Las Lajas, Argentina (Ordovician of Argentina)

Also known as Reefs 1241, 1242, 1243

Where: Argentina (32.1° S, 68.6° W: paleocoordinates 35.4° S, 131.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: San Juan Formation, Arenigian (478.6 - 468.1 Ma)

• Age based on conodonts and brachiopods

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified framestone

• Samll mounds and biostromes composed of laminar reef builders and a sponge/algal association.

Size classes: macrofossils, mesofossils, microfossils

Collection methods: peel or thin section,

Primary reference: M. Keller and E. Flügel. 1996. Early Ordovician reefs from Argentina: stromatoporid vs stromatolite origin. Facies 34:177-192 [W. Kiessling/W. Kiessling/W. Kiessling]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 24313: authorized by Wolfgang Kiessling, entered by Wolfgang Kiessling on 05.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
Brachiopoda
  -
Brachiopoda indet.
Brachiopoda indet. Cuvier 1805
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Cephalopoda
 Nautilida -
Nautilida indet.
Nautilida indet. Agassiz 1847 nautiloid
Gastropoda
 Euomphalina - Macluritidae
Maclurites sp.
Maclurites sp. Le Sueur 1818 snail
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
unclassified
  -
Porifera indet.
Porifera indet. Grant 1836
 Pulchrilaminida - Pulchrilaminidae
Zondarella communis n. gen. n. sp.
Zondarella communis n. gen. n. sp. Keller and Flügel 1996
stromatoporoid
Hormogoneae
 Oscillatoriales - Girvanellaceae
Girvanella sp.
Girvanella sp. Nicholson and Etheridge 1878
End reef builders