Trapa Trapa East mid-upper beds (Miocene to of Chile)

Also known as Laguna del Laja

Where: Bío Bío, Chile (37.7° S, 71.2° W: paleocoordinates 38.3° S, 66.4° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Cura-Mallín Formation, Santacrucian to Santacrucian (17.5 - 15.5 Ma)

• The Trapa Trapa East sequence preserves faunas that seem assignable to at least three distinct early–late Miocene SALMAs, from as old as Colhuehuapian or Santacrucian to at least as young as Friasian or Mayoan

• 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 140107: authorized by Carlos Jaramillo, entered by Juan Carrillo on 01.03.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Notoungulata -
Typotheria indet. Zittel 1892 notoungulate
 Notoungulata - Hegetotheriidae
? Hegetotherium sp. Ameghino 1887 notoungulate
 Notoungulata - Interatheriidae
Interatheriinae indet. Simpson 1945 notoungulate
 Glires -
Rodentia (aff. Incamys) sp. Savage 1951 rodent
Rodentia (aff. Alloiomys) sp. Savage 1951 rodent
 Rodentia - Eocardiidae
Luantus sp. Ameghino 1899 caviomorph
 Rodentia - Echimyidae
Prostichomys sp. Kramarz 2001 spiny rat
Maruchito sp. Vucetich et al. 1993 spiny rat
 Rodentia -
Acarechimys sp. Patterson 1965 caviomorph
Protacaremys sp. Ameghino 1902 caviomorph
 Sparassodonta -
Sipalocyon sp. Ameghino 1887 metatherian