Estero Trapa Trapa West (Miocene to of Chile)

Also known as Laguna del Laja

Where: Bío Bío, Chile (37.7° S, 71.2° W: paleocoordinates 38.2° S, 67.0° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Cura-Mallín Formation, Santacrucian to Santacrucian (17.5 - 11.8 Ma)

• The ranges of these taxa suggest a Santacrucian SALMA for the high northern Trapa Trapa West fossil-producing levels. It is more difficult to correlate the fauna from the highest part of the Trapa Trapa West sequence to a specific SALMA, although it may be as young as Laventan

• group of beds-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; volcaniclastic, muddy sandstone and conglomerate

• Our analyses indicate that the exposed thickness of the Cura-Mallin Fm southeast of Laguna del Laja exceeds 1800 m, consisting of interbedded predominantly-fluviatile volcaniclastics with minor facies

•possibly indicative of short-lived lacustrine phases

• Volcaniclastic sandstone, mudstone and granule conglomerate

Size class: macrofossils

Collected in 2001-2005; reposited in the SGOPV

Primary reference: J. J. Flynn, R. Charrier, D. A. Croft, P.B. Gans, T. M. Herriott, J. A. Wertheim, and A. R. Wyss. 2008. Chronologic implications of new Miocene mammals from the Cura-Mallín and Trapa Trapa formations, Laguna del Laja area, south Central Chile. Journal of South American Earth Sciences 26:412-426 [C. Jaramillo/J. Carrillo]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 140105: authorized by Carlos Jaramillo, entered by Juan Carrillo on 01.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Notoungulata - Toxodontidae
Toxodontidae indet. Ameghino 1889 notoungulate
 Notoungulata -
Typotheria indet. Zittel 1892 notoungulate
 Notoungulata - Hegetotheriidae
Pachyrukhinae indet. Kraglievich 1934 notoungulate
Paedotherium minor Cabrera 1937 notoungulate
Hegetotheriinae indet. Ameghino 1894 notoungulate
 Notoungulata - Interatheriidae
Interatheriinae indet. Simpson 1945 notoungulate
 Rodentia -
Caviomorpha indet. Wood and Patterson 1955 caviomorph
 Rodentia - Eocardiidae
Eocardiidae indet. Ameghino 1891 caviomorph
Luantus sp. Ameghino 1899 caviomorph
 Rodentia - Echimyidae
 Ungulata -
Astrapotheria indet. Lydekker 1894 placental
 Astrapotheria - Astrapotheriidae
Astrapotheriidae indet. Ameghino 1887 placental
 Xenarthra - Dasypodidae
Dasypodidae indet. Gray 1821 armadillo
 Paucituberculata - Abderitidae
Abderitidae indet. Ameghino 1889 marsupial