Bloque Hundido
Basic information
Sample name: Bloque Hundido
Sample aka: Arroyo Santa Flavia; H18
Reference: B. Vento and M. B. Prámparo. 2018. Angiosperm association from the Río Turbio Formation (Eocene?Oligocene) Santa Cruz, Argentina: revision of Hünicken's (1955) fossil leaves collection. Alcheringa 42(1):125-153 [ER 4423]
Geography
Country: Argentina
State: Santa Cruz
Coordinate: 51° 0' S, 72° 0' W
Latlng basis: based on nearby landmark
Formation: Río Turbio
Time interval: Middle Eocene
Max Ma: 47.0
Min Ma: 46.0
Age basis: other
Geography comments: several specimens from "H18" are from another H18 site called Diquecito, and are excluded here
coordinate based on Río Turbio
from horizon in the middle of the lower member based on Fig. 2, and the member is dated at 47 to 46 Ma based on "detrial zircon U/Pb geochronology"
coordinate based on Río Turbio
from horizon in the middle of the lower member based on Fig. 2, and the member is dated at 47 to 46 Ma based on "detrial zircon U/Pb geochronology"
Environment
Lithology: shale
Habitat comments: horizon t is shown as a shale in FIg. 2
the formation consists of "littoral marine or coastal deposits"
the formation consists of "littoral marine or coastal deposits"
Methods
Life forms: leaves
Sample size: 42 specimens
Museum: Museo de Paleontología, Córdoba Province
Net or trap nights: 0
Basal area status: not applicable
Sampling comments: the collection was originally described by Hünicken (1955, 1967)
Metadata
Sample no: 4710
Contributor no: John Alroy
Enterer: John Alroy
Modifier no: John Alroy
Created: 2025-11-23 04:21:02
Modified: 2025-11-23 08:05:43
Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
21 species
11 singletons
total count 42
geometric series index: 66.1
Fisher's α: 16.714
geometric series k: 0.933
Hurlbert's PIE: 0.9361
Shannon's H: 2.8913
Good's u: 0.7393
Register
| Drimys sp. | 1 | |
| Tetracera cf. patagonica | 1 | |
| Pouterlabatia cf. lanceolata | 1 | |
| Cinnamomum neogaea | 1 | |
| Nectandra prolifica | 1 | |
| up to 6 specimens | ||
| Persea sp. | 1 | |
| Annona sp. | 1 | |
| Casearia cf. spinulososerrata | 2 | |
| Eucalyptus sp. | 3 | |
| Myrcia cf. reticulovenosa | 1 | |
| Psidium araciformis | 1 | |
| Qualea patagonica | 3 | |
| Ziziphus chubutensis | 3 | |
| Anacardites pichileufensis | 4 | |
| Schinopsis patagonica | 1 | |
| Allophylus graciliformis | 3 | |
| Cupania grosseserrata | 3 | |
| Cupania latifolioides | 4 | |
| Cupania patagonica | 3 | |
| Cupania santacrucensis | 3 | |
| Cissus pichileufensis | 1 | |
| referred specimens are apparently all from Diquecito | ||