Jehol Biota

Part of a series on
Paleontology
Fossils Fossilization Trace fossil Microfossil Fossil preparation Index fossil List of fossils List of fossil sites Lagerstätte fossil beds List of transitional fossils List of human evolution fossils
Natural history Biogeography Extinction event Geochronology Geologic time scale Geologic record History of life Origin of life Paleoclimatology Timeline of evolution Transitional fossil
Organs and processes Avian flight Cells Multicells Eyes Flagella Hair Mammalian auditory ossicles Mosaic evolution Nervous systems Sex
Evolution of various taxa Birds Butterflies Cephalopods Cetaceans Dinosaurs Fishes Fungi Humans Insects Mammals Molluscs Plants Reptiles Sea cows Spiders Tetrapods
Evolution Introduction to evolution Common descent Phylogeny Cladistics Biological classification
History of paleontology History of paleontology Timeline of paleontology
Branches of paleontology Biostratigraphy Ichnology Invertebrate paleontology Micropaleontology Molecular paleontology Palaeoxylology Paleobiology Paleobotany Paleoecology Paleogenetics Paleolimnology Paleomycology Paleoneurobiology Paleopathology Paleopedology Paleotempestology Paleozoology Palynology Sclerochronology Taphonomy Vertebrate paleontology
Paleontology Portal Category
v t e

The Jehol Biota includes all the living organisms – the ecosystem – of northeastern China between 133 and 120 million years ago. This is the Lower Cretaceous ecosystem which left fossils in the Yixian Formation and Jiufotang Formation. These deposits are composed of layers of tephra and sediment.^[1] It is also believed to have left fossils in the Sinuiju series of North Korea.^[2] The ecosystem in the Lower Cretaceous was dominated by wetlands and numerous lakes (not rivers, deltas, or marine habitats). Rainfall was seasonal, alternating between semiarid and mesic conditions. The climate was temperate. The Jehol ecosystem was interrupted periodically by ash eruptions from volcanoes to the west. The word "Jehol" is a historical transcription of the former Rehe Province.