La Pola, Argentine Bryozoans (Ordovician of Argentina)

Where: San Juan, Argentina (30.3° S, 68.5° W: paleocoordinates 34.7° S, 133.7° W)

• coordinate stated in text

When: Amorphognathus tvaerensis brachiopod zone, La Pola Formation, Sandbian (458.4 - 453.0 Ma)

• included in Las Plantas sequence; Baltoniodus variabilis Subzone

Environment/lithology: shallow subtidal; sandstone

• conclusions: combination of these growth forms indicates shallow shelf conditions
• fig. 3: Microfacies of the main bryozoan-bearing rocks (lenticular quartz-bioclastic-rich sandstones

•figure 2: silty green shales/fine grained sandstone, bioclastic conglomerates and breccias, pebbly mudstones, bioturbated and nodular mudstones

•

•succession of thick-bedded coarse-grained debris flows (ranging from mud to clast supported) with interbedded pebbly mudstones, amalgamated lenticular quartz-bioclastic- rich sandstones, as well as a few turbidites and silty shales

Size classes: macrofossils, mesofossils

Primary reference: A. Ernst and M. Carrera. 2022. A cool-water bryozoan association from the La Pola Formation (Sandbian, Ordovician) of Argentine Precordillera. Geodiversitas 44(20):563-601 [B. Seuss/B. Seuss]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 226179: authorized by Barbara Seuss, entered by Barbara Seuss on 21.06.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Brachiopoda indet., Algae indet., Albardonia bifoliata n. gen. n. sp., Argentinopora robusta n. gen. n. sp.
Algae indet.
calcareous
Albardonia bifoliata n. gen. n. sp.
Argentinopora robusta n. gen. n. sp.
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
Stenolaemata
 Trepostomata - Heterotrypidae
Heterotrypa enodis n. sp.
 Trepostomata - Halloporidae
Tarphophragma macrostoma, Dianulites rocklandensis, Diplotrypa "sp. A"
Diplotrypa "sp. A" Nicholson 1879
 Trepostomida -
Jordanopora heroensis
 Trepostomida - Monticuliporidae
Homotrypa vacua, Homotrypa subramosa, Monticulipora aff. mammulata, Orbignyella multitabulata
Homotrypa subramosa Ulrich 1886
 Trepostomida -
Nicholsonella spinigera n. sp.
 Fenestrata - Chasmatoporidae
Parachasmatopora "sp. A"
Parachasmatopora "sp. A" Morozova and Lavrentjeva 1981
 Cystoporata - Constellariidae
Xenotrypa argentinensis n. sp., Lunaferamita virginiensis
 Cryptostomata - Arthrostylidae
Arthroclema "sp. A"
Arthroclema "sp. A" Billings 1862
 Cryptostomata -
Chazydictya ornata n. sp.
 Cryptostomata - Rhinidictyidae
Trigonodictya elegans
 Cryptostomata - Stictoporellidae
Pseudostictoporella simplex n. sp.