Also known as Z-80
Where: Guayas, Ecuador (2.3° S, 80.4° W: paleocoordinates 3.5° S, 76.3° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: ZacachĂșan Member (Subibaja Formation), Early/Lower Miocene (23.0 - 16.0 Ma)
• From ZacachĂșan Mbr of Subibaja Fm, which is of upper Early Miocene age, overyling the Saiba Mbr (lower Early Miocene) and underlying the Middle Miocene Progresso Fm. The thickness of the formation is 1800 ft at its type section. Age is approximately equivalent to the Burdigalian stage based on correlation with other S. and C. American faunas. It is regionally correlated with the Lower Zorritos (Peru) and Angostura (Ecuador) formations.
• bed-level stratigraphic resolution
Environment/lithology: coastal; poorly lithified, fine-grained, glauconitic, micaceous, pyritic, sandy, carbonaceous siltstone
Size class: macrofossils
Reposited in the PRI
• Fossil material derived from the International Ecuadorian Petroleum Company (subsidiary of Standard Oil Co.) and was collected by the author (then employed by oil company) during field exploration and drilling operations. All type and voucher material reposited in PRI collections.
Primary reference: J. G. Marks. 1951. Miocene stratigraphy and paleontology of Southwestern Ecuador. Bulletins of American Paleontology 33(139):1-448 [A. Miller/A. Hendy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 60734: authorized by Austin Hendy, entered by Austin Hendy on 21.05.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Scaphopoda | |
"Cadulus (Gadila) sp." = Gadila
"Cadulus (Gadila) sp." = Gadila Gray 1847 tusk shell | |
Gastropoda | |
Teinostoma "sp. A" Adams and Adams 1853 snail | |
Anachis stevensoni Marks 1951 snail
Strombina prequenita snail | |
Terebra cf. zapotalensis auger snail | |
Compsodrillia sp. Woodring 1928 snail | |
Bivalvia | |
Nuculana subibajana pointed nut clam | |
Tellina "sp. A" Linnaeus 1758 tellin clam
Tellina "sp. B" Linnaeus 1758 tellin clam |