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• Exhaustive for Mollusca; nomenclature probably outdated though accurate.
Gastropoda
 Neotaenioglossa - Calyptraeidae
Crepidula sp., "Crucibulum (Dispotaea) imbricatum" = Crucibulum (Dispotaea) imbricata
Crepidula sp. Lamarck 1799 slipper shell
"Crucibulum (Dispotaea) imbricatum" = Crucibulum (Dispotaea) imbricata Sowerby 1824 slipper shell
 Cerithioidea - Turritellidae
Turritella pasada n. sp. Pilsbry and Olsson 1941 turret shell
 Pseudomelanoidea - Pseudomelaniidae
Crassispira guayana n. sp. Pilsbry and Olsson 1941 snail
 Sorbeoconcha - Campanilidae
"Cerithium stercusmuscarum" = Cerithium (Thericium) stercusmuscarum
"Cerithium stercusmuscarum" = Cerithium (Thericium) stercusmuscarum Valenciennes 1833 snail
 Neogastropoda - Olividae
"Oliva angulata" = Oliva (Oliva) incrassata Lightfoot 1786 olive snail
Oliva spicata Durham 1950 olive snail
 Neogastropoda - Buccinidae
Nassa tinosa n. sp. Pilsbry and Olsson 1941 true whelk
Cymatophos galerus Pilsbry and Olsson 1941 true whelk
Metula amosi Vanatta 1913 true whelk
Northia northiae Gray in Griffith & Pidgeon 1833 true whelk
Hanetia cymioides n. sp. Pilsbry and Olsson 1941 true whelk
Hanetia ecuadorensis n. sp. Pilsbry and Olsson 1941 true whelk
Hanetia boggsi n. sp. Pilsbry and Olsson 1941 true whelk
Phos cf. gaudens true whelk
 Neogastropoda - Nassariidae
"Nassa (Arcularia) puntablancoensis" = Nassarius (Arcularia), Tritiaria ecuadoriana n. sp.
"Nassa (Arcularia) puntablancoensis" = Nassarius (Arcularia) snail
Tritiaria ecuadoriana n. sp. Pilsbry and Olsson 1941 snail
 Neogastropoda - Columbellidae
"Strombina recurva" = Strombina (Recurvina) recurva, "Strombina ecuadoriana n. sp." = Strombina (Sinuina) ecuadoriana, Aesopus (Glyptaesopus) perornatus n. sp.
"Strombina recurva" = Strombina (Recurvina) recurva Sowerby 1832 snail
"Strombina ecuadoriana n. sp." = Strombina (Sinuina) ecuadoriana Pilsbry and Olsson 1941 snail
Aesopus (Glyptaesopus) perornatus n. sp. Pilsbry and Olsson 1941 dovesnail
 Neogastropoda - Conidae
Conus cacuminatus Spieker 1922 cone shell
Conus pyriformis Reeve 1843 cone shell
Conus regularis Sowerby 1841 cone shell
 Neogastropoda - Terebridae
Terebra (Terebra) elena n. sp., "Terebra (Strioterebrum) cracilenta" = Strioterebrum, Terebra (Strioterebrum) tumaca n. sp., Terebra (Strioterebrum) cuenca n. sp.
Terebra (Terebra) elena n. sp. Pilsbry and Olsson 1941 auger snail
"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
 Neogastropoda - Muricidae
Eupleura muriciformis Broderip 1833 murex snail
 Neogastropoda - Cancellariidae
"Cancellaria (Peruclia) bulbulus" = Cancellaria (Pyruclia) bulbulus, "Cancellaria (Peruclia) solida" = Pyruclia solida, Cancellaria (Euclia) harpiformis n. sp., Cancellaria (Cancellaria) ventricosa, "Cancellaria (Cancellaria) yolandia n. sp." = Cancellaria yolandia
"Cancellaria (Peruclia) bulbulus" = Cancellaria (Pyruclia) bulbulus Sowerby 1832 snail
"Cancellaria (Peruclia) solida" = Pyruclia solida Sowerby 1832 snail
Cancellaria (Euclia) harpiformis n. sp. Pilsbry and Olsson 1941 snail
"Cancellaria (Cancellaria) yolandia n. sp." = Cancellaria yolandia Pilsbry and Olsson 1941 snail
 Sorbeoconcha - Ficidae
 Sorbeoconcha - Personidae
"Distorsio decussatus" = Distorsio decussata
"Distorsio decussatus" = Distorsio decussata Valenciennes 1832 snail
 Sorbeoconcha - Tonnidae
Malea ringens Swainson 1822 tun shell
 Sorbeoconcha - Cassidae
 Sorbeoconcha - Bursidae
"Bursa nana" = Marsupina nana
"Bursa nana" = Marsupina nana Broderip and Sowerby 1829 frog shell
 Sorbeoconcha - Cypraeidae
