The  earliest land plants, the psilopsids, and the first land animals,  archaic scorpions, developed.
In this geologic period, marine invertebrates continue to  prosper much as they did in Ordovician times, and fragmentary  remains of jawless fishes increase in coastal deposits. The  earliest land plants, the psilopsids, and the first land animals,  archaic scorpions, developed. FTP, name this period lasting from  430 to 395 million years ago, the third oldest division in the  Paleozoic era.
In this geologic period, marine invertebrates continue to  prosper much as they did in Ordovician times, and fragmentary  remains of jawless fishes increase in coastal deposits.
{Silurian} Period