PBDB Collection

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. 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 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

Show authors, comments, and common names

unclassified
-	Conularida indet. Conularida indet.
Crinoidea
-	Crinoidea indet. Crinoidea indet. Miller 1821 Sea lily
Graptolithina
-	Graptolithina indet. Graptolithina indet. graptolite
Hyolitha
Hyolithida -	Hyolithida indet. Hyolithida indet. Mathew 1962
Strophomenata
Strophomenida - Strophochonetidae	? Protochonetes sp. ? Protochonetes sp. Muir-Wood 1962
Strophomenida - Leptestiidae	Leangella sp. Leangella sp. Opik 1933
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
Orthocerida - Dawsonoceratidae	Dawsonoceras sp. Dawsonoceras sp. Hyatt 1884
Gastropoda
-	Gastropoda indet. Gastropoda indet. Cuvier 1795 snail
Bellerophontida -	Bellerophontoidea indet. Bellerophontoidea indet. M'Coy 1851 snail
Murchisoniina - Murchisoniidae	Murchisoniidae indet. Murchisoniidae indet. Koken 1896 snail
Murchisoniina - Loxonematidae	Loxonematidae indet. Loxonematidae indet. Koken 1889 snail
Bivalvia
Nuculanida - Malletiidae	Myoplusia sulcata Myoplusia sulcata clam
Nuculanida - Cucullellidae	Nuculites sp. Nuculites sp. Conrad 1841 clam
Nuculoida -	"Nuculoida indet." = Nuculida "Nuculoida indet." = Nuculida Dall 1889 clam
Nuculida - Praenuculidae	Praenucula plicata Praenucula plicata clam
Nuculida - Cardiolariidae	Deceptrix elongata, Deceptrix subtrigonalis Deceptrix elongata clam Deceptrix subtrigonalis clam
Solemyida - Ctenodontidae	Ctenodonta sp., Praectenodonta alternata Ctenodonta sp. Salter 1852 clam Praectenodonta alternata clam
Cyrtodontida - Antipleuridae	Dualina sp. Dualina sp. Barrande 1881 clam
Trilobita
Phacopida - Homalonotidae	Trimerus (Trimerus) grandis, Trimerus (Trimerus) flexuosus Trimerus (Trimerus) grandis trilobite Trimerus (Trimerus) flexuosus trilobite
Phacopida - Calymenidae	Flexicalymene sp., Diacalymene subandina, Calymene ferrifera Flexicalymene sp. Shirley 1936 trilobite Diacalymene subandina trilobite Calymene ferrifera trilobite
Phacopida - Phacopidae	Zaplaops zaplensis, Ananaspis sp. Zaplaops zaplensis trilobite Ananaspis sp. Campbell 1967 trilobite
Phacopida - Dalmanitidae	Dalmanites sudamericanus, Dalmanites transglabelaris Dalmanites sudamericanus trilobite Dalmanites transglabelaris trilobite
Phacopida - Calmoniidae	Australoacaste palpalensis, Jujuyops nonoctubrensis Australoacaste palpalensis trilobite Jujuyops nonoctubrensis 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