Biohorizon in the Tetragraptus akzharensis Biozone of the Muñayoc section (Ordovician of Argentina)

Also known as Muñayoc section

Where: Jujuy, Argentina (22.7° S, 66.1° W: paleocoordinates 44.5° S, 128.2° W)

• coordinate estimated from map

• hand sample-level geographic resolution

When: Tetragraptus akzharensis graptolite zone, Early/Lower Ordovician (485.4 - 470.0 Ma)

Environment/lithology: deep subtidal; volcaniclastic mudstone and volcaniclastic sandstone

• A 150-m-thick volcano-sedimentary succession that evidences an upward progression from mudstone-dominated dysaerobic outershelf deposits to sandstone-dominated deposition under storm and wave influence, with an upper sandier partrelated to a general regressive trend.

Size class: microfossils

Collection methods: quarrying,

• The studied material is housed in the paleontological collection of the Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), CONICET and Universidad Nacional de Córdoba, Argentina, under the prefix CEGH-UNC.

Primary reference: G. A. Lo Valvo, N. C. Herrera Sánchez, and B. A. Toro. 2020. Early-Middle Ordovician graptolites from the Argentine Puna: quantitative paleobiogeographic analysis based on a systematic revision. Ameghiniana 57(6):534-554 [E. Vlachos/N. Herrera Sánchez/N. Herrera Sánchez]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 220275: authorized by Evangelos Vlachos, entered by Nexxys Herrera Sánchez on 13.05.2021

Creative Commons license: CC BY (attribution)

Taxonomic list

"Expansograptus similis" = Graptolithus similis, "Expansograptus constrictus" = Graptolithus constrictus
"Expansograptus similis" = Graptolithus similis Hall 1865 graptolite
"Expansograptus constrictus" = Graptolithus constrictus Hall 1865 graptolite
 Graptoloidea - Didymograptidae
Baltograptus vacillans Tullberg 1880 graptolite
Baltograptus geometricus Törnquist 1901 graptolite
 Graptoloidea - Dichograptidae
Clonograptus flexilis, "Cymatograptus protobalticus" = Didymograptus protobalticus
Clonograptus flexilis Hall 1858 graptolite
"Cymatograptus protobalticus" = Didymograptus protobalticus Monsen 1937 graptolite
 Graptoloidea - Phyllograptidae
Corymbograptus vfractus Salter 1863 graptolite
Corymbograptus vfractus tullbergi