Also known as MTM

Where: Caraveli, Peru (15.6° S, 74.8° W: paleocoordinates 15.8° S, 73.4° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Pisco Formation, Messinian (7.2 - 5.3 Ma)

• 4.5-6 Ma (Stucchi & Urbina, 2004); 7.3 - 7.0 Ma (Ehret et al 2012)

•MTM horizon at Montemar, Sacaco Area, Caraveli Province, Arequipa, Peru (Fig. 1A). This horizon ranges from 7.3 to 7.0 Ma (latest Tortonian–earliest Messinian, late Miocene)

•

•Bosio et al. 2020: Strontium isotope stratigraphy suggests Langhian–Serravallian age (14.8–12.4 Ma) for the P0 sequence of the Pisco Formation (see Fig. 9). Overlying P1 and P2 layers (including SAO horizon) reflects cooling from the late Serravallian–Messinian onwards. Bosio et al. 2019 use Ar dating of tephra layers within the Pisco Fm. with results suggesting P1 age between 9.5 and 8.6 Ma, and that of P2 between 8.4 and 6.7 Ma.

• group of beds-level stratigraphic resolution

Environment/lithology: paralic; diatomaceous siltstone

Size class: macrofossils

Preservation: original phosphate

Collection methods: surface (in situ),

Primary reference: R. Marocco and C. d.e. Muizon. 1988. Los vertebrados del Neogeno de La Costa Sur del Perú: Ambiente sedimentario y condiciones de fosilización. Bulletin de l'Institut Frances d'Etudes Andines 17(2):105-117 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 46084: authorized by Mark Uhen, entered by Mark Uhen on 01.01.2005, edited by John Alroy and Philip Mannion

Creative Commons license: CC BY (attribution)