Chrummorge
Basic information
Sample name: Chrummorge
Reference: T. Bolliger. 2013. Late Oligocene micromammal teeth (MP28/29) from the Lower Freshwater Molasse (USM) of Chrummorge (Lågern, N-Switzerland). Swiss Journal of Geosciences 106:147-159 [ER 3917]
Geography
Country: Switzerland
State: Aargau
Coordinate: 47.47567° N, 8.34934° E
Coordinate basis: stated in text
Formation: Molasse Basin
Time interval: Late Oligocene
Zone: MP28/29
Ma: 24.6
Age basis: zone
Geography comments: The Chrummorge locality is situated on the Lågern hill 20 km NW of Zurich, Switzerland
Chrummorge has been dated to 24.6 +/- 0.2 Ma based on faunal comparisons with the Fornant 6 and Rickenbach localities
Chrummorge has been dated to 24.6 +/- 0.2 Ma based on faunal comparisons with the Fornant 6 and Rickenbach localities
Environment
Lithology: sandstone
Taphonomic context: fluvial deposit
Habitat comments: The Oligocene molasse sediments are composed of "fine to middle-grained quartz- and mica-rich unconsolidated sands and sandstones crop out"
Sorting resulting from river transport seems evident
Sorting resulting from river transport seems evident
Methods
Life forms: rodents,ungulates,other small mammals
Sampling methods: screenwash
Sample size: 82 specimens
Sampling comments: Roughly 300 kg of sediment was screenwashed
14 mammal taxa were identified but 9 distinguished to species level
14 mammal taxa were identified but 9 distinguished to species level
Metadata
Sample number: 4318
Contributor: Jack Nesbitt
Enterer: Jack Nesbitt
Created: 2023-06-28 15:39:45
Modified: 2023-09-11 10:55:46
Abundance distribution
14 species
3 singletons
total count 82
extrapolated richness: 27.2
Fisher's α: 4.853
geometric series k: 0.7679
Hurlbert's PIE: 0.7925
Shannon's H: 1.9832
Good's u: 0.9654
Each square represents a species. Square sizes are proportional to counts.
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Register
Current reference:
Huckleberry et al. 2001 (ER 3215)