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Repository of the Athabasca River Basin

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1987

Westrop, S. R., & Ludvigsen R. (1987). Biogeographic control of trilobite mass extinction at an Upper Cambrian "Biomere" boundary. 13(1), 84-99.

1986

Ludvigsen, R., & Westrop S. R. (1986). Classification of the Late Cambrian trilobite Idiomesus Raymond. 23, 300-307.

Westrop, S. R., & Ludvigsen R. (1986). Type species of the basal Ibexian trilobite Corbinia Walcott, 1924. 60(1), 68-75.

1983

Ludvigsen, R., & Westrop S. R. (1983). Trilobite biofacies of the Cambrian-Ordovician boundary interval in northern North America. 7(4), 301-319.

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