Portal:Paleozoic
The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon, spanning from roughly 541 to 252.17 million years ago. It is the longest of the Phanerozoic eras, and is subdivided into six geologic periods (from oldest to youngest): the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The Paleozoic comes after the Neoproterozoic Era of the Proterozoic Eon, and is followed by the Mesozoic Era.
Cambrian edit
Ordovician edit
- "Description of a New Species of Trilobite", 1875 by Charles Doolittle Walcott.
- "Notes on Ceraurus pleurexanthemus, Green", 1875 by Charles Doolittle Walcott.
- "New Species of Trilobite from the Trenton Limestone at Trenton Falls, N. Y.", 1875 by Charles Doolittle Walcott.
- Notice of the discovery of a Poecilopod in the Utica slate formation, 1882 by Charles Doolittle Walcott.
- Description of a New Genus of the Order Eurypterida from the Utica Slate, 1882 by Charles Doolittle Walcott