Yecua Formation: Difference between revisions
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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]].<ref name=Hulka06>{{Cite journal|last1=Hulka|first1=C.|last2=Gräfe|first2=K.U.|last3=Sames|first3=B.|last4=Uba|first4=C.E.|last5=Heubeck|first5=C.|year=2006|title=Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia|journal=Journal of South American Earth Sciences| volume=21|issue=1–2 | pages= 135–150|doi=10.1016/j.jsames.2005.08.003}}</ref> |
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]].<ref name=Hulka06>{{Cite journal|last1=Hulka|first1=C.|last2=Gräfe|first2=K.U.|last3=Sames|first3=B.|last4=Uba|first4=C.E.|last5=Heubeck|first5=C.|year=2006|title=Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia|journal=Journal of South American Earth Sciences| volume=21|issue=1–2 | pages= 135–150|doi=10.1016/j.jsames.2005.08.003|bibcode=2006JSAES..21..135H }}</ref> |
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==Bivalves== |
==Bivalves== |
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|''[[Mourasuchus]]''<ref name=Tineo2015_p4>{{cite journal |last1=Tineo |first1=D.E. |last2=Bona |first2=P. |last3=Pérez |first3=L.M. |last4=Vergani |first4=G.D. |last5=González |first5=G. |last6=Poiré |first6=D.G. |last7=Gasparini |first7=Z. |last8=Legarreta |first8=P. |year=2015 |title=Palaeoenvironmental implications of the giant crocodylian ''Mourasuchus'' (Alligatoridae, Caimaninae) in the Yecua Formation (late Miocene) of Bolivia |url=https://www.researchgate.net/publication/271702404 |journal=[[Alcheringa (journal)|Alcheringa]] |volume=39 |issue=2 |pages=1–12|doi=10.1080/03115518.2015.967162 |hdl=11336/33274 |s2cid=129930697 |hdl-access=free }}</ref> |
|''[[Mourasuchus]]''<ref name=Tineo2015_p4>{{cite journal |last1=Tineo |first1=D.E. |last2=Bona |first2=P. |last3=Pérez |first3=L.M. |last4=Vergani |first4=G.D. |last5=González |first5=G. |last6=Poiré |first6=D.G. |last7=Gasparini |first7=Z. |last8=Legarreta |first8=P. |year=2015 |title=Palaeoenvironmental implications of the giant crocodylian ''Mourasuchus'' (Alligatoridae, Caimaninae) in the Yecua Formation (late Miocene) of Bolivia |url=https://www.researchgate.net/publication/271702404 |journal=[[Alcheringa (journal)|Alcheringa]] |volume=39 |issue=2 |pages=1–12|doi=10.1080/03115518.2015.967162 |bibcode=2015Alch...39..224T |hdl=11336/33274 |s2cid=129930697 |hdl-access=free }}</ref> |
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|''M. sp.'' |
|''M. sp.'' |
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Latest revision as of 12:33, 12 June 2024
| Yecua Formation | |
|---|---|
| Stratigraphic range: Late Langhian-Early Messinian (Colloncuran-Huayquerian) ~ | |
| Underlies | Tariquia Formation |
| Overlies | Petaca Formation |
| Thickness | ~50–300 m (160–980 ft) |
| Lithology | |
| Primary | Mudstone, Sandstone[1] |
| Other | Gypsum |
| Location | |
| Region | Chaco Basin |
| Country |  Bolivia |
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.[2]
Bivalves
[edit]| Name | Species | Member | Material | Notes |
|---|---|---|---|---|
| Tellina[1] | T. sp | |||
| cf. Cyrena[1] | cf. C. sp | |||
| cf. Astarte[1] | cf. A. sp | |||
| cf. Lucina[1] | cf. L. sp | |||
| Senis[1] | S. cf. elongatus | |||
| cf. Corbula or Cymbophora sp.[1] | cf. C. sp | |||
| cf. Nucula[1] | cf. N. sp |
Gastropods
[edit]| Name | Species | Member | Material | Notes |
|---|---|---|---|---|
| cf. Gyrodes or Natica sp.[1] | ||||
| cf. Turritella[1] | cf. T. sp |
Crustaceans
[edit]| Name | Species | Member | Material | Notes |
|---|---|---|---|---|
| Bythocypris[1] | B. sp | |||
| Cyprideis[1] | C. sp | |||
| cf. Balanus[1] | cf. B. sp | |||
| indetermined crabs [1] |
Vertebrates
[edit]| Name | Species | Member | Material | Notes | Image |
|---|---|---|---|---|---|
| cf. Theosodon[1] | cf. T. sp | distal limb bone | a litoptern |  | |
| Rodentia indet.[1] | tooth | ||||
| Mourasuchus[3] | M. sp. | skull fragments, partial vertebrae & ribs | |||
| Pleurodira[3] | shell elements | ||||
| Humboldtichthys[4] | Humboldtichthys kirschbaumi | incompletely preserved anterior portion of the body and posterior head | a Glass Knifefish | ||
| Siluriformes indet.[1] | possibly Ariidae | ||||
| Characiformes or Clupeiformes[1] | a scale |
References
[edit]- ^ a b c d e f g h i j k l m n o p q r Marshall, L.G.; Sempere, T.; Gayet, M. (1993). "The Petaca (Late Oligocene - Middle Miocene) and Yecua (Late Miocene) Formations of the Subandean-Chaco Basin, Bolivia, and their Tectonic Significance". Travaux et Documents des Laboratoires de Géologie de Lyon. 125: 291–301.
- ^ Hulka, C.; Gräfe, K.U.; Sames, B.; Uba, C.E.; Heubeck, C. (2006). "Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia". Journal of South American Earth Sciences. 21 (1–2): 135–150. Bibcode:2006JSAES..21..135H. doi:10.1016/j.jsames.2005.08.003.
- ^ a b Tineo, D.E.; Bona, P.; Pérez, L.M.; Vergani, G.D.; González, G.; Poiré, D.G.; Gasparini, Z.; Legarreta, P. (2015). "Palaeoenvironmental implications of the giant crocodylian Mourasuchus (Alligatoridae, Caimaninae) in the Yecua Formation (late Miocene) of Bolivia". Alcheringa. 39 (2): 1–12. Bibcode:2015Alch...39..224T. doi:10.1080/03115518.2015.967162. hdl:11336/33274. S2CID 129930697.
- ^ Albert, J.S.; Fink, W.L. (2010). "Phylogenetic relationships of fossil neotropical electric fishes (Osteichthyes: Gymnotiformes) from the upper Miocene of Bolivia". Journal of Vertebrate Paleontology. 27 (1): 17–25. doi:10.1671/0272-4634(2007)27[17:PROFNE]2.0.CO;2. S2CID 35007130.