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369 results on '"Martini, Rossana"'

17. Clypeina? pamelareidae n. sp., a new dasycladalean alga from the Upper Triassic of Lime Peak (Yukon, Canada).

Author

Bucur, Ioan I., Del Piero, Nicolò, and Martini, Rossana

Subjects
CORALLINE algae, STORM surges, MESOZOIC Era, CENOZOIC Era, CALCIFICATION
Abstract

A new calcareous alga is described from the Norian limestones of Lime Peak, Yukon, Canada. The algae-bearing limestoneswere formed in a low-energy environment below the storm wave base, as indicated by the abundance of carbonate mud. Clypeina? pamelareidae n. sp. usually appears in the form of separate laterals scattered in the sediment. The laterals are pyriform, with the tip slightly curved upwards. Sometimes they are arranged around a non-calcified axial cavity. The lack of calcification of the connection between themain axis and the laterals led to the detachment and scattering of the latter in the sediment. The shape of the laterals and their arrangement are reminiscent of the genus Clypeina (Michelin). Still, the lack of completely preserved specimens leads us to attribute itwith uncertainty to this genus. Almost certainly, the alga in question is individualised as a new distinct species, basically different from other Mesozoic or Cenozoic species of the genus, as well as from the only species of Clypeina known from the Triassic (Clypeina besici Pantić). [ABSTRACT FROM AUTHOR]

Published
2024
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35. Taanella yukonensis n. gen. n. sp., a uniquely perforate agglutinated foraminifer from the upper triassic of Panthalassa (Lime Peak, Yukon, Canada)

Author

Del Piero, Nicolo, Rigaud, Sylvain, and Martini, Rossana

Subjects
ddc:550
Abstract

This paper describes the new calc-cemented, agglutinated Panthalassan species Taanella yukonensis n. gen. n. sp. from the upper Norian of Lime Peak, Yukon, Canada. The species, morphologically close to a Triassic “trochamminid”, possesses unusually coarse wall perforations. This attribute is unknown from coeval agglutinated forms, which typically display imperforate or poorly perforate walls (i.e., loose agglutinated tests with gaps between particles). In the Late Triassic, remarkably large pores started to develop in a variety of foraminifers, including porcelaneous forms. This evolutionary tendency might indicate a heightened need to promote gas-exchange with the exterior. In T. yukonensis, this evolution is complemented with the development of externally globular chambers, separated by deep sutural slits, maximizing the surface ratio to the exterior.

Published
2022

47. Delving deep into the Panthalassa Ocean

Author

Martini, Rossana

Subjects
Micropaleontology, Foraminifers, Upper Triassic, Conodonts, ddc:550, Biostratigraphy, Halobiids, Sedimentology, Panthalassa
Abstract

The Triassic period started more than 250 million years ago and spanned over 50 million years. We spoke to Professor Rossana Martini about her work in studying marine shallow-water (reefal) limestone from this period, and the importance of this research to understanding the biological and ecological changes that occurred during the Triassic.

Published
2021

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