graptolites

They date back to the Lower or Middle Cambrian and include an important class of fossils called graptolites, most of which became extinct in the Carboniferous. condividi - cerca i tuoi siti preferiti -

Ultimi bookmark postati su Segnalo 2009

Among the most remarkable of the tiny fossilized creatures Mr. Zalasiewicz excises from the stone are graptolites — an entirely extinct variety of oceanic drifters that formed intricate, communal chains.

Rock of Ages Brian Switek 2011

The Permian extinction, 244 million years ago, devastated the marine biota: tabulate and rugose corals, blastoid echinoderms, graptolites, and most crinoids died out, as did the last of the trilobites.

Paleozoic 2009

Later Paleozoic seas were dominated by crinoid and blastoid echinoderms, articulate brachiopods, graptolites, and tabulate and rugose corals.

Paleozoic 2009

The foundries and factories had been working at full capacity for years, manufacturing exquisitely detailed ammonites, graptolites and molluscs by the million.

Here is the Weather Forecast Zoe Brain 2007

The foundries and factories had been working at full capacity for years, manufacturing exquisitely detailed ammonites, graptolites and molluscs by the million.

Archive 2007-04-01 Zoe Brain 2007

The presence of Trilobites (species Triarthrus) and graptolites indicate that this ecosystem existed in the Upper Permian, 213 million years ago.

Archive 2004-03-01 Andrew 2004

The presence of Trilobites (species Triarthrus) and graptolites indicate that this ecosystem existed in the Upper Permian, 213 million years ago.

worlds in a grain of sand Andrew 2004

Trilobites, ammonites, crinoids, graptolites and brachiopods are among some of the fossils that can be found in this area.

Archive 2004-03-01 Andrew 2004

Trilobites, ammonites, crinoids, graptolites and brachiopods are among some of the fossils that can be found in this area.

worlds in a grain of sand Andrew 2004