V-4527 (Miocene of Colombia)

Also known as Unit Between Upper and Lower Red Bed

Where: Huila, Colombia (3.2° N, 75.2° W: paleocoordinates 2.6° N, 72.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Villavieja Formation (Honda Group), Laventan (13.8 - 11.8 Ma)

• Unit Between Upper and Lower Red Bed

Environment/lithology: fluvial; lithology not reported

• "Above the basal sandstone lie sandstone lenses and tongues—some thick, some thin—interbedded with silt and claystone. The sandstones show little evidence of cross-bedding. Detrital grains are for the most part rounded to subrounded quartz. Subangular to angular fragments of hornblende and rather large plates of mica make up about 5 per cent of the remaining identifiable fraction. Individual lenses and tongues are of restricted lateral extent. The interbedded clay and silt show few traces of stratification. At the base the silts contain a high percentage of sandy material but upward they become almost shaly.

•At the top of this unit is a ledge-forming sandstone that contains small irregular lenses of gravel. The base is locally conglomeratic and contains numerous clay balls, some as much as 9 centimeters in diameter, that seem to have come from the underlying clay. In the area south of Los Mangos this unit, with its resistant sands and broad benches that dip southward, has diverted drainage south and west into the Upper Red Bed and from there into the Quebrada Las Lajas (map 2). Around the headwaters of the Quebrada La Venta and eastward to the headwaters of the Quebrada Tatacoa certain beds in this unit are tuffaceous and contain minute glass shards and pumice fragments." (Fields, 1959)

Size class: macrofossils

Primary reference: S. Johnson. 1984. Astrapotheres from the Miocene of Colombia, South America. [A. Cardenas /L. Mora-Rojas/L. Mora-Rojas]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 187718: authorized by Andrés Cardenas, entered by Laura Mora-Rojas on 08.08.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Rodentia - Dinomyidae
Scleromys schurmanni1 Stehlin 1940 caviomorph
UCMP 39913
 Xenarthra - Mylodontidae
Mylodontidae indet.2 Ameghino 1889 edentate
Scelidothere, UCMP 38890
Pseudoprepotherium confusum2 Hirschfeld 1985 edentate
Hirschfeld 1985, UCMP 38887
 Ungulata - Astrapotheriidae
Xenastrapotherium kraglievichi3 Cabrera 1929 eutherian
UCMP 38063, UCMP 38885
Granastrapotherium snorki Johnson and Madden 1997 eutherian
UCMP 39217