Sökning: "Martin Qvarnström"

Hittade 2 uppsatser innehållade orden Martin Qvarnström.

1. 1. Palaeoenvironments of the Earliest (Middle Devonian) Tetrapod Trackways from the Holy Cross Mountains, Poland; Locomotion in a Terrestrial Setting?

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Martin Qvarnström; [2015]
   Nyckelord :Tetrapods; palaeoenvironment; trackways; paleosols; microfacies; trace fossils; fin-limb transition; Holy Cross Mountains.;

   Sammanfattning : The palaeoenvironment from which early tetrapods emerged is crucial to comprehend in order to understand the mechanisms that drove and allowed the terrestrialization of vertebrates; one of the most important evolutionary ‘events’ in the history of animals. Nevertheless, much of the terrestrialization is shrouded in obscurity, inter alia, due to scarcity of early tetrapods in the fossil record. LÄS MER

3. 2. An interpretation of oncoid mass-occurrence during the Late Silurian Lau Event, Gotland, Sweden

   Kandidat-uppsats, Lunds universitet/Geologiska institutionen

   Författare :Martin Qvarnström; [2012]
   Nyckelord :Bjärsjölagård; Gotland; microbialites; Silurian; Oncoids; Lau Event; ecological crisis; Onkoider; Silur; microbialiter; ekologisk kris; Earth and Environmental Sciences;

   Sammanfattning : The geological significance of the microbial-formed oncoid is not as well understood as the recognized, analogous stromatolite but can, as well be used as an environmental indicator. In association with the larger Phanerozoic mass extinctions, a resurgence of microbialites as a disaster fauna is at present an accepted view. LÄS MER