The Earth: a ringed planet, much like Saturn, surrounded by a hula hoop of asteroids. The summit of Mount Everest: a tropical ...

“Over millions of years, material from this ring gradually fell to Earth, creating the spike in meteorite impacts observed in ...

Found in rock samples retrieved in Australia more than 60 years ago, the microfossils dating to the Lower Ordovician Period ... the fossil spore record—the physical evidence of early plant life ...

A weird number of craters are located close to the equator, and the odds that this is random are incredibly low, researchers ...

Evolutionary history of mycorrhizal symbioses and global host plant diversity. New Phytologist ... plutonism and metamorphism in the Northern Tasmanides: extensional Cambro-Ordovician tectonism of the ...

Updated modelling of the potential starter pit area at Santa Barbara indicates that areas with higher-grade mineralization ...

They describe a great series of siliceous limestones, jaspers and claystones, with interstratified coral limestones and plant-beds ... both of Ordovician and Carboniferous ages, has been made ...

Let’s start with a clear definition of what constitutes a mass extinction. Unlike regular extinctions, which occur at a steady background rate — about 10% of species lost every million years — mass ...

This era of intense bombardment, known as the Ordovician impact spike, may have resulted from meteorites falling from the ring rather than flying in from space, which would explain the strange ...

with a steep rise occurring during the Ordovician period. Back then, the world would have looked much different than it does today. Sparse patches of green slime or moss-like species may have spread ...