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.
Paleobiota
PaleobiotaGenusSpeciesHigher taxonNotesImagesBolivosteusB. chacomensisAsterosteidaeOnly known placoderm from the Malvinokaffric realmPucapampellaP. rodrigaeStem-ChondrichthyesAlso known from the Icla Formation, one of the most basal known cartilaginous fishTuberocrinusT. lapazensisTuberocrinidae (Camerata)Placed in a monotypic familyAenigmaticumcrinusA. rochacamposiAenigmaticumcrinidae (Camerata)Named due to its unusual morphology in relation to other related crinoidsCtenocrinusC. branisaiMelocrinitidae (Monobathrida)BoliviacrinusB. isaacsoniPatelliocrinidae (Monobathrida)PachyblastusP. dickiNymphaeoblastidae (Blastoidea)FenestraspisF. amautaDalmanitidaeHas large fenestrae (holes) on its pleural regions (sides of the body)ChacomurusC. confragosusDalmanitidaeMaurotarionM. legrandiAulacopleuridae (Proetida)BainellaB. (Belenops) insolitaCalmoniidaeDeltacephalaspisD. (Deltacephalaspis) magister, D. (Prestalia) sp.CalmoniidaeAcastoides??A. verneuiliAcastidaeTarijactinoidesT. tikanensisCalmoniidaeParabouleiaP. calmonensisCalmoniidaeKozlowskiaspisK. (Romanops) borealisCalmoniidaePhacopinaP. cf. convexaCalmoniidaePlesiomalvinellaP. pujravii, P. bouleiCalmoniidaeMalvinellaM. buddaeCalmoniidaePalpebropsP. donegalensisCalmoniidaeVogesinaV. aspera, V. lacunaferaCalmoniidaeFormerly classed within the genus PhacopinaNeobactrothecaN. pharetraOrthothecidaBolithecaB. steinmanniOrthothecida”Hyolithes””H”. dorbignyiHyolithidaChonostrophiaC. truyolsaeChonostrophiidae (Chonetidina)AseptonetesA. isaacsoniChonetidae (Chonetidina)TropidoleptusT. carinatusTropidoleptidae (Terebratulida)SchuchertellaS. sp?Schuchertellidae (Orthotetida)NotiochonetesN. falklandicaChonetidae (Chonetidina)AustronopliaA. stuebeliAnopliidae (Chonetidina)AntelocoeliaA. johnsoniLeptocoeliidae (Atrypoidea)AustralocoeliaA. palmataLeptocoeliidae (Rhynchonellida)MeristelloidesM. rikowskiiMeristellidae (Athyridida)AustrlospiriferA. hawkinsiDelthyrididae (Spiriferida)MetaplasiaM. pseudoumbonataAmbocoeliidae (Spiriferida)ScaphiocoeliaS. boliviensisMutationellidae (Terebratulida)CryptonellaC. bainiCryptonellidae (Terebratulida)
References