Chrummorge
Basic information
Sample name: Chrummorge

Reference: T. Bolliger. 2013. Late Oligocene micromammal teeth (MP28/29) from the Lower Freshwater Molasse (USM) of Chrummorge (Lägern, N-Switzerland). Swiss Journal of Geosciences 106:147-159 [ER 3917]
Geography
Country: Switzerland

State: Aargau

County: Baden

Coordinate: 47.47567° N, 8.34934° E
Latlng 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 Lägern 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

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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

Methods
Life forms: rodents, ungulates, other small mammals

Sampling methods: screenwash

Sample size: 82 specimens

Net or trap nights: 0

kg screened: 300

Basal area status: not applicable

Sampling comments: Roughly 300 kg of sediment was screenwashed

14 mammal taxa were identified but 9 distinguished to species level

Metadata
Sample no: 4318

Contributor no: Jack Nesbitt

Enterer: Jack Nesbitt

Created: 2023-06-28 15:39:45

Modified: 2023-09-11 10:55:46

Abundance distribution
Each square represents a species. Square sizes are proportional to counts. Values are logged.
Statistics
14 species
3 singletons
total count 82
geometric series index: 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
Register
Cainotheriidae indet.11
†Amphiperatherium exile 1
Paratalpa cf. micheli 2
†Heteroxerus cf. lavocati 2
Gliravus sp. 2
Rhizospalax poirrieri 2
†Eomys cf. major 1
†Eomys cf. ebnatensis 31
†Plesiosminthus cf. promyarion 2
†Adelomyarion vireti 11
†Eucricetodon aff. dubius 12
Melissiodon sp. 1
Issiodoromys sp. 2
Archaeomys sp. 2