Variegated Beds - Zorritos (Miocene of Peru)

Where: Peru (3.7° S, 80.7° W: paleocoordinates 4.9° S, 76.4° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Variegated Beds Member (Zorritos Formation), Early/Lower Miocene (23.0 - 16.0 Ma)

• middle unit of Zorritos Formation

• group of beds-level stratigraphic resolution

Environment/lithology: paralic; green, yellow shale and red, conglomeratic, carbonaceous sandstone

• brackish water forms such as Potamides, oysters and varieties of Arca chiriquiensis are rather characteristic

•marine fossils are worn

• red, green, yellowto chocolate-colored shales interbedded with rust-colored sandstones, white grits, cobble conglomerates and lignites

•seams of rather pure cannel coal may be present while fossil layers are frequent

•deformed beds probably due to intraformational creep and surface slumping

Primary reference: A. A. Olsson. 1932. Contributions to the Tertiary Paleontology of Northern Peru: Part 5, Miocene Mollusca. Bulletins of American Paleontology 19(68):1-272 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 66177: authorized by Linda Ivany, entered by Linda Ivany on 03.10.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• mollusks only
Gastropoda
 Neotaenioglossa - Calyptraeidae
Crepidula sp. Lamarck 1799 slipper shell
Calyptraea sp. Lamarck 1799 slipper shell
typo "Calytraea" corrected
 Cerithioidea - Cerithiidae
Cerithium grillanum Spieker 1922 cerith snail
Cerithium infranodatum Spieker 1922 cerith snail
 Cerithioidea - Turritellidae
"Turritella cf. infracarinata" = Turritella (Turritella) infracarinata Grzybowski 1899 turret shell
Turritella varicosta Spieker 1922 turret shell
 Cerithioidea - Potamididae
"Potamides ormei" = Potamides suprasulcatus Gabb 1873 horn snail
subsp. infraliratus
 Neogastropoda - Buccinidae
 Neogastropoda - Melongenidae
Melongena melongena Linnaeus 1758 snail
subsp. consors
 Neogastropoda - Conidae
"Conus (Dendroconus) bravoi" = Conus bravoi, "Conus (Dendroconus) cf. williamgabbi" = Conus williamgabbi
"Conus (Dendroconus) bravoi" = Conus bravoi Spieker 1922 cone shell
"Conus (Dendroconus) cf. williamgabbi" = Conus williamgabbi Maury 1917 cone shell
 Sorbeoconcha - Naticidae
"Polinices (Polinices) coronis" = Polinices stanislasmeunieri
"Polinices (Polinices) coronis" = Polinices stanislasmeunieri Maury 1917 moon snail
Bivalvia
 Arcida - Noetiidae
"Arca (Noetia) retractata" = Noetia
"Arca (Noetia) retractata" = Noetia clam
 Arcida - Arcidae
"Arca (Senilia) chiriquiensis" = Anadara (Grandiarca) chiriquiensis Gabb 1861 ark
Arca (Noetia) cholana Spieker 1922 ark
 Pectinida - Anomiidae
"Anomia berryi" = Anomia peruviana
"Anomia berryi" = Anomia peruviana d'Orbigny 1846 jingle
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Mytilida - Mytilidae
Mytilus sp. Linnaeus 1758 mussel
 Pholadida - Corbulidae
 Cardiida - Veneridae
Chione (Chionopsis) costaricensis Olsson 1922 venus clam
 Cardiida - Anatinellidae
"Labiosa (Raeta) undulata" = Raeta undulata
"Labiosa (Raeta) undulata" = Raeta undulata Gould 1851 clam
subsp. gardenerae
 Cardiida - Tellinidae
Macoma sp. Leach 1819 tellin clam