Disputation: Hanna Rosa Hjalmarsdottir

Doctorial Candidate Hanna Rosa Hjalmarsdottir  at the Natural History Museum will be defending the thesis "New insight into the Taxonomy, Biostratigraphy, and Paleoecology of Jurassic – Cretaceous Arctic foraminifera." for the degree of Philosophiae Doctor.

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The PhD defence will be fully digital and streamed directly using Zoom. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.

Ex auditorio questions: the chair of the defence will invite the audience to ask ex auditorio questions either written or oral. This can be requested by clicking 'Participants -> Raise hand'. 

  • Research findings

  • Microfossils from the Circum-Arctic

    If you ever find yourself on a white sandy beach, take a small sample and look at it under a microscope. If you are lucky, you could discover microfossils called foraminifera. There are commonly hundreds and sometimes thousands of foraminifera in each sample, divided into tens of genera and species. The numerous specimens enable the researcher to perform various statistical tests which can provide information that larger and less abundant fossils cannot.

  • Fossil foraminifera are useful in biostratigraphy, palaeoecology, palaeobiogeography, in addition to oil exploration which developed as early as towards the end of the 19th century. The interest in foraminifera applications intensified after the middle of last century because of growing hydrocarbon exploration, requiring more insight into the stratigraphy and palaeoenvironments of sedimentary basins all over the world."

  • The thesis focuses on the Circum-Arctic, a part of the world under-researched for foraminifera. Six new beautifully preserved species from the Jurassic to Cretaceous Slottsmøya Member in Svalbard have been described, and the first foraminiferal study on the Early Cretaceous Carolinefjellet Formation in Svalbard is presented.

    The state-of-the-art research in the thesis therefore provides an important link in information between the basins of Siberia and the North American Arctic.

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  • Labrospira lenticulata, an excellently preserved specimen and a new species of foraminifera, from the palaeoseeps of the Slottsmøya Member in Svalbard.


  • Contact: Elisabeth AronsenOrganizer: Natural History Museum


Natural History Museum
Published Mar. 15, 2021 7:16 AM - Last modified Apr. 9, 2022 1:11 PM