It is divided into seven stages, based on the remains of invertebrate fossils such as crinoids, ammonoids, and brachiopods.
It is divided into seven stages, based on the remains of invertebrate fossils such as crinoids, ammonoids, and brachiopods. Named in 1839 by Murchison and Sedgwick, graptolites went extinct in this period, which also saw the decline of trilobites and the formation of large continental deposits of red silt and sandstone. FTP, identify this geological period of the Paleozoic era, which began about 395 million years ago and which came between the Silurian and Carboniferous periods.
It is divided into seven stages, based on the remains of invertebrate fossils such as crinoids, ammonoids, and brachiopods.
the {Devonian} period