| Haifanggou Formation | |
|---|---|
| Stratigraphic range: Callovian-Oxfordian ~ | |
| Type | Geological formation |
| Underlies | Tiaojishan Formation |
| Overlies | Beipiao Formation (Separated by an unconformity) |
| Lithology | |
| Primary | Conglomerate |
| Other | Sandstone, mudstone, shale, coal |
| Location | |
| Coordinates | 41°48′N 120°48′E / 41.8°N 120.8°E |
| Approximate paleocoordinates | 44°30′N 126°00′E / 44.5°N 126.0°E |
| Region | Inner Mongolia |
| Country |  China |
| Type section | |
| Named for | Haifanggou |
| Named by | Liaoning Stratigraphic Group |
| Year defined | 1978 |
  Haifanggou Formation (China)  Haifanggou Formation (Inner Mongolia) | |
The Haifanggou Formation (simplified Chinese: 海房沟组; traditional Chinese: 海房溝組; pinyin: Hǎifánggōu zǔ), also known as the Jiulongshan Formation (simplified Chinese: 九龙山组; traditional Chinese: 九龍山組; pinyin: Jiǔlóngshān zǔ), is a fossil-bearing rock deposit located near Daohugou (simplified Chinese: 道虎沟; traditional Chinese: 道虎溝) village of Ningcheng County, in Inner Mongolia, northeastern China.
The formation consists of coarse conglomerates, sandstone, mudstone, and thin coal layers deposited in deltaic and lacustrine environments.
The formation dates to the Callovian of the Middle Jurassic to the Oxfordian of the Late Jurassic.[1]
The most prominent locality of the Haifanggou Formation are the Daohugou Beds, located near the village of Daohugou in southeastern Inner Mongolia.[2] Other localities include Wuhuaxigou, Chentaizi, Jiangzhangzi, Wubaiding, Guancaishan, Haifenggou, Fanzhangzi, and Zhuanshanzi.[3]
- ^ Liu, Yongqing; Liu, Yanxue; Ji, S.; Yang, Z. (2006). "U-Pb zircon age for the Daohugou Biota at Ningcheng of Inner Mongolia and comments on related issues". Chinese Science Bulletin. 51 (21): 2634–2644. Bibcode:2006ChSBu..51.2634L. doi:10.1007/s11434-006-2165-2. S2CID 96442710.
- ^ Huang, D.; Cai, C.; Jiang, J.; Su, Y.; Liao, H. (2015). 道虎沟化石层及其底部砾岩段化石记录 [Dahugou bed and fossil record of its basal conglomerate section]. Acta Palaeontologica Sinica (in Chinese (China)). 54 (3): 75–81. ISSN 0001-6616.
- ^ Xu, Xing; Zhou, Zhonghe; Sullivan, Corwin; Wang, Yuan; Ren, Dong (2016). "An Updated Review of the Middle-Late Jurassic Yanliao Biota: Chronology, Taphonomy, Paleontology and Paleoecology". Acta Geologica Sinica - English Edition. 90 (6): 2229–2243. Bibcode:2016AcGlS..90.2229X. doi:10.1111/1755-6724.13033. ISSN 1755-6724. S2CID 133314433.