Where: Guayas, Ecuador (1.7° S, 80.3° W: paleocoordinates 2.5° S, 77.3° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Blue Siltstone Member (Daule Formation), Middle Miocene (16.0 - 11.6 Ma)
• From uppermost part of blue siltstone mbr, Daule Fm, which is of Middle Miocene age comprises three members, a "basal calcareous" member, a middle "blue siltstone" member, and an "upper calcareous" member. The exact thickness of the unit has not been measured accurately in this section because of structural complications. The blue siltstone, from which this collecion is derived is about 800 ft thick. Faunal compositions suggests a Middle Miocene age, with affinities to the Progreso Fm, and Middle Miocene formations of Peru. Taxa are share with the Gatun fm, the Tubera Fm, the Cucurrupi Fm of Colombia.
• bed-level stratigraphic resolution
Environment/lithology: offshore; poorly lithified, blue siltstone
Size class: macrofossils
Reposited in the PRI
Collection methods: quarrying,
• 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 61090: authorized by Austin Hendy, entered by Austin Hendy on 29.05.2006
Creative Commons license: CC BY (attribution)
Taxonomic list
Bivalvia | |
Cavilucina thalmani clam | |
Pitar multifilosus venus clam | |
Gastropoda | |
Calliostoma grabaui Maury 1917 top snail | |
Architectonica corusca, Architectonica haughti, "Architectonica sexlinearis" = Architectonica nobilis
Architectonica corusca sundial
Architectonica haughti sundial
"Architectonica sexlinearis" = Architectonica nobilis Röding 1798 sundial | |
"Turritella altilira" = Turritella (Bactrospira) altilira
"Turritella altilira" = Turritella (Bactrospira) altilira Conrad 1857 turret shell | |
"Natica guppyana" = Stigmaulax guppiana
"Natica guppyana" = Stigmaulax guppiana Toula 1909 moon snail | |
"Tritiaria mexicana" = Antillophos (Antillophos) mexicanus
"Tritiaria mexicana" = Antillophos (Antillophos) mexicanus Bose 1906 true whelk | |
"Conus multiliratus" = Conasprelloides multiliratus
"Conus multiliratus" = Conasprelloides multiliratus Olsson 1922 cone shell |