"Cypraea cayapa n. sp." = Muracypraea cayapa
"Cypraea cayapa n. sp." = Muracypraea cayapa Pilsbry and Olsson 1941 cowry
 Sorbeoconcha - Naticidae
Polinices rapulum moon snail
Natica broderipana moon snail
Natica marochiensis Gmelin 1791 moon snail
 Heterostropha - Architectonicidae
"Architectonica nobilis" = Architectonica nobilis, "Architectonica sexlinearis" = Architectonica nobilis
"Architectonica nobilis" = Architectonica nobilis Röding 1798 sundial
"Architectonica sexlinearis" = Architectonica nobilis Röding 1798 sundial
Bivalvia
 Arcida - Noetiidae
Noetia reversa Sowerby 1833 clam
Subspecies: Noetia reversa peruviana; new subspecies
 Arcida - Arcidae
"Arca (Cunearca) aequitorialis" = Anadara (Cunearca), "Arca (Cunearca) zorritoensis" = Anadara (Cunearca) zorritoensis, "Arca (Argina) brevifrons" = Lunarca brevifrons, "Arca (Scapharca) obesa" = Anadara obesa
"Arca (Cunearca) aequitorialis" = Anadara (Cunearca) ark
"Arca (Cunearca) zorritoensis" = Anadara (Cunearca) zorritoensis Spieker 1922 ark
[entered as Arca (Cunearca) zorritensis]
"Arca (Argina) brevifrons" = Lunarca brevifrons Sowerby I 1833 ark
"Arca (Scapharca) obesa" = Anadara obesa Sowerby 1833 ark
 Pectinida - Anomiidae
Anomia peruviana d'Orbigny 1846 jingle
Placunanomia cumingii Broderip 1832 scallop
[entered as Placunanomia cumingi]
 Pectinida - Pectinoidae
 Ostreida - Ostreidae
"Ostrea megodon" = Undulostrea megodon
"Ostrea megodon" = Undulostrea megodon Hanley 1846 oyster
 Pholadida - Corbulidae
"Corbula ovulata" = Caryocorbula ovulata
"Corbula ovulata" = Caryocorbula ovulata Sowerby 1835 clam
 Cardiida - Veneridae
Pitar salanga, Clementia (Egesta) solida, Cyclinella galera n. sp., "Chione (Lirophora) gorgona n. sp." = Lirophora mariae, Chione (Chionopsis) jamaniana n. sp., "Anomalocardia callistoides n. sp." = Iliochione callistoides
Pitar salanga Pilsbry and Olsson 1941 venus clam
Cyclinella galera n. sp. Pilsbry and Olsson 1941 venus clam
"Chione (Lirophora) gorgona n. sp." = Lirophora mariae d'Orbigny 1846 venus clam
Chione (Chionopsis) jamaniana n. sp. Pilsbry and Olsson 1941 venus clam
"Anomalocardia callistoides n. sp." = Iliochione callistoides Pilsbry and Olsson 1941 venus clam
 Cardiida - Mactridae
"Mactra (Micromactra) atacama n. sp." = Mactrotoma angusta, Harvella elegans, "Mactra (Mactrella) alata" = Mactrellona alata
"Mactra (Micromactra) atacama n. sp." = Mactrotoma angusta Reeve 1854 surfclam
Harvella elegans Sowerby 1825 clam
Subspecies: Harvella elegans tucilla
"Mactra (Mactrella) alata" = Mactrellona alata Spengler 1802 clam
 Cardiida - Anatinellidae
"Labiosa undulata" = Raeta undulata
"Labiosa undulata" = Raeta undulata Gould 1851 clam
 Cardiida - Cardiidae
"Cardium (Trigoniocardia) spiekeri" = Apiocardia spiekeri, Cardium (Trachycardium) ballenium n. sp., "Laevicardium pedernalense n. sp." = Laevicardium substriatum
"Cardium (Trigoniocardia) spiekeri" = Apiocardia spiekeri Hanna and Israelsky 1925 cockle
Cardium (Trachycardium) ballenium n. sp. Pilsbry and Olsson 1941 cockle
"Laevicardium pedernalense n. sp." = Laevicardium substriatum Conrad 1837 cockle
 Cardiida - Solecurtidae
Solecurtus broggii Pilsbry and Olsson 1941 clam
 Cardiida - Tellinidae
Tellina (Eurytellina) prora Hanley 1844 tellin clam
Tellina (Macaliopsis) aequizonata n. sp. Pilsbry and Olsson 1941 tellin clam
Macoma plebeia tellin clam
 Cardiida - Semelidae
Semele laevis Sowerby 1833 clam
 Carditida - Crassatellidae
"Eucrassatella gibbosa" = Hybolophus gibbosus
"Eucrassatella gibbosa" = Hybolophus gibbosus Sowerby 1832 clam
Subspecies: Eucrassatella gibbosa tucilla