Zone B (lower) - 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 lower part of Zone B.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, concretionary, blue sandstone

• The lower part of this zone comprises mainly deeper water [offshore?] 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 51886: 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• Exhaustive for Mollusca; nomenclature probably outdated though accurate.
Bivalvia
 Arcida - Arcidae
"Arca (Cunearca) aequitorialis" = Anadara (Cunearca), "Arca (Cunearca) zorritoensis" = Anadara (Cunearca) zorritoensis, "Arca (Scapharca) obesa" = Anadara (Anadara) obesa, "Arca (Argina) brevifrons" = Lunarca brevifrons
"Arca (Cunearca) aequitorialis" = Anadara (Cunearca) ark
"Arca (Cunearca) zorritoensis" = Anadara (Cunearca) zorritoensis Spieker 1922 ark
[entered as Arca (Cunearca) zorritensis]
"Arca (Scapharca) obesa" = Anadara (Anadara) obesa Sowerby 1833 ark
"Arca (Argina) brevifrons" = Lunarca brevifrons Sowerby I 1833 ark
 Arcida - Noetiidae
Noetia reversa Sowerby 1833 clam
Subspecies: Noetia reversa peruviana; new subspecies
 Pectinida - Pectinoidae
 Pectinida - Anomiidae
Placunanomia cumingii Broderip 1832 scallop
[entered as Placunanomia cumingi]
"Anomia peruviana" = Anomia (Anomia) peruviana d'Orbigny 1846 jingle
 Ostreida - Ostreidae
"Ostrea megodon" = Undulostrea megodon
"Ostrea megodon" = Undulostrea megodon Hanley 1846 oyster
 Carditida - Crassatellidae
"Eucrassatella gibbosa" = Hybolophus gibbosus
"Eucrassatella gibbosa" = Hybolophus gibbosus Sowerby 1832 clam
Subspecies: Eucrassatella gibbosa tucilla
 Pholadida - Corbulidae
"Corbula ovulata" = Caryocorbula ovulata
"Corbula ovulata" = Caryocorbula ovulata Sowerby 1835 clam
 Cardiida - Anatinellidae
"Labiosa undulata" = Raeta undulata
"Labiosa undulata" = Raeta undulata Gould 1851 clam
 Cardiida - Mactridae
"Mactra (Mactrella) alata" = Mactrellona alata, Harvella elegans, "Mactra (Micromactra) atacama n. sp." = Mactrotoma angusta
"Mactra (Mactrella) alata" = Mactrellona alata Spengler 1802 clam
Harvella elegans Sowerby 1825 clam
Subspecies: Harvella elegans tucilla
"Mactra (Micromactra) atacama n. sp." = Mactrotoma angusta Reeve 1854 surfclam
 Cardiida - Veneridae
"Anomalocardia callistoides n. sp." = Iliochione callistoides, Chione (Chionopsis) jamaniana n. sp., "Chione (Lirophora) gorgona n. sp." = Lirophora mariae, Pitar salanga, Clementia (Egesta) solida, Cyclinella galera n. sp.
"Anomalocardia callistoides n. sp." = Iliochione callistoides Pilsbry and Olsson 1941 venus clam
Chione (Chionopsis) jamaniana n. sp. Pilsbry and Olsson 1941 venus clam
"Chione (Lirophora) gorgona n. sp." = Lirophora mariae d'Orbigny 1846 venus clam
Pitar salanga Pilsbry and Olsson 1941 venus clam
Cyclinella galera n. sp. Pilsbry and Olsson 1941 venus clam
 Cardiida - Solecurtidae
Solecurtus broggii Pilsbry and Olsson 1941 clam
 Cardiida - Tellinidae
Tellina (Macaliopsis) aequizonata n. sp. Pilsbry and Olsson 1941 tellin clam
Macoma plebeia tellin clam
"Tellina (Eurytellina) panamanensis" = Eurytellina tellin clam
Tellina (Eurytellina) prora Hanley 1844 tellin clam
 Cardiida - Semelidae
Semele laevis Sowerby 1833 clam
 Cardiida - Cardiidae
"Laevicardium pedernalense n. sp." = Laevicardium (Laevicardium) substriatum, "Cardium (Trigoniocardia) spiekeri" = Trigoniocardia, Cardium (Trachycardium) ballenium n. sp.
"Laevicardium pedernalense n. sp." = Laevicardium (Laevicardium) substriatum Conrad 1837 cockle
"Cardium (Trigoniocardia) spiekeri" = Trigoniocardia cockle
Cardium (Trachycardium) ballenium n. sp. Pilsbry and Olsson 1941 cockle
Gastropoda
 Neogastropoda - Olividae
Oliva spicata olive snail
"Oliva angulata" = Oliva (Oliva) incrassata Lightfoot 1786 olive snail
 Neogastropoda - Columbellidae
"Strombina ecuadoriana n. sp." = Strombina (Sinuina) ecuadoriana, "Strombina recurva" = Strombina (Recurvina) recurva, Aesopus (Glyptaesopus) perornatus n. sp.
