This is a preview. Log in through your library . Abstract Populations of colonial organisms offer the possibility of partitioning their morphologic variability into within-colony and among-colony ...

The newly identified fossil is significant because it provides a long-sought morphological link between the earliest known lungfish, Diabolepis speratus -- also found in South China -- and later, more ...

Conodonts referable to 7 identifiable species distributed among 10 conodont genera, are reported from bone bed accumulations in the Middle Devonian Columbus and Delaware limestones of central and west ...

Safe distance: supernova SN 1987A as seen by the ESO Schmidt Telescope. Located 168,000 light-years away, this object posed no danger to Earth. (Courtesy: ESO) The explosion of a nearby star could ...

Scientists who famously discovered the lobe-finned fish fossil Tiktaalik roseae, a species with some of the clearest evidence of the evolutionary transition from fish to limbed animals, have described ...

A long, long time ago — between 378 million and 375 million years ago — about half of all species on the planet vanished. The trigger for this mass extinction, one of five known in Earth's history, ...

We think of mass extinctions as brief moments of havoc — profoundly devastating but over within a geologic instant. The Devonian, the second of the so-called "Big Five,” defies this notion. If the ...

Archaeologists uncovered the ancient creature while studying sandstone deposits in a section of road in north central Pennsylvania. It is believed to be from the late Devonian period, at a time long ...