GSSP for Thanetian Stage
Definition:The base of the Thanetian Stage is defined in the sea-cliff along the main beach of the coastal town Zumaia, Basque Country, northern Spain. The GSSP is about 78m above the Cretaceous/Paleogene boundary. The GSSP is defined at a level 2.8m or eight precession cycles above the base of the core of the distinct clay-rich interval associated with the Mid-Paleocene Biotic Event, and it corresponds to the base of magnetochron C26n.
Sedimentology:The lower part of the Itzurun Formation can be subdivided into a lower, ca. 24m thick Member A and an upper, 52m thick Member B. The boundary between the two members is 6.5m below the GSSP. The turbidite intercalations of the marly Member A are mostly siliciclastic, whereas in Member B, they are siliciclastic or mixed carbonatic-siliciclastic. About 3 m above the limit between Member A and B of the Itzurun Formation is a prominent dark, ca. 1m thick interval recording a drastic decrease in CaCO3. This clay is interpreted as the Mid-Paleocene Biotic Event
Primary Markers:The Thanetian GSSP corresponds to the base of magnetochron C26n.
Correlation Events:Magnetic -- Base of Chron C26n
Notes on Derivation of Age:Astronomical cycles in sediments scaled from base Paleocene, using base of magnetic polarity chronozone C26n. Arbitrary 0.1 (2 precession cycles, plus the base-Paleogene radiometric) uncertainty assigned to all estimates.
Schmitz, B., Pujalte, V., Molina, E., Monechi, S., Orue-Etxebarria, X., Speijer, R.P., Alegret, L., Apellaniz, E., Arenillas, I., Aubry, M-P., Baceta, J.I., Berggren, W.A., Bernaola, G., Caballero, F., Clemmensen, A., Dinarès-Turell, J., Dupuis, C., Heilmann-Clausen, C., Hilario Orús, A., Knox, R., Martín-Rubio, M., Ortiz, S., Payros, A., Petrizzo M.R., von Salis, K., Sprong, J., Steurbaut, E., & Thomsen, E., 2011. The Global Stratotype Sections and Points for the bases of the Selandian (Middle Paleocene) and Thanetian (Upper Paleocene) stages at Zumaia Spain. Episodes 34/4, p. 220-243.
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