Lipeon Formation, Arroyo de los Tomates section (Silurian to of Argentina)

Where: Argentina (24.0° S, 65.0° W: paleocoordinates 49.3° S, 128.8° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Lipeon Formation, Wenlock to Wenlock (433.4 - 423.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; bioturbated, ferruginous, micaceous, gray siltstone and sandstone

• "offshore, quiet water, below wave base. Dark color and pyritic concretions suggest periodic restrictions in oxygen. Zoophycos may reflect muddy bottom rich in organics and partly anoxic. Sandstone beds toward the top indicate shallower, nearshore encironment affected by wave base." BA 3 (Boucot et al. 1999-PBDB ref. 7007).
• Lipeon Formation ranges in thickness from 600 to 800 m. It consists of a monotonous sequence of fine-grained sandstones and siltstones. The lower half of the unit is composed of yellowish, fine-grained, micaceous sandstones...Near the base are several hematitic beds...Ferruginous concretions throughout the formation...extensive bioturbation...trace fossils common. The upper half [relevant here] consists of about 350 m of bioturbated, dark gray, micaceous siltstones. The lower part of this member is richly fossiliferous. Toward the top of the formation there is a progressive increase in the percentage of sands, and discrete sandstone beds are interbedded with the siltstones. These beds show occasional flaser bedding and small-scale ripple cross lamination."

Collection methods: Table 5 (included separately because not all elements contained in collections 25060 and 25061).

Primary reference: T. M. Sanchez, B. Waisfeld, and J. L. Benedetto. 1991. Lithofacies, taphonomy, and brachiopod assemblages in the Silurian of western Argentina: A review of Malvinokaffric Realm communities. Journal of South American Earth Sciences 4(4):307-329 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 25062: authorized by Michael Foote, entered by Michael Foote on 27.08.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Trilobita
 Odontopleurida - Odontopleuridae
Anacaenaspis sp. Bruton 1967 trilobite
 Phacopida - Phacopidae
Ananaspis sp. Campbell 1967 trilobite
 Phacopida - Calmoniidae
 Phacopida - Dalmanitidae
 Phacopida - Homalonotidae
 Phacopida - Calymenidae
Flexicalymene sp. Shirley 1936 trilobite
 Lichida - Lichidae
Lichas cf. affinis Angelin 1854 trilobite
Hyolitha
 Hyolithida -
Hyolithida indet. Mathew 1962
 Lophophorata -
Tentaculitida indet. Ljaschenko 1955
Strophomenata
 Productida - Strophochonetidae
? Protochonetes sp. Muir-Wood 1962
 Strophomenida - Leptestiidae
Leangella sp. Opik 1933
 Strophomenida - Leptostrophiidae
Rhynchonellata
 Rhynchonellida - Trigonirhynchiidae
 Rhynchonellida - Eatoniidae
 Orthida - Heterorthidae
Bivalvia
 Cyrtodontida - Antipleuridae
Dualina sp. Barrande 1881 clam
 Protobranchia - Ctenodontidae
 Nuculoida -
"Nuculoida indet." = Nuculida
"Nuculoida indet." = Nuculida Dall 1889 clam
 Nuculida - Praenuculidae
 Nuculida - Cardiolariidae
 Protobranchia -
Nuculites sp. Conrad 1841 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
 Bellerophontida -
Bellerophontoidea indet. M'Coy 1851 snail
 Murchisoniina - Murchisoniidae
Murchisoniidae indet. Koken 1896 snail
 Murchisoniina - Loxonematidae
Loxonematidae indet. Koken 1889 snail
Cephalopoda
 Orthocerida - Dawsonoceratidae
Dawsonoceras sp. Hyatt 1884
Graptolithina
  -
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
Anthozoa
 Favositida - Micheliniidae
Pleurodictyum sp. Goldfuss 1829 tabulate coral
 Rugosa -
Rugosa indet. horn coral