Where: Río Negro, Argentina (40.8° S, 71.0° W: paleocoordinates 43.3° S, 61.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Huitrera Formation, Ypresian to Ypresian (56.0 - 41.3 Ma)

• Radiometric dating of other fossiliferous localities in the Pilcaniyeu Volcanic Belt yielded Ypresian to Lutetian ages, e.g. 47.46 ± 0.05 My (Wilf et al., 2005, Pichileufu, 40Ar/39Ar values), 54.24 ± 0.45 My (Wilf et al., 2010, Pampa de Jones, 40Ar/39Ar) and 52.3 ± 3 My (Rapela et al., 1983, Rapela et al., 1984, Confluencia, K/Ar) which places these deposits in the lower Eocene. Additionally, 51.91 ± 0.22 My (40Ar/39Ar)was obtained for Laguna del Hunco location (Chubut) placed in the southernmost limits of the Pilcaniyeu Volcanic Belt.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; lithified shale

Size class: macrofossils

Preservation: adpression

Collection methods: Repository: Museo Patagónico de Ciencias Naturales (MPCN)

Primary reference: J. F. Petrulevičius. 2019. A new Frenguelliidae (Insecta: Odonata) from the Eocene of Arroyo Chacay, Patagonia, Argentina. Palaeoentomology 2:591-595 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227116: authorized by Matthew Clapham, entered by Matthew Clapham on 11.09.2022

Creative Commons license: CC BY (attribution)