XI. PROTEROZOIC EON, 2.5 bya - 544 mya

Acritarchs, pollen, and other ancient microscopic fossils

XII. CAMBRIAN PERIOD, 544 - 505 mya

XIII. ORDOVICIAN PERIOD, 505 - 440 mya

XIV. SILURIAN PERIOD, 440 mya - 410 mya

XV. DEVONIAN PERIOD, 410 - 360 mya

XVI. CARBONIFEROUS PERIOD, 360 - 286 mya

XVII. PERMIAN PERIOD, 286 - 245 mya

XVIII. TRIASSIC PERIOD, 245 mya - 208 mya

XIX. JURASSIC PERIOD, 208 - 146 mya

Old translated papers in paleontology

XX. CRETACEOUS PERIOD, 146 mya - 65 mya

Origin of birds. Now, they're worldwide

  Victorian letters by Harlan Wallach © 1994

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