1BATT R J. Ammonite shell morphotype distribution in the Western Interior Greehorn sea and some paleoecological implication[J]. Palaios, 1989, 4: 32-42.
2WRIGHT C W, CALLOMON J H, HOWARTH M K. Treatise on Invertebrate Paleontology, part L, Mollusca 4 (revised),Cretaceous Ammonoidea. The Geological society of Americ, Inc. and the Uniersity of Kansas, Boulder, Colorado and Lawrence, Kansas, 1996:362.
3LARSON N L. JORGENSEN S D. FARRAR R A. et al. Ammonites and the other cephalopods of the Pierre Seaway[M]. Tuscon Arizona: Geoscience Press lnc, 1997:148.
4BUCHER H. KLOFAK S M. GUEX J. Mode and rate of growth in ammonoids[G]// LANDMAN N H, TANABE K. DAVIS R A. Ammonoid Paleobiology. New York: Plenum Press, 1996 : 408-463.
5WESTERMANN G E G. Ammonid life and habitat [G]// LANDMAN N H, TANABE K. DAVIS R A. Ammonoid Paleobiology. New York: Plenum Press, 1996 : 608-710.
6TSUJITA C J. WESTERMANN G E G. Ammonoid habitats and habits in the Western Interior Seaway: a case study from the Upper Cretaceous Bearpaw Formation of southern Alberta [J]. Palaeogeography Palaeoclimatology Palaeoecology, 1998, 144(26) : 135-160.
7RYOJI W. The peculiar taphonomy of the streamlined late Campanian ammonite Metaplacentieeras subtilistriatum from northern Hokkaidv[J]. Cretaceous Research Volume, 2006,27 (6):863-871.
8MAEDA K. SEILACHER A. Ammonoid taphonomy[G]// LANDMAN N H, TANABE K. DAVIS R A. Ammonoid Paleobiology. New York: Plenum Press, 1996:544-580.
