Hell Creek Formation
597 distinct taxa, from 5,516 fossil occurrences the Paleobiology Database records under this name, spanning 72–63 Mya.
North Dakota, Montana, South Dakota, Wyoming · US
597 taxa · 5,516 fossils · 72–63 MyaFiled under the Montana Group. Members recorded: Upper, Lower, Pretty Butte, Little Beaver Creek, Breien, Middle Sandstone.
Macrostrat places this rock in the Montana Group. Macrostrat’s own record
Loading coastlines…
131 distinct localities, where the rock is now rather than where it was laid down. Tectonics draws the world it belonged to.
When
What has been found
- Dicotyledoneae
- Ceratopsidae
- Trionychidae
- Aquilapollenites
- Dryophyllum subfalcatum
- Champsosaurus
- Baenidae
- Brachychampsa montana
- Meniscoessus robustus
- Adocus
- Compsemys victa
- Borealosuchus sternbergii
- Lepisosteus occidentalis
- Platanaceae
- Triceratops
- Scapherpeton tectum
- Myledaphus bipartitus
- Theropoda
- Tyrannosaurus rex
- Didelphodon vorax
- Laurales
- Azolla
- Crocodylia
- Cyclurus fragosus
- Chelydridae
- Helopanoplia beecheri
- Magnoliid
- Hadrosaurinae
- Paronychodon
- Marmarthia trivialis
- Melvius thomasi
- Vitis
- Mesodma
- Trochodendroides
- Hadrosauridae
- Stygimys kuszmauli
- Leepierceia preartocarpoides
- Lonchidion selachos
- Platanites marginata
- Baioconodon nordicus
The 40 most often recorded, of 597.
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.