Zone B (upper) - Jama Formation (Pliocene of Ecuador)

Where: Manabi, Ecuador (0.2° N, 80.3° W: paleocoordinates 0.0° S, 79.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Jama Formation, Pliocene (5.3 - 2.6 Ma)

• Rests upon Miocene strata with a marked unconformity. Thickness is approximately 15 ft. Collection is from the upper part of Zone B.

• group of beds-level stratigraphic resolution

Environment/lithology: shoreface; poorly lithified, concretionary, blue, carbonaceous sandstone

• The upper part of this zone comprises mainly beach [shoreface] forms.
• Bluish sands, somewhat lignitic in the upper part, nodular in the lower.

Size class: macrofossils

Collection methods: quarrying,

• Probably collected by current authors, though text also makes referal to faunal lists by Sheppard (1930) and a collecton of Barker.

Primary reference: H. A. Pilsbry and A.A. Olsson. 1941. A Pliocene fauna from Western Ecuador. Proceedings of the Natural Sciences of Philadelphia 93:1-79 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51885: authorized by Austin Hendy, entered by Austin Hendy on 29.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for Mollusca; nomenclature probably outdated though accurate.
Gastropoda
 Cerithioidea - Turritellidae
Turritella pasada Pilsbry and Olsson 1941 turret shell
 Neogastropoda - Buccinidae
Phos cocosensis true whelk
 Neogastropoda - Columbellidae
Bivalvia
 Arcida - Noetiidae
 Pectinida - Pectinoidae
"Pecten tumbezensis" = Leptopecten tumbezensis
"Pecten tumbezensis" = Leptopecten tumbezensis d'Orbigny 1846 scallop
 Thraciida - Periplomatidae
"Periploma planiuscula" = Periploma (Periploma) planiuscula
"Periploma planiuscula" = Periploma (Periploma) planiuscula Sowerby I 1834 clam
 Cardiida - Veneridae
Chione (Chionopsis) venadoensis n. sp. Pilsbry and Olsson 1941 venus clam
"Anomalocardia callistoides" = Iliochione callistoides Pilsbry and Olsson 1941 venus clam
 Cardiida - Mactridae
"Mulinia pallida" = Mulinia pallida, "Mulinia camina n. sp." = Mulinia pallida
"Mulinia pallida" = Mulinia pallida Broderip and Sowerby 1829 clam
"Mulinia camina n. sp." = Mulinia pallida Broderip and Sowerby 1829 clam
 Cardiida - Cardiidae
Cardium (Trigoniocardia) cabopasadum n. sp. Pilsbry and Olsson 1941 cockle
 Cardiida - Donacidae
 Cardiida - Tellinidae
"Tellina (Quadrans) cognata" = Temnoconcha cognata
"Tellina (Quadrans) cognata" = Temnoconcha cognata Adams 1852 tellin clam
 Cardiida - Psammobiidae
"Sanguinolaria tellinoides" = Sanguinolaria (Sanguinolaria) tellinoides
"Sanguinolaria tellinoides" = Sanguinolaria (Sanguinolaria) tellinoides Adams 1850 clam