A Triceratops skeleton from eastern Wyoming.

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Field mapping of the skeleton of the Tyrannosaurus rex ‘Thomas’ (southeastern Montana).

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Duck-billed dinosaur remains from eastern Wyoming.

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The fossil-rich exposures of the Hell Creek Formation of Montana.

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Quarry of the Tyrannosaurus rex ‘Thomas’ (southeastern Montana).

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Southeastern Montana, with exposures in the background.

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Lunch break at the quarry of the Tyrannosaurus rex ‘Thomas’ (southeastern Montana).

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Plaster jackets containing the bones of Triceratops (eastern Wyoming).

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