Abstract
The Varignano section (Trento Province, northern Italy): a chance to correlate shallow benthic zones and calcareous plankton zones near the Bartonian–Priabonian boundary
Highlights
A unique chance for a direct correlation between the Shallow Benthic Zones (SBZ) and the calcareous plankton zones is provided by the Varignano section (Trento Province, northern Italy), which is 80 km west of Alano di Piave, deposited in a similar bathyal setting but with much more larger-foraminiferal bearing bioclastic levels
The ‘Tiziano bed’, a prominent lithological tuff layer whose base has been proposed for the base of the Priabonian (Agnini et al, 2011) is very close to different events, namely the Cribrocentrum erbae acme (Fornaciari et al, 2010; Agnini et al, 2011), the extinction of morozovellids and large acarininids (Agnini et al, 2011; Wade et al, 2012), and the base of magnetochron C17n.1n (Vandenberghe et al, 2012)
At Alano di Piave there is no way to directly correlate any of these events with the larger foraminifera shallow-water biozones, namely the Shallow Benthic Zones (SBZ) of Serra-Kiel et al (1998)
Summary
A unique chance for a direct correlation between the SBZ and the calcareous plankton zones is provided by the Varignano section (Trento Province, northern Italy), which is 80 km west of Alano di Piave, deposited in a similar bathyal setting but with much more larger-foraminiferal bearing bioclastic levels (eleven sampled). The GSSP for the base of the Priabonian stage has not yet been defined, but a candidate section has been recently proposed by Agnini et al (2011) near Alano di Piave (Veneto region, northern Italy), some 50 km far from the historical stage stratotype of Priabona.
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