The Yecua Formation is a geological Formation in what is now Bolivia. Studies suggest that the Yecua Formation preserves a coastal setting with humid to semiarid floodplains, shorelines and tidal as well as shallow marine environments including marshes, streams, lakes and brackish bodies of water. There may have been a connection to the Amazon Basin or the Paranaense Sea.
Bivalves Name Species Member Material NotesTellinaT. spcf. Cyrenacf. C. spcf. Astartecf. A. spcf. Lucinacf. L. spSenisS. cf. elongatuscf. Corbula or Cymbophora sp.cf. C. spcf. Nuculacf. N. sp
Gastropods Name Species Member Material Notescf. Gyrodes or Natica sp.cf. Turritellacf. T. sp
Crustaceans Name Species Member Material NotesBythocyprisB. spCyprideisC. spcf. Balanuscf. B. spindetermined crabs
Vertebrates Name Species Member Material Notes Imagecf. Theosodoncf. T. spdistal limb bonea litopternRodentia indet.toothMourasuchusM. sp.skull fragments, partial vertebrae & ribsPleurodirashell elementsHumboldtichthysHumboldtichthys kirschbaumiincompletely preserved anterior portion of the body and posterior heada Glass KnifefishSiluriformes indet.possibly AriidaeCharaciformes or Clupeiformesa scale
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