Sökning: "Sebastian Willman"

Hittade 5 avhandlingar innehållade orden Sebastian Willman.

  1. 1. Life in the Ediacaran - A study of organic walled microfossils from Australia

    Författare :Sebastian Willman; Uppsala universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  3. 2. The Ediacaran Diversification of Organic-walled Microbiota : Ocean Life 600 Million Years Ago

    Författare :Sebastian Willman; Małgorzata Moczydłowska-Vidal; John Peel; Shuhai Xiao; Uppsala universitet; []
    Nyckelord :Earth sciences; acritarchs; Ediacaran; Australia; biostratigraphy; microfossils; Geovetenskap;

    Sammanfattning : The only direct evidence of past life is provided by fossils. Fossils tell us about the evolution of life on Earth and they give us clues concerning ancient environments. The Ediacaran Period (roughly 635-542 million years ago) is characterised by the appearance and diversification of various microbiota and also the diversification of metazoans. LÄS MER

  4. 3. Microfossils of eukaryotic cysts through time : A study of Precambrian-Ordovician organic-walled microbiota

    Författare :Heda Agić; Malgorzata Moczydlowska; Sebastian Willman; Frances Westall; Nicholas Butterfield; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; microfossils; eukaryotes; Proterozoic; reproductive cyst; Earth Science with specialization in Historical Geology and Palaeontology; Geovetenskap med inriktning mot historisk geologi och paleontologi;

    Sammanfattning : .... LÄS MER

  5. 4. Untangling ambiguities in the microbial fossil record : experimental abiotic and biological approaches

    Författare :Sigrid Huld; Anna Neubeck; Sebastian Willman; Sean McMahon; Barbara Cavalazzi; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; chemical gardens; pseudofossils; experimental mineralisation; microbial fossils; methanogens;

    Sammanfattning : Life on early earth has long been the topic of discussion for many researchers: how did it come to be? Which cells came first? Where can we find them? The most ancient rocks on our planet may hold some of the answers to these questions, but many may only be answered in laboratories. Chemical and morphological traces can be found from Archaean deposits, tantalisingly similar to modern day prokaryotes. LÄS MER

  7. 5. Unlocking the hidden diversity of organic-walled microfossils from the early Cambrian of North Greenland

    Författare :Elise Wallet; Sebastian Willman; Ben Slater; Graham Budd; Charles H. Wellman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Cambrian; acritarchs; organic-walled microfossils; small carbonaceous fossils; Greenland; diversity; disparity; taxonomy; taphonomy; Crustacea; plankton; Historical Geology and Paleontology; Historisk geologi och paleontologi;

    Sammanfattning : The early Cambrian Buen Formation of North Greenland is celebrated for hosting one of the oldest Cambrian Burgess Shale-type deposits known to date – the Sirius Passet Lagerstätte. Further south in a shallower shelf facies belt, the Buen Formation yielded organic-walled microfossils (OWMs) that were originally described with a focus on acritarchs. LÄS MER