Ullujaya, Chilcatay Formation (Miocene of Peru)

Where: Peru (14.6° S, 75.6° W: paleocoordinates 15.5° S, 71.5° W)

• coordinate stated in text

When: Chilcatay Formation, Burdigalian (20.4 - 16.0 Ma)

• Chilcatay Formation, latest Oligocene to early Miocene (Dunbar et al. 1990; DeVries 1998, 2001). Although the precise locality of the holotype is unknown, the referred specimen MUSM 1401 originates from within the Chilcatay Formation, several meters under the Chilcatay Formation - Pisco Formation disconformity, at Ullujaya, a few kilometers north to the type locality. Based on a published section a short distance from Ullujaya, the Chilcatay Formation layers of this locality (which preserves the fossilized remains of other marine vertebrates including mysticetes, kentriodontids, the squalodelphinids Huaridelphis raimondii Lambert, Bianucci & Urbina, 2014 and Notocetus vanbenedeni Moreno, 1892, and a stem physeteroid) are tentatively dated to the early Miocene (Alván De la Cruz 2008; Lambert et al. 2014; Bianucci et al. 2015).

• bed-level stratigraphic resolution

Environment/lithology: marine; diatomaceous siltstone and sandstone

• See Di Celma et al 2018.

•The Chilcatay Formation comprises marine diatomaceous and tuffaceous sandy siltstones, bioclastic sandstones and, along the base, massive sandstones, and large boulders of crystalline basement rocks.

Size class: macrofossils

Primary reference: O. Lambert, C. de Muizon, and G. Bianucci. 2015. A new archaic homodont toothed cetacean (Mammalia, Cetacea, Odontoceti) from the early Miocene of Peru. Geodiversitas 37(1):79-108 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 167732: authorized by Mark Uhen, entered by Mark Uhen on 30.03.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

 Odontaspidida - Alopiidae
Alopiidae indet. Bonaparte 1838 thresher shark
 Odontaspidida - Carcharodontidae
Cosmopolitodus hastalis Agassiz 1843 elasmobranch
 Euselachii -
Myliobatiformes indet. Compagno 1973 stingray
Rhinopristiformes indet. Last et al. 2016 ray
 Lamniformes - Otodontidae
Otodontidae indet. mackerel shark
 Lamniformes - Lamnidae
Lamnidae indet. Müller and Henle 1838 mackerel shark
Isurus oxyrinchus Rafinesque 1810 mako shark
 Lamniformes - Odontaspididae
"Odontaspidae indet." = Odontaspididae
"Odontaspidae indet." = Odontaspididae Müller and Henle 1839 sand tiger shark
 Carchariniformes - Carcharhinidae
Carcharhinidae indet. Jordan and Evermann 1896 requiem shark
Carcharhinus brachyurus Gunther 1870 requiem shark
 Carchariniformes - Sphyrnidae
Sphyrnidae indet. Gill 1872 hammerhead shark
 Carchariniformes - Hemigaleidae
Hemigaleidae indet. ground shark
 Istiophoriformes - Istiophoridae
cf. Makaira sp. Lacépède 1802
 Testudines - Dermochelyidae
Dermochelyidae indet. Lydekker 1889 leatherback
 Cetacea - Squalodelphinidae
Squalodelphinidae indet. Dal Piaz 1917 toothed whale
Huaridelphis raimondii Lambert et al. 2014 toothed whale
Notocetus vanbenedeni Moreno 1892 toothed whale
 Cetacea -
Physeteroidea indet. Gray 1868 toothed whale
 Cetacea - Kentriodontidae
Kentriodontidae indet. Slijper 1936 toothed whale
aff. Kentriodon pernix Kellogg 1927 toothed whale
 Cetacea -
Chilcacetus cavirhinus n. gen. n. sp.
Chilcacetus cavirhinus n. gen. n. sp. Lambert et al. 2015 toothed whale