"Strombina ecuadoriana n. sp." = Strombina (Sinuina) ecuadoriana Pilsbry and Olsson 1941 snail
"Strombina recurva" = Strombina (Recurvina) recurva Sowerby 1832 snail
Aesopus (Glyptaesopus) perornatus n. sp. Pilsbry and Olsson 1941 dovesnail
 Neogastropoda - Buccinidae
Northia northiae Gray in Griffith & Pidgeon 1833 true whelk
Cymatophos galerus Pilsbry and Olsson 1941 true whelk
Metula amosi Vanatta 1913 true whelk
Phos cf. gaudens true whelk
Nassa tinosa n. sp. Pilsbry and Olsson 1941 true whelk
Hanetia boggsi n. sp. Pilsbry and Olsson 1941 true whelk
Hanetia ecuadorensis n. sp. Pilsbry and Olsson 1941 true whelk
Hanetia cymioides n. sp. Pilsbry and Olsson 1941 true whelk
 Neogastropoda - Nassariidae
Tritiaria ecuadoriana n. sp., "Nassa (Arcularia) puntablancoensis" = Nassarius (Arcularia)
Tritiaria ecuadoriana n. sp. Pilsbry and Olsson 1941 snail
"Nassa (Arcularia) puntablancoensis" = Nassarius (Arcularia) snail
 Neogastropoda - Cancellariidae
Cancellaria (Euclia) harpiformis n. sp., "Cancellaria (Peruclia) bulbulus" = Cancellaria (Pyruclia) bulbulus, "Cancellaria (Peruclia) solida" = Pyruclia solida, "Cancellaria (Cancellaria) yolandia n. sp." = Cancellaria yolandia, Cancellaria (Cancellaria) ventricosa
Cancellaria (Euclia) harpiformis n. sp. Pilsbry and Olsson 1941 snail
"Cancellaria (Peruclia) bulbulus" = Cancellaria (Pyruclia) bulbulus Sowerby 1832 snail
"Cancellaria (Peruclia) solida" = Pyruclia solida Sowerby 1832 snail
"Cancellaria (Cancellaria) yolandia n. sp." = Cancellaria yolandia Pilsbry and Olsson 1941 snail
 Neogastropoda - Muricidae
 Neogastropoda - Turridae
Crassispira guayana n. sp. Pilsbry and Olsson 1941 turrid
 Neogastropoda - Conidae
Conus cacuminatus Spieker 1922 cone shell
Conus pyriformis Reeve 1843 cone shell
Conus regularis Sowerby 1841 cone shell
 Neogastropoda - Terebridae
"Terebra (Strioterebrum) cracilenta" = Strioterebrum, Terebra (Strioterebrum) tumaca n. sp., Terebra (Strioterebrum) cuenca n. sp., Terebra (Terebra) elena n. sp.
"Terebra (Strioterebrum) cracilenta" = Strioterebrum auger snail
Terebra (Strioterebrum) tumaca n. sp. Pilsbry and Olsson 1941 auger snail
Terebra (Strioterebrum) cuenca n. sp. Pilsbry and Olsson 1941 auger snail
Terebra (Terebra) elena n. sp. Pilsbry and Olsson 1941 auger snail
 Ficoidea - Ficidae
 Naticoidea - Naticidae
Natica marochiensis Gmelin 1791 moon snail
"Eupleura muriciformis" = Euspira muriciformis Broderip 1833 moon snail
Polinices rapulum moon snail
 Cypraeoidea - Cypraeidae
"Cypraea cayapa n. sp." = Muracypraea cayapa
"Cypraea cayapa n. sp." = Muracypraea cayapa Pilsbry and Olsson 1941 cowry
 Calyptraeoidea - Calyptraeidae
Crepidula sp. Lamarck 1799 slipper shell
 Tonnoidea - Personidae
"Distorsio decussatus" = Distorsio decussata
"Distorsio decussatus" = Distorsio decussata Valenciennes 1832 snail
 Tonnoidea - Tonnidae
Malea ringens Swainson 1822 tun shell
 Tonnoidea - Bursidae
"Bursa nana" = Marsupina nana
"Bursa nana" = Marsupina nana Broderip and Sowerby 1829 frog shell
 Tonnoidea - Cassidae
 Sorbeoconcha - Campanilidae
"Cerithium stercusmuscarum" = Cerithium (Thericium) stercusmuscarum
"Cerithium stercusmuscarum" = Cerithium (Thericium) stercusmuscarum Valenciennes 1833 snail
 Sorbeoconcha - Turritellidae
Turritella pasada n. sp. Pilsbry and Olsson 1941 turret shell
 Architectonicoidea - Architectonicidae
"Architectonica nobilis" = Architectonica nobilis, "Architectonica sexlinearis" = Architectonica nobilis
"Architectonica nobilis" = Architectonica nobilis Röding 1798 sundial
"Architectonica sexlinearis" = Architectonica nobilis Röding 1798 sundial