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The Ordovician in Utah, US

Ordovician in Utah map

undifferentiated rock units help

Generalized geologic map from the Utah Geological Survey.

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Ordovician Fossils
Fossil photos from Ordovician in Utah

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Paleontology and geology

Ordovician rocks occur only in the western half of the state. The oldest of these consist of shelly sandstones representing a broad, ancient tidal flat. Shifting shorelines during the Middle Ordovician left behind thick layers of sandstones. By the Late Ordovician, warm, shallow seas returned to Utah and deposited limy sediments on the sea floor. Utah is rich in Ordovician fossils including trilobites, brachiopods, cephalopods, conodonts, graptolites, echinoderms, sponges, and algae.

Although this map only indicates the presence of undifferentiated rocks, there are scattered outcrops of Ordovician rocks throughout the western part of the state, as shown on the map provided by the Utah Geological Survey.

Links to more on the Ordovician in Utah



Courses and Lectures (showing 1 of 1 listings)

Paleogeography of the Southwestern U.S.: The paleogeography of the southwestern U.S. from 1.8 billion years ago to 10 million years ago. Text and images by Dr. Ron Blakey from Northern Arizona University.

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Field Guides (showing 1 of 1 listings)

Fossil Cephalopods in Utah: A reference to help provide information on the identity, biostratigraphy and location of fossil cephalopods found in the state of Utah.

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