988)."
GeoJSON
Fossils
"yielding brachiopods and nautiloids of Ordovician (Llanvirn?) age (Bordet et al., 1971)."
Age
Depositional setting
Additional Information
"A major deformation phase associated with wide-spread granitoid intrusions around the Cambrian/Ordovician boundary. This event is well documented in the N.W. Himalaya (e.g. Garzanti et al., 1986; Grasemann et al., 1997) but less clearly in the central Himalaya, where it may correspond to the major mid- Ordovician turn from platform carbonate (Nilgri Limestone Fm) to siliciclastic sedimentation (North Face Quartzite Fm) but possibly even pre-date deposition of the Nilgiri Limestone."