203 research outputs found
REASSESSMENT OF THE EARLY-MIDDLE EOCENE PLANKTIC FORAMINIFERAL BIOMAGNETOCHRONOLOGY: NEW EVIDENCE FROM THE TETHYAN POSSAGNO SECTION (NE ITALY) AND WESTERN NORTH ATLANTIC OCEAN ODP SITE 1051
No full textWe examined a planktic foraminiferal biostratigraphic
record from the Tethyan Possagno section (Venetian Prealps
of northeastern Italy) spanning the lower–middle Eocene
transition, from Chron C24r to the base of Chron C20r and
from Zones E1 to lower E8. Our results provide an updated
magnetochronological calibration from the Tethyan realm of
the lowest and highest occurrences of the zonal markers. All
the foraminiferal biostratigraphic events utilized in the most
recent and widely used zonal schemes have been recognized.
Most of them are in reasonable agreement with the known
magnetochronological calibration, such as those at the
Paleocene/Eocene boundary and lowermost Eocene. However,
a number of events, specifically the bases of Morozovella
aragonensis, Acarinina cuneicamerata, and Guembelitrioides
nuttalli, occur at a significantly lower position at Possagno
than in the most recent zonal schemes. A comparable
magnetostratigraphic position has been recorded for the first
two bioevents in the western North Atlantic Ocean ODP Site
1051 (Blake Nose, Atlantic Ocean). Furthermore, the base of
A. cuneicamerata and the top of Morozovella subbotinae
occur in reverse order with respect to previous schemes, thus
negating the effectiveness of Zone E6 as now used. We
propose an alternative definition of the Zone E6/E7a
boundary by substituting the base of Astrorotalia palmerae
for that of A. cuneicamerata. This proposal avoids combining
E6 and E7a into a single zone. Additionally, we recorded a
significantly different magnetostratigraphic position for the
base of Turborotalia frontosa, a critical event for the
Ypresian-Lutetian boundary placement.
Our biostratigraphic dataset is unique in the integration of
deep-benthic foraminiferal events with magnetostratigraphy
and calcareous plankton data. Because biostratigraphic data
of planktic foraminifera from the Possagno section derive
from the same sample set analyzed for calcareous nannofossils,
we were able to outline an integrated, updated,
calcareous plankton stratigraphy of the lower–basal middle
Eocene from a Tethyan location
7. The Pesciara-Monte Postale Fossil-Lagerstätte: 4. The “minor fauna” of the laminites
No full textNew insights on Anthracotherium monsvialense De Zigno, 1888 (Mammalia, Cetartiodactyla) from the lower Oligocene of Monteviale (Vicenza, northeastern Italy)
No full textIn Italy, anthracotheres are represented by a few fossils, most of them described during the XIX century and without a standardized scientific method. Anthracotherium monsvialense De Zigno, 1888 was originally
erected from a fossil discovered in the site of Monteviale (Vicenza, northeastern Italy), whose Rupelian (MP21) lignitic beds yielded the richest lower Oligocene evidence of the genus Anthracotherium in Europe. A. monsvialense ranges from MP21 to MP23 and its small size has been interpreted as a consequence of the insular environment, at least at Monteviale. In this study, we summarize the long history of Italian findings providing new descriptions of dental and postcranial morphological features of A. monsvialense, and comparing such small anthracothere with its Asian and European relatives. Morphometric analyses are also performed on teeth, in order to verify the presence of evolutionary trends of the genus Anthracotherium
Posadia feroniensis n. gen., n. sp. (Lituolida, Hormosinidae) from the Bathonian of Sardinia, Italy
No full text4. The Pesciara-Monte Postale Fossil-Lagerstatte: 1. Biostratigraphy, sedimentology and depositional model
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