Phillipsastreid Corals from the Frasnian (Upper Devonian) of Western Canada: Taxonomy and Biostratigraphic Significance. Ross A. McLean, 2005. National Research Council Press, Ottawa, Ontario, Canada, 109 p., pb, ISBN 0-660-19364-7.
The Phillipsastreidae is a very important family of rugose corals that lived from middle Early Devonian time through the middle Late Devonian (Frasnian) in most parts of the world. Interestingly, they seem to have found their way into North America only during the Frasnian, presumably by way of what is now the Canadian Arctic from some part of Eurasia where phillipsastreids had long existed.