375 First amphibians, the oldest evidence of land vertebrates. 370 First sharks. Sharks and bony fish called arthrodires were common in Devonian seas. These looked like ferns. 360 Mississippian Period 360 Crinoids and colonial corals are common fossils.
Starfish also occur.
330 First possible evidence of fossil reptiles. Also, oldest fossil evidence of conifers, seed-bearing plants with cones. 320 Pennsylvanian Period 320 Broad swamps were common, somewhat similar to the Everglades today. Common fossils include plant fossils like ferns. This is when most of eastern United States bituminous coal was formed.