Gateway to the Paleobiology Database
Laguna Umayo, Chulpas level (Paleocene to of Peru)

Also known as LURMU

Where: Puno, Peru (15.7° S, 70.2° W: paleocoordinates 18.3° S, 59.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Muñani Formation, Late/Upper Paleocene to Late/Upper Paleocene (58.7 - 48.6 Ma)

• Lower Muñani Formation. Likely correlative to Chron 26r (early Late Paleocene) or Chron 24r (latest Paleocene–earliest Eocene), or, less likely, to Chron 29r (latest Cretaceous–earliest Paleocene). Correlation to Chron 24r is favored (Sige et al. 2004).

•Originally attributed to Vilquechico Formation (Maastrichtian-Danian) on paleobotanical evidence (charophytes).

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; argillaceous, calcareous conglomerate and lithified sandstone

• "The fossils are found in thin banks of heterogeneous sediment, a sort of microconglomerate formed from fine, irregular, more or less rounded calcareous nodules, and clayey and partially calcitic cement. Within these beds, some last thin clay layers preserve dessication marks. This matrix is often superficially altered and friable, more compact in-depth. The series includes several beds of this nature, which alternate with thicker deposits of red clays, grayish-red marls, and banks of compact sandstone. Throughout this ensemble, and particularly in the fossiliferous levels, cross-bedded stratifications abound. At the base, the series rests by soft layers (clays?) on an ensemble where compact sandstones dominate in thick banks. At the summit, they terminate by a strong thickness of soft beds, and pass to an essentially detritic ensemble, beginning with very ferruginous sandstones." (Translation by M. Carrano)

Size classes: macrofossils, mesofossils

Collected in 1993 onwards

Primary reference: B. Sigé, T. Sempere, R. F. Butler, L. G. Marshall, and J.-Y. Crochet. 2004. Age and stratigraphic reassessment of the fossil-bearing Laguna Umayo red mudstone unit, SE Peru, from regional stratigraphy, fossil record, and paleomagnetism. Geobios 37:771-794 [P. Mannion/P. Mannion] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 132938: authorized by Philip Mannion, entered by Philip Mannion on 29.08.2012

Creative Commons license: CC BY (attribution)