The Apillapampa section (Bolivia): field trip accomplished in July 2023-a report of “Gondwana to Euramerica Correlations Working Group"

DI PASCUO, MERCEDES; CISTERNA, GABRIELA A.; CALLE SALCEDO, ABNER ANDRÉS; LÓPEZ, SHIRLEY; GRADER, GEORGE; DI NARDO, JUAN; KAVALI, P.; IANNUZZI, ROBERTO; STERREN, ANDREA F.; ARCHBOLD, N.W., CISTERNA, G.A. & SIMANAUSKAS, T.; TICONA, YULISA; SILVESTRI, LEONARDO

Permophiles

International Commission on Stratigraphy

Año: 2024 vol. 76 p. 29 - 33

1684-5927

The Permian marine to transitional deposits at Apillapampain Bolivia matches Permian Stratigraphy Working Group (WG)goals because of co-occurrence of several species of conodontsand fusulinids with abundant other taxa including plants andpalynology, as well as volcanic tuffs (some U-Pb dated).‘Bridge taxa’ occur throughout different Gondwanan provincesand support correlations with northern hemisphere Cisuralian‘standard sections’ (including GSSPs) in Russia, USA, and China(Cisterna et al. 2022, in Permophiles 72). As part of an on-goingproject on Carboniferous – Permian fossiliferous successions ofBolivia (Grader et al., 2008; di Pasquo et al., 2009, 2013, 2014,2015, 2019, 2022), a field trip to the Apillapampa section wascarried out in July 2023.New data over the last 20 years suggest Asselian andSakmarian sequences at Apillapampa extend about 100+ m higherinto the Sakmarian (vs. previously determined Artinskian ages).This changed regional interpretations of upper Cisuralian stratain Bolivia with many attendant paleontological questions. Tofurther test these data, four of the authors (Mercedes di Pasquo,Gabriela A. Cisterna, Abner Salcedo and Shirley López), wentto Apillapampa (Fig. 1) to collect invertebrates and samples formicrofossils and palynology. We searched for key Gondwanantaxa among different fossil groups useful for taxonomic revisionand regional stratigraphic distribution. We aim to share thesedata by digital means, including galleries of photographs andtaxonomic notes (another aim of the WG), as addressed further below.