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  • Written in Chalk

    Written in Chalk

    Image of the Week

    The world’s chalk deposits are made of fossilized remains of the shells of tiny microscopic algae.

  • Earth Evolution—The Intersection of Geology and Biology

    Earth Evolution—The Intersection of Geology and Biology

    Poster

    A poster from the 2012 Holiday Lectures on Science, Changing Planet: Past, Present, Future. It illustrates how the Earth has evolved over the past 4.6 billion years, and highlights how that evolution influences biological evolution.

  • Stratigraphic Principles

    Stratigraphic Principles

    Clip

    (2 min 21 sec) Dr. John Shea demonstrates the two main principles in the study of rock layers: superposition and association.