Casa Saman - [Lagunitas Sandstone, Vedun Fm] (Eocene of Peru)

Where: Piura, Peru (4.7° S, 81.3° W: paleocoordinates 12.6° S, 109.9° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Lagunitas Sandstone Member (Verdun Formation), Bartonian (41.3 - 38.0 Ma)

• Regarded as lower Upper Eocene on the basis of faunal similarity. Foraminifera suggest an upper Eocene age. Olsson states that the Talara and Saman rocks can be referred to the Upper Eocene and in terms of the European section, to the Bartonian and Ludian.....respectively? The Verdun Formation is presumably (by Olsson) correlated to the Saman Formation, although this has been complicated by a lack of exposures in the intermediate area. The Lagunitas Sandstone belongs to the upper part of the Verdun Formation. They are directly overlain by the Chira Shales and achieve a thickness of about 600 ft in thickness.

• formation-level stratigraphic resolution

Environment/lithology: submarine fan; poorly lithified, coarse-grained sandstone

• Formation composed of turbidites and debris flows
• Coarse, gritty sandstones.

Size class: macrofossils

Collection methods: quarrying,

• No museum repositories are reported, but material my presumably be the AMNH of PRI collections. Because of uncertaintly this field is left ommited.

Primary reference: A. A. Olsson. 1930. Contributions to the Tertiary Paleontology of Northern Peru: Part 3, Eocene Mollusca. Bulletins of American Paleontology 17(62):1-164 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 52525: authorized by Austin Hendy, entered by Austin Hendy on 10.08.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for Mollusca.
 Arcida - Arcidae
"Arca (Argina) samanensis" = Arginella samanensis
"Arca (Argina) samanensis" = Arginella samanensis Olsson 1929 clam
 Arcida - Glycymerididae
Glycymeris sp. Da Costa 1778 clam
 Ostreida - Ostreidae
Ostrea samanensis Olsson 1928 oyster
 Carditida - Carditidae
Venericardia (Venericor) samanensis Olsson 1928 clam
Subspecies: Venerciardia planicosta var samanensis
 Cardiida - Veneridae
"Pitaria samanensis" = Lamelliconcha samanensis
"Pitaria samanensis" = Lamelliconcha samanensis Olsson 1928 venus clam
 Architaenioglossa - Ampullinidae
Ampullina ortoni Gabb 1870 snail
 Neogastropoda - Olivellidae
Olivancillaria peruviana Woods 1922 snail
 Neogastropoda - Buccinidae
Dorsanum lagunitensis Woods 1922 true whelk
 Neogastropoda - Melongenidae
Melongena sp. Schumacher 1817 snail
 Neogastropoda - Volutidae
Plejona (Volutocorbis) sula n. sp. Olsson 1930 volute
 Neogastropoda - Harpidae
Morum peruvianum n. sp. snail
 Neogastropoda - Turridae
Scobinella sp. Conrad 1848 turrid
 Neogastropoda - Conidae
"Conus chiraensis" = Conus sauridens chiraensis
"Conus chiraensis" = Conus sauridens chiraensis Olsson 1930 cone shell
 Neogastropoda - Terebridae
Terebra sp. Bruguière 1789 auger snail
 Stromboidea - Strombidae
Ectinochilus gaudichaudi d'Orbigny 1842 true conch
 Tonnoidea - Cassidae
"? Sconsia samanica" = Doliocassis samanica
"? Sconsia samanica" = Doliocassis samanica Olsson 1928 snail
 Sorbeoconcha - Turritellidae
Turritella chira Olsson 1928 turret shell
Turritella samanensis Olsson 1928 turret shell
 Sorbeoconcha - Cerithiidae
Cerithium sp. Bruguière 1789 cerith snail
"Tympanotomus lagunitensis" = Cerithium (Tympanotonus) cerith snail
 Sorbeoconcha - Pachychilidae
Faunus ? lagunitensis Woods 1922 snail
 Architectonicoidea - Architectonicidae
Architectonica sullana Olsson 1928 sundial