southeast of Playa Yumaque (Eocene of Peru)

Also known as Paracas Reserve

Where: Peru (13.9° S, 76.3° W: paleocoordinates 16.2° S, 68.8° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Otuma Formation, Priabonian (38.0 - 33.9 Ma)

• "A late Eocene age for much of the Otuma Formation including [the fossiliferous horizon]... is supported by ash beds in the Río Ica Valley south of the Reserva Paracas, with 40Ar-39Ar dates of 37.2 and 36.5 Ma in the lower part of the sequence and an ash with an 40Ar-39Ar date of 35.7 Ma in the upper part of the sequence"

•JA: originally entered as Late Eocene because the older dates might have reached into the Bartonian, but the 2010 IUGS timescale implies they are earliest Priabonian

• bed-level stratigraphic resolution

Environment/lithology: coastal; lithified, fine-grained sandstone

• possibly shoreface based on description
• "sandstone bed... within a ~20- meter section of thick-bedded indurated medium-grained sandstone interbedded with less indurated, finer-grained, thin-bedded and laminated sandstone" [bed presumably is of the latter lithology based on preservation of specimen]

Size class: macrofossils

Preservation: adpression, soft parts

Collection methods: collecting details not given

•reposited in the Museo de Historia Natural-UNMSM, Lima

Primary reference: J. A. Clarke, D. T. Ksepka, R. Salas-Gismondi, A. J. Altamirano, M. D. Shawkey, L. D’Alba, J. Vinther, T. J. DeVries, and P. Baby. 2010. Fossil evidence for evolution of the shape and color of penguin feathers. Science 330 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 98346: authorized by John Alroy, entered by John Alroy on 02.10.2010, edited by Mihaela Krause and Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

• sharks and bivalves are presumably identifiable
Bivalvia indet. Linnaeus 1758 clam
"infaunal marine bivalves"
 Carditida - Crassatellidae
Crassatella pedroi1 Devries 2016 clam
 Carditida - Carditidae
Cardita newelli2 Rivera 1957 clam
 Pholadida - Raetomyidae
Amotapus arbolensis2 Woods 1922 clam
 Cardiida - Veneridae
"Dosinia" lechuzaensis2 Rivera 1957 venus clam
 Stromboidea - Strombidae
"Ectinochilus sp." = Rimella2
"Ectinochilus sp." = Rimella2 Agasiz 1841 true conch
 Stromboidea - Aporrhaidae
Peruchilus culberti Olsson 1931 snail
 Ficoidea - Ficidae
Ficus chiraensis2 Olsson 1931 fig shell
 Sorbeoconcha - Turritellidae
"Turritella cochleiformis" = Cristispira cochleiformis2, Turritella woodsi2
"Turritella cochleiformis" = Cristispira cochleiformis2 Gabb 1869 turret shell
Turritella woodsi2 Lisson 1925 turret shell
 Selachii -
Selachii indet. shark
"shark teeth"
 Clupeiformes - Clupeoidei
Engraulis sp. Cuvier 1817 hering
 Clupeiformes -
Sardinops sp. Hubbs 1929
 Ornithurae - Pelagornithidae
Pelagornithidae indet.2 Fürbringer 1888 bird
 Sphenisciformes -
Inkayacu paracasensis n. gen. n. sp.
Inkayacu paracasensis n. gen. n. sp. Clarke et al. 2010 penguin