PBDB Collection

Lipeon Formation, interval18, Arroyo de los Tomates section (Silurian to of Argentina)

Also known as Heterorthella Association

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 according to 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: Interval 18, Table 6.

Primary reference: T. M. Sanchez, B. G. 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/O. Alfaro]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 25060: authorized by Michael Foote, entered by Michael Foote on 27.08.2002, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

unclassified
-	Conularida indet. Conularida indet.
Crinoidea
-	Crinoidea indet. Crinoidea indet. Miller 1821 Sea lily
Hyolitha
Hyolithida -	Hyolithida indet. Hyolithida indet. Mathew 1962
Lingulata
Lingulida - Lingulidae	Lingulidae indet. Lingulidae indet. Gray 1840
Strophomenata
Strophomenida - Strophochonetidae	? Protochonetes sp. ? Protochonetes sp. Muir-Wood 1962
Strophomenida - Leptostrophiidae	Castellaroina sp. Castellaroina sp.
Rhynchonellata
Rhynchonellida - Leptocoeliidae	"Harringtonina sp." = Anabaia "Harringtonina sp." = Anabaia
Rhynchonellida - Trigonirhynchiidae	Ancillotoechia cooperensis Ancillotoechia cooperensis
Rhynchonellida - Eatoniidae	Clarkeia ovalis Clarkeia ovalis
Orthida - Heterorthidae	Heterorthella zaplensis Heterorthella zaplensis

Lophophorata -	Tentaculitida indet. Tentaculitida indet. Ljaschenko 1955
Cephalopoda
Nautiloidea -	Nautiloidea indet. Nautiloidea indet. Agassiz 1847 nautiloid orthocones
Gastropoda
-	Gastropoda indet. Gastropoda indet. Cuvier 1795 snail
Bellerophontida -	Bellerophontoidea indet. Bellerophontoidea indet. M'Coy 1851 snail
Murchisoniina -	Murchisonioidea indet., Loxonematoidea indet. Murchisonioidea indet. Koken 1896 snail Loxonematoidea indet. Koken 1889 snail
Bivalvia
Nuculanida - Malletiidae	Myoplusia sulcata Myoplusia sulcata clam
Nuculanida - Cucullellidae	Nuculites sp. Nuculites sp. Conrad 1841 clam
Nuculida - Praenuculidae	Praenucula plicata Praenucula plicata clam
Nuculida - Cardiolariidae	Deceptrix subtrigonalis, Deceptrix elongata Deceptrix subtrigonalis clam Deceptrix elongata clam
Cyrtodontida - Antipleuridae	Dualina sp. Dualina sp. Barrande 1881 clam
Deuteropoda
-	Ostracoda indet. Ostracoda indet. Latreille 1802 ostracod
Trilobita
Phacopida - Homalonotidae	Trimerus (Trimerus) sp. Trimerus (Trimerus) sp. Green 1832 trilobite
Phacopida - Calymenidae	Flexicalymene sp., Calymene ferrifera Flexicalymene sp. Shirley 1936 trilobite Calymene ferrifera trilobite
Phacopida - Phacopidae	Ananaspis sp. Ananaspis sp. Campbell 1967 trilobite
Phacopida - Calmoniidae	Australoacaste palpalensis Australoacaste palpalensis trilobite
Phacopida - Acastidae	Acastidae indet. Acastidae indet. Delo 1935 trilobite
Lichida - Lichidae	Lichas cf. affinis Lichas cf. affinis Angelin 1854 trilobite
Odontopleurida - Odontopleuridae	Anacaenaspis sp. Anacaenaspis sp. Bruton 1967 trilobite
Anthozoa
Rugosa -	Rugosa indet. Rugosa indet. horn coral
Favositida - Micheliniidae	Pleurodictyum sp. Pleurodictyum sp. Goldfuss 1829 tabulate coral
Australonucula
- Similodontidae	Australonucula mesocarinata Australonucula mesocarinata