Wallenried Channel layer (Miocene of Switzerland)

Where: Fribourg, Switzerland (46.9° N, 7.1° E: paleocoordinates 45.9° N, 6.4° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: MN 2a mammal zone, Lower Freshwater Molasse Formation, Agenian (23.0 - 20.0 Ma)

• "The outcropping sediments form part of the ‘‘Molasse grise de Lausanne’’ Formation [Lower Freshwater Molasse (USM)] within the ‘‘Plateau Molasse’’ (Becker et al. 2001; Becker 2003) and are attributed to the Agenian [MN 2a] European land mammal age." - Mennecart et al (2016)

Environment/lithology: coarse channel fill; fine-grained, medium, coarse sandstone

• The sedimentary architecture of the Wallenried quarry corresponds to a perennial meandering river system, with channel deposits and sandy bedforms dominated by medium to coarse sands and in decreasing granulometry from crevasse channel to floodplain deposits and/or oxbow lakes, with a predominance of fine-grained sediments. The mottled clayey to silty floodplain deposits relate to ephemeral ponds associated with seasonality in water supply.
• Although not explicitly stated, presumably structured as described in the general "Channel" section of Becker et al (2001). Fine to coarse sand, sometimes with mud balls.

Size classes: macrofossils, mesofossils

Collection methods: bulk, sieve

Primary reference: D. Becker, G. E. Rössner, L. Picot and J.-P. Berger. 2001. Early Miocene ruminants of Wallenried (USM, Aquitanian/Switzerland): sedimentology, biostratigraphy and paleoecology. Eclogae Geologicae Helvetiae 94:547-564 [T. Cleary/T. Cleary]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 203093: authorized by Terri Cleary, entered by Terri Cleary on 25.07.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Vertebrata indet. Lamarck 1801
Reptilia
 Squamata - Anguidae
Ophisaurus sp. Daudin 1803 glass lizard
 Crocodylia -
Crocodylia indet. Owen 1842 crocodilian
spelled "Crocodilia" in ref
 Testudinata -
Testudinata indet. Oppel 1811 turtle
there is another turtle identified here, "Ergilemys vel. [or] Geochelone", but since it could be either I haven't added it to the list here
Mammalia
 Placentalia -
Rodentia indet. Bowdich 1821 rodent
 Rodentia - Cricetidae
Cricetidae indet. Fischer von Waldheim 1817 mouse
Eucricetodon aff. gerandianus Gervais 1848 mouse
 Rodentia - Eomyidae
Eomyidae indet. Winge 1887 rodent
 Placentalia -
Lagomorpha indet. Brandt 1885 placental
 Lagomorpha - Ochotonidae
 Artiodactyla - Moschidae
 Artiodactyla - Andegamerycidae
 Artiodactyla -
"Cetartiodactyla indet." = Artiodactyla
"Cetartiodactyla indet." = Artiodactyla Owen 1848 even-toed ungulate
Gastropoda
 Stylommatophora - Limacidae
Limacidae indet. Lamarck 1801 slug
 Stylommatophora - Helicidae
Helicidae indet. Rafinesque 1815 slug