Xichahe Fm
Type Locality and Naming
The type section is located at Dajiagou of Penjia Village, Xundian County of Shaanxi Province. It was named by Shaanxi Geological Survey in 1980, and was published in 1983 by Paleontological Atlas of Northwest China, Volume San-Gan-Ning.
Lithology and Thickness
Conglomerate, sandstone. Lower part of the Formation is composed of grayish-green and dark-gray siliceous conglomerate intercalated with pebbly feldspar quartz sandstone. Upper part consists of grayish-green and dark-gray thin-bedded feldspar quartz sandstone and sandy slate with lenses of conglomerate and coarse-pebbly sandstone. The Uppermost part has slate with dolomitic limestone. The usual thickness of the Formation is 190 m, but the maximum thickness reaches 590-670 m in the Gongguan-Huilong area.
Relationships and Distribution
Lower contact
Unconformity onto Silurian.
Upper contact
The formation is conformably overlain by the Gongguan Fm dolomite.
Regional extent
Gongguan-Huilong area, Gongguan-Xichahe area.
GeoJSON
Fossils
The uppermost Formation yields bivalve Grammysia sp., Cypricardinia sp., Edmondia sp., and Glassites cf. concentricus.
Age
Depositional setting
Additional Information