Belén Formation
Geologic formation in Bolivia
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The Belèn Formation is an early Devonian formation from Bolivia. It preserves a moderately diverse fauna of trilobites, crinoids and a few species of jawed fish, and is equivalent to the Icla Formation further east.
| Belèn Formation | |
|---|---|
| Stratigraphic range: Pragian - Emsian | |
| Type | Geological formation |
| Underlies | Sicasica Formation |
| Overlies | Vila Vila Formation |
| Location | |
| Region | Altiplano |
| Country | Bolivia |
Paleobiota
Color key
|
Notes Uncertain or tentative taxa are in small text; |
| Paleobiota | |||||
|---|---|---|---|---|---|
| Genus | Species | Higher taxon | Notes | Images | |
| Bolivosteus | B. chacomensis | Asterosteidae | Only known placoderm from the Malvinokaffric realm[1] |  | |
| Pucapampella | P. rodrigae | Stem-Chondrichthyes | Also known from the Icla Formation, one of the most basal known cartilaginous fish[2] |  | |
| Tuberocrinus | T. lapazensis | Tuberocrinidae (Camerata) | Placed in a monotypic family[3] | ||
| Aenigmaticumcrinus | A. rochacamposi | Aenigmaticumcrinidae (Camerata) | Named due to its unusual morphology in relation to other related crinoids[3] | ||
| Ctenocrinus | C. branisai | Melocrinitidae (Monobathrida)[4] | |||
| Boliviacrinus | B. isaacsoni | Patelliocrinidae (Monobathrida)[4] | |||
| Pachyblastus | P. dicki | Nymphaeoblastidae (Blastoidea)[4] | |||
| Fenestraspis | F. amauta | Dalmanitidae | Has large fenestrae (holes) on its pleural regions (sides of the body)[5] | ||
| Chacomurus | C. confragosus | Dalmanitidae[6] | |||
| Maurotarion | M. legrandi | Aulacopleuridae (Proetida)[7] | |||
| Bainella | B. (Belenops) insolita | Calmoniidae[8] | |||
| Deltacephalaspis | D. (Deltacephalaspis) magister, D. (Prestalia) sp. | Calmoniidae[8] | |||
| Acastoides? | ?A. verneuili[8] | Acastidae | |||
| Tarijactinoides | T. tikanensis | Calmoniidae[8] | |||
| Parabouleia | P. calmonensis | Calmoniidae[8] | |||
| Kozlowskiaspis | K. (Romanops) borealis | Calmoniidae[8] | |||
| Phacopina | P. cf. convexa | Calmoniidae[8] | |||
| Plesiomalvinella | P. pujravii, P. boulei | Calmoniidae[9] | |||
| Malvinella | M. buddae | Calmoniidae[9] | |||
| Palpebrops | P. donegalensis | Calmoniidae[9] | |||
| Vogesina | V. aspera, V. lacunafera | Calmoniidae | Formerly classed within the genus Phacopina[9] | ||
| Neobactrotheca | N. pharetra | Orthothecida[10] | |||
| Bolitheca | B. steinmanni | Orthothecida[11] | |||
| ”Hyolithes” | ”H”. dorbignyi | Hyolithida[11] | |||
| Chonostrophia | C. truyolsae | Chonostrophiidae (Chonetidina)[12] | |||
| Aseptonetes | A. isaacsoni | Chonetidae (Chonetidina)[12] | |||
| Tropidoleptus | T. carinatus | Tropidoleptidae (Terebratulida)[13] | |||
| Schuchertella | S. sp? | Schuchertellidae (Orthotetida)[13] | |||
| Notiochonetes | N. falklandica | Chonetidae (Chonetidina)[13] | |||
| Austronoplia | A. stuebeli | Anopliidae (Chonetidina)[13] | |||
| Antelocoelia | A. johnsoni | Leptocoeliidae (Atrypoidea)[14] | |||
| Australocoelia | A. palmata | Leptocoeliidae (Rhynchonellida)[14] | |||
| Meristelloides | M. rikowskii | Meristellidae (Athyridida)[14] | |||
| Austrlospirifer | A. hawkinsi | Delthyrididae (Spiriferida)[14] | |||
| Metaplasia | M. pseudoumbonata | Ambocoeliidae (Spiriferida)[14] | |||
| Scaphiocoelia | S. boliviensis | Mutationellidae (Terebratulida)[14] | |||
| Cryptonella | C. baini | Cryptonellidae (Terebratulida)[14] | |||