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Ware Vertebrates (Pliocene of Colombia)

Also known as STRI 470062

Where: La Guajira, Colombia (11.9° N, 71.3° W: paleocoordinates 11.7° N, 70.8° W)

• coordinate stated in text

When: Ware Formation, Late/Upper Pliocene (3.6 - 2.6 Ma)

• The marine invertebrate fauna of the Ware Formation shows a greater similarity with modern assemblages offshore of the Guajira Peninsula than with those of the underlying units. Few taxa provide finely resolved age constraints for the Ware Formation. Pectinids such as Amusium mortoni (early Pliocene to earliest Pleistocene), Euvola codercola (latest Miocene to Pliocene), and Nodipecten arnoldi (late Pliocene to early Pleistocene) suggest an age close to the Pliocene-Pleistocene boundary. A number of internal molds of a shell similar to Acrosterigma dalli (Heilprin, 1887) were also collected. Acrosterigma dalli is known only from the earliest Pleistocene of Florida, and is not easily confused with other cardiid bivalves. A mean age of 3.2 Ma (range of 3.40 Ma to 2.78 Ma) is calculated for the shell bed at the top of the formation from

•87 86 Sr/ Sr ratios. A late Pliocene (Piacenzian) age is assigned to the Ware Formation on the basis of macroinvertebrate biostratigraphy and 87Sr/86Sr isotope chronostratigraphy.

Environment/lithology: fluvial-deltaic; lithified, quartzose sandstone and lithified, muddy sandstone

• The base of the Ware Formation was deposited in a fluvio-deltaic environment, whereas the marine invertebrate assemblage at the top of the unit contains taxa typical of exposed open-ocean shoreface and nearshore settings, but with proximity to coral reef habitats.
• The formation is composed of greyish yellow fine lithic to quartz sandstone and muddy lithic to quartz sandstone, light grey mudstone, reddish grey pebbly conglomerate with sedimentary and metamorphic rock fragments, yellowish grey fossiliferous packstone, and sandy to conglomeratic beds with high fossil content. Lenticular conglomerates with sedimentary and metamorphic rock fragments, very rich in vertebrate fossils dominates the base of the sequence, they are interbedded with mudstone, sandy mudstone, and fossiliferous fine lithic to quartz sandstone with planar bedding (~7 m). Thick levels of fine lithic to quartz sandstone and sandy mudstone with cross- and planar bedding, and metric clinoforms compose the middle part of the sequence (~15 m). The uppermost horizon of the Ware comprises fossiliferous packstone with gravel-size fragments that vary laterally from packstone to sandy conglomerate (~3m).

Size class: macrofossils

Primary reference: J. F. Moreno, A. J. W. Hendy, L. Quiroz, N. Hoyos, D. S. Jones, V. Zapata, S. Zapata, G. A. Ballen, E. Cadena, A. L. Cardenas, J. D. Carrillo, J. D. Carrillo, D. Delgado-Sierra, J. Escobar, J. I. Martinez, C. Martinez, C. Montes, J. Moreno, N. Perez, R. Sanchez, C. Suarez and M. C. Valle. 2015. Revised stratigraphy of Neogene strata in the Cocinetas Basin, La Guajira, Colombia. Swiss Journal of Paleontology [C. Jaramillo/A. Cardenas /M. Vallejo] more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 166508: authorized by Carlos Jaramillo, entered by Andrés Cardenas on 16.02.2015, edited by Juan Carrillo

Creative Commons license: CC BY (attribution)