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Geologic Map
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief


  The North American Tapestry of Time and Terrain

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Legend and Rock Ages
Rock Types
Political Boundaries

  Legend and Rock Ages

Tertiary Rocks - 65 to 1.8 million years ago

map of tertiary rocks


The epochs that compose the Tertiary can be further divided into the Paleogene and the Neogene. The Paleogene covers the three oldest epochs: the Paleocene, Eocene, and Oligocene. The Neogene can include the Miocene, Pliocene, Pleistocene, and Holocene, but we have put the Pleistocen and Holocene into the Quaternary. Essentially, on this map the Paleogene represents the late Tertiary; the Neogene covers the early Tertiary.