Hittade 1 avhandling innehållade ordet Arenig-Llanvirn.
1. The flux of extraterrestrial matter to Earth as recorded in Paleogene and Middle Ordovician marine sediments
Sammanfattning : This thesis aims at reconstructing events in the solar system, mainly collisional events in the asteroid belt, by searches for extraterrestrial minerals in Paleogene and Middle Ordovician marine sediments on Earth. Recent empirical evidence show that Earth has experienced a few brief periods during the Phanerozoic when the flux of extraterrestrial matter significantly increased. LÄS MER