TY - RPRT TI - Ichnofossils of the alluvial Willwood Formation (lower Eocene), Bighorn Basin, northwest Wyoming, U.S.A AU - T. M. Bown AU - M. J. Kraus PY - 1983 DO - 10.1016/0031-0182(83)90050-0 UR - https://pubs.usgs.gov/publication/70011195 ID - 70011195 ER -