Where: Tumbes, Peru (3.7° S, 80.7° W: paleocoordinates 4.9° S, 76.4° W)
• coordinate based on nearby landmark
• local area-level geographic resolution
When: Lower Member (Zorritos Formation), Early/Lower Miocene (23.0 - 16.0 Ma)
• Stated as Early Miocene by Spieker (1922) and corroborated by more recent publications (e.g. see Higley 2004). Overlies the late Oligocene-early Miocene Heath Fm and underlies the Cardalitos Fm in Higley (2004) although Spieker (1922) uses varying lithostratigraphic nomenclature suggesting a "Talara Fm" overlies the upper member of the Zorritos Fm. Its is not clear whether definitions of these members has changed since Spieker. The lower member of the Zorritos Fm is 245 ft thick and comprises sandstone with interbedded shales.
• member-level stratigraphic resolution
Environment/lithology: coastal; poorly lithified, shelly/skeletal, yellow, argillaceous, conglomeratic, calcareous sandstone and poorly lithified, gray, yellow, argillaceous, calcareous, carbonaceous sandstone
Size class: macrofossils
Reposited in the YPM
• Collected by J. Singewald, and with inspection of collections by E.T. Nelson (1870) at Yale University. Possibly also involved inspection of Grzybowski's material (Geol. Inst. of Cracow). Singewald's material is presumably reposited at Johns Hopkins.
Primary reference: E. M. Spieker. 1922. The Paleontology of the Zorritos Formation of the North Peruvian Oil Fields. The Johns Hopkins University Studies in Geology 3:1-196 [A. Miller/A. Hendy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 59001: authorized by Austin Hendy, entered by Austin Hendy on 05.03.2006
Creative Commons license: CC BY (attribution)