Where: Río Negro, Argentina (38.8° S, 67.9° W: paleocoordinates 41.1° S, 55.8° W)

• coordinate stated in text

• local area-level geographic resolution

When: Middle Member (Allen Formation), Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Middle section of Allen Formation

Environment/lithology: terrestrial; mudstone

Size class: microfossils

Preservation: permineralized

Collected by Pincheira and Garrido in 2023

Collection methods: bulk, chemical, acetic, hydrochloric,

• The material was scattered, and one drop of hydrochloric acid was added to test for the presence of carbonates. HCl (30%) and HF (45%) were applied successively, and washings were carried out using distilled water until the sample was neutralized after each acid. In some cases, it was necessary to repeat the procedure with HF. Then, they were treated with hot HCl to disaggregate the organic matter and filtered through 25 μm and 10 μm meshes. Gelatin-glycerin and a drop of formalin were used as mounting medium. The palynological study was carried out using a Leica DM 500 optical microscope and an AmScope 14 MPixels video camera. The optical instruments belong to the Palynology and Paleobotany Laboratory of the CICYTTP (CONICET-ENTRE RIOS-UADER) located in Diamante, Entre Ríos. The studied material has been deposited at the Paleopalynology collection of the Palynology and Paleobotany Laboratory at the CICYTTP Research Center (CONICET- ENTRE RIOS-UADER) and was identified under the initials CICYTTP-Pl 1373 to CICYTTP-Pl 1396

Primary reference: E. P. Pincheira and A. C. Garrido. 2024. Palynostratigraphy from the Allen and Jagüel formations at the Cerro Gutiérrez locality, Lago Pellegrini area, South Argentina. Journal of South American Earth Sciences 148(78):105139more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 238224: authorized by Evangelos Vlachos, entered by Franco Aspromonte on 15.01.2025

Creative Commons license: CC BY (attribution)