A hand sample showing the Anio Novus aqueduct ripple-marked travertine deposits in vertical cross-section. The sample is approximately 27 centimeters long. (IMAGE)

University of Illinois at Urbana-Champaign, News Bureau

A hand sample showing the Anio Novus aqueduct ripple-marked travertine deposits in vertical cross-section. The sample is approximately 27 centimeters long.

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A hand sample showing the Anio Novus aqueduct ripple-marked travertine deposits in vertical cross-section. The sample is approximately 27 centimeters long.

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Image courtesy Bruce Fouke

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