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: Progreso Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• From Progresso Fm, which is of Middle Miocene age, overylies the Subibaja Fm (lower Early Miocene). The thickness of the formation is about 200 ft throughout its outcrop area. It is regionally correlated with the Variegated, Upper Zorritos, Cardalitos (Peru) and Onzole and Borbón (Ecuador) formations.
• bed-level stratigraphic resolution
Environment/lithology: coastal; poorly lithified, pebbly, tuffaceous, green, argillaceous, silty, conglomeratic, calcareous sandstone
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 61053: authorized by Austin Hendy, entered by Austin Hendy on 29.05.2006
Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)