Germig Fm
Type Locality and Naming
"The type locality of the Germig Formation lies 2.5 km south of the small village of Germig and 1.5 km south-southeast of the settlement Nian Duo Cun, near milestone 5260 of the Sino-Nepal International Road (28°42.0'N, 86°08.5'E)." North of Nyalam, and west of Tingri.
Synonym:
Lithology and Thickness
"Chiefly of siltstones and fine-grained sandstones characterized frequently by ripple-bedding.
Relationships and Distribution
Lower contact
Next older unit is the Norian-Rhaetian Derirong Fm.
Upper contact
Regionally, the next younger unit is the Jurassic Pupuga Fm.
Regional extent
Germig Formation crops out in the Lanongla region of southern Tibet, on the northern flank of the Tibetan Himalaya.
GeoJSON
Fossils
Hautman et al. (2008) cite Hallam et al (Hallam, A., Wignall, P.B., Yin, J., and Riding, J.B., 2000, An investigation into possible facies changes across the Triassic-Jurassic boundary in southern Tibet: Sedimentary Geology, 137: 101–106.) that it spans part of the Marshi ammonoid zone of latest Rhaetian, and the Tibeticum Zone and part of the Caliphylium ammonite zones of early Hettangian; and they record numerous bivalves.
Age
Depositional setting
"As a part of the Tethyan Himalayan tectonic province, the Germig Formation was deposited at the southeastern margin of the Tethys at 25S paleolatitude (Metcalfe, 1996). Deposition was in a shallow, fully marine setting (Hallam et al., 2000)."
Additional Information