Ordovician reefs were also home to large sea ... they collected food particles with feathery arms that waved in the ocean currents. The hard-bodied arthropods started eyeing opportunities on ...

However, in the Ordovician, the creatures were invertebrates, or organisms lacking a backbone, such as brachiopods, trilobites, and corals. These organisms were perfectly suited to survive in the warm ...

Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00-818, Warszawa, Poland. Faculty of Biology, Institute of Evolutionary Biology, Biological and Chemical Research Centre, ...

Scientists studying the geology of the Ordovician Period about 466 million years ago report evidence that Earth's ring system created a telltale pattern of impact craters, and it may also explain ...

The theory would explain the presence of an odd density of impact craters around the equator dating back to the Ordovician period ... and a whole lot of ocean. But Earth has looked a lot of ...