Inchasi (Pliocene of Bolivia)

Where: Linares, Bolivia (19.7° S, 65.5° W: paleocoordinates 19.8° S, 64.5° W)

• coordinate stated in text

• local area-level geographic resolution

When: Chapadmalalan (4.0 - 3.0 Ma)

• Boscaini et al 2018: Its fossiliferous beds have been dated to between 4.0 and 3.3 Myr (late Early Pliocene; MacFadden et al., 1993; Anaya & MacFadden, 1995).The Inchasi locality is Chapadmalalan in age (Cione & Tonni, 1996).

•"a 120 m thick [composite] section" and "numerous fossiliferous horizons" (nine shown on a figure) were found in all five measured sections, spanning approximately the 35 - 110 m interval

•the entire section is estimated to span 0.61 m.y. and correlate with the Cochiti through Mammoth subchrons of the Gilbert and Gauss chrons based on paleomagnetic stratigraphy

• member-level stratigraphic resolution

Environment/lithology: fluvial; conglomerate and siltstone

• "the dominant lithologies are high-energy fluvial gravels interbedded with finer-grained clays and silts"

Size class: macrofossils

Collection methods: initial collections were made in 1989 by the authors

Primary reference: B. J. MacFadden, F. Anaya, and J. Argollo. 1993. Magnetic polarity stratigraphy of Inchasi: a Pliocene mammal-bearing locality from the Bolivian Andes deposited just before the Great American Interchange. Earth and Planetary Science Letters 114(2-3):229-241 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 71112: authorized by John Alroy, entered by John Alroy on 18.04.2007, edited by Juan Carrillo, Carlos Jaramillo and Miranta Kouvari

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Rodentia - Hydrochoeridae
 Rodentia - Caviidae
Caviodon sp. Ameghino 1885 caviomorph
 Panameriungulata - Macraucheniidae
Promacrauchenia sp. Ameghino 1904 placental
 Cingulata - Glyptodontidae
Plohophorus sp. Ameghino 1887 glyptodon
Paraglyptodon sp. Castellanos 1932 glyptodon
 Cingulata - Pampatheriidae
Plaina sp. Castellanos 1927 edentate
Plaina intermedia1 Castellanos 1937 edentate
 Megatherioidea - Megatheriidae
Megatheriinae indet. Gill 1872 edentate
  - Mylodontidae
Proscelidodon patrius Ameghino 1888 edentate
Mylodontinae indet. Gill 1872 edentate
Simomylodon uccasamamensis2 Saint-André et al. 2010 edentate
re-assigned to Simomylodon uccasamamensis by Boscaini et al 2018
 Notoungulata - Toxodontidae
Posnanskytherium sp. Liendo Lazarte 1943 notoungulate
Posnanskytherium inchasense n. sp.1 Anaya and MacFadden 1995 notoungulate
Posnanskytherium desaguaderoi Liendo Lazarte 1943 notoungulate
 Notoungulata - Mesotheriidae
Mesotheriidae indet. Alston 1876 notoungulate
said to be new
Hypsitherium bolivianum n. gen. n. sp.1 Anaya and MacFadden 1995 notoungulate