|Class Q - Science
Subclass E - Geology
|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.— Excerpted from Paleozoic on Wikipedia, the free encyclopedia.The Paleozoic (or Palaeozoic) Era is the earliest of three|
- "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
- Carboniferous Eurypterids of Nebraska, 1914 by Erwin Hinckly Barbour
- Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: Eurypterida, 1963 by Erik Norman Kjellesvig-Waering.