West Brook
Basic information
Sample name: West Brook
Sample aka: Arbuckle Mountain
Reference: A. P. Jijina, E. D. Currano, and K. Constenius. 2019. The paleobotany and paleoecology of the Eocene Herren Beds of north-central Oregon, USA. Palaios 34:424-436 [ER 4417]
Geography
Country: United States
State: Oregon
County: Morrow
Coordinate: 45.12° N, -119.05° W
Latlng basis: estimated from map
Time interval: Middle Eocene
Max Ma: 44.5
Min Ma: 43.8
Age basis: other
Geography comments: "~28 km southeast of the town of Heppner" and "~75 m to the NW of the East Brook site" (rough coordinate based on map in Fig. 1)
from the upper Herren Beds, which are "bracketed by the ca. 44.5 Ma age at the base and the age of the overlying Clarno Formation that provisionally has an age of about 43.8 Ma": the first age is U/Pb on zircon and the second is based on "argon-dating", indicating a Middle Eocene age
from the upper Herren Beds, which are "bracketed by the ca. 44.5 Ma age at the base and the age of the overlying Clarno Formation that provisionally has an age of about 43.8 Ma": the first age is U/Pb on zircon and the second is based on "argon-dating", indicating a Middle Eocene age
Environment
Lithology: siliciclastic (mixed)
Taphonomic context: overbank deposit
Habitat comments: from "~3m of medium grained sandstone... to siltstone strata, suggesting varying energy level floodplain events... Fossil plants... are abundant throughout the section and as float"
Methods
Life forms: leaves
Sample size: 56 specimens
Years: 2014, 2015
Museum: University of Wyoming Geological Museum
Net or trap nights: 0
Basal area status: not applicable
Metadata
Sample no: 4703
Contributor no: John Alroy
Enterer: John Alroy
Created: 2025-11-23 01:15:04
Modified: 2025-11-23 01:15:04
Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
12 species
3 singletons
total count 56
geometric series index: 21.8
Fisher's α: 4.685
geometric series k: 0.7729
Hurlbert's PIE: 0.8377
Shannon's H: 2.1107
Good's u: 0.9477
Register
| Comptonia sp. HER37 | 2 | |
| Alnus sp. HER38 | 3 | |
| Rhamnites sp. HER39 | 4 | |
| Acer sp. HER40 | 1 | |
| Quercus banksifolia | 6 | |
| Angiospermae indet. HER42 | 1 | |
| Angiospermae indet. HER43 | 1 | |
| Angiospermae indet. HER44 | 2 | |
| Arecaceae indet. HER45 | 3 | |
| Glyptostrobus sp. HER12 | 7 | |
| Thuja sp. HER30 | 17 | |
| Allantodiopsis sp. HER14 | 9 | |