ammonites
banner
Gateway to the Paleobiology Database
Quebrada Honda, Bolivia (Miocene of Bolivia)

Where: Tarija, Bolivia (22.0° S, 65.4° W: paleocoordinates 22.3° S, 62.0° W)

• coordinate stated in text

• local area-level geographic resolution

When: Honda Group, Middle Miocene (16.0 - 11.6 Ma)

• The formation is apparently unnamed. MacFadden et al., indicate that the locality is constrained by 40K/40Ar ages of 12.83 ± 0.11 Ma and 11.96 ± 0.11 Ma, and that the local magnetostratigraphy is correlated to chrons C5AA through C5A on the MPTS. The extrapolated age for the fossil mammals (based on paleomag) is 13.0 to 12.7 Ma = Laventan SALMA. Although specific statigraphic data were taken for the specimens collected by MacFadden and Wolff, these data were not provided in the publication. MacFadden et al. (1990) indicate that most of the fossil mammals come from a zone "between about 25 to 82 m within our composite measured section."

Environment/lithology: fluvial; silty, calcareous claystone and silty, sandy siliciclastic

• (From MacFadden and Wolff, 1981) "The section at Quebrada Honda is divisible into three major parts which appear to represent different environments of deposition. The first, or basal portion (lower quarter of section), consists primarily of extremely fossiliferous reddish-brown silty clays, silts, and sands. The majority of the fossils collected during 1978 cane from this part of the stratigraphic section. Near the edges of the Tertiary valley the silts and clays rest upon a basal breccia conglomerate formed by slope wash from the surrounding hills. This breccia conglomerate does not extend far toward the center of the basin;, where the silts and clays rest on the Paleozoic basement. The middle half of the section consists of slightly fossiliferous silty clays and numerous well-indurated calcareous zones that form prominent ledges and cliffs. The third portion (upper quarter) of the section consists of reddish-brown and yellowish-green clays and clay silts, zones of channel sands, gravels, and conglomerates. Quaternary deposits rest unconformably upon the Tertiary sediments at the top of the section. The uppermost Tertiary sediments yielded only rare bone fragments, and exposures are uncommon and difficult to work. Sixty-two paleomagnetic sites, each consisting of at least 3 separately-oriented hand samples, were collected from the finer-grained sediments in Sections 1 and 2 at Quebrada Honda (Fig. 2; stratigraphic separation between superposed sites averages 4-5 m. These samples are presently being analysed at the University of Florida Paleomagnetic Laboratory. The relatively thick stratigraphic section and closely spaced paleomagnetic sampling provides an excellent potential for establishing the age of the Quebrada Honda sequence by calibration to the Magnetic Polarity Time Scale. At least 8 ashes crop out in the Quebrada Honda sequence. Most of these appear to be sub-aerial deposits. Bulk ash samples (about 50 kg) were collected from Section 1, Unit 9 and Section 2, Unit 17. Preliminary laboratory examination of these samples demonstrates that (particularly Section 2, Unit 17), they have significant quantities of glass and zircons that would be datable by the fission-track method. In addition, hand samples of the other 6 ashes were collected in order to determine which of these are also potentially datable."

•From MacFadden et al., (1990): "These sections consist of about 300 m of principally fine-grained fluviatile sediments with predominant lithologies reddish brown and yellowish-green silty clays, silts, and fine sands. There are also coarser, lenticular challen sands and gravels, but these are localized."

Size classes: macrofossils, mesofossils

Preservation: permineralized

Reposited in the MNHN, MNHN (La Paz)

Collection methods: surface (float), surface (in situ), mechanical,

• Specimens are also curated at Florida Museum of Natural History.

Primary reference: R. Hoffstetter. 1977. Un gisement de mammifères miocènes à Quebrada Honda (sud Bolivien). Comptes Rendus de la Académie des Sciences, Paris, Sèrie D 284:1517-1520 [D. Croft/D. Croft/D. Croft] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 38071: authorized by Darin Croft, entered by Darin Croft on 08.04.2004, edited by Andrés Cardenas and Mark Uhen

Creative Commons license: CC BY (attribution)