Llallagua Formation, SW Bolivia (Silurian of Bolivia)

Where: Bolivia (17.8° S, 64.8° W: paleocoordinates 46.5° S, 127.9° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Llallagua Formation, Llandovery (443.4 - 433.4 Ma)

• age based in part on occurrence of Monograptus turriculatus in overlying Kirusillas Formation

• formation-level stratigraphic resolution

Environment/lithology: marine; siliciclastic sediments

• "The Llallagua fauna belongs to the North Silurian Realm rather than to the Malvinokaffric Realm. This surprising conclusion suggests that a warm-water, near-shore currfent permitted the N. Hemisphere benthos to exist during the lat Llandovery in N and C Bolivia in about the BA 3 to 5 position."

Primary reference: G. Laubacher, A. J. Boucot, and J. Gray. 1982. Additions to Silurian stratigraphy, lithofacies, biogeography and paleontology of Bolivia and southern Peru. Journal of Paleontology 56(5):1138-1170 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 25084: authorized by Michael Foote, entered by Michael Foote on 27.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
 Phacopida - Dalmanitidae
Dalmanites sp. Barrande 1852 trilobite
Strophomenata
 Strophomenida - Sowerbyellidae
Plectodonta sp. Kozlowski 1929
 Strophomenida - Rafinesquinidae
Leptaena rhomboidalis Wahlenberg 1818
species name in quotes
Leptaena cf. rhomboidalis Wahlenberg 1818
 Strophomenida - Strophochonetidae
Protochonetes sp. Muir-Wood 1962
 Strophomenida - Chonetidae
Chonetes sp. Fischer de Waldheim 1830
Rhynchonellata
 Pentamerida - Syntrophiidae
 Orthida - Dalmanellidae
Dalmanellidae indet. Schuchert 1913
 Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
 Orthida - Orthidae
 Atrypida - Atrypidae
Atrypa reticularis Linnaeus 1758
species name in quotes