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Index [Italic page numbers indicate major references] Abbott Formation, Illinois, 251 Michigan, 287 beetle borrows, Nebraska, 11 Acadian belt, 429 Archean rocks beetles, Manitoba, 45 Acadian orogeny Michigan, 273, 275 Belfast Member, Brassfield Illinois, 243 Minnesota, 47, 49, 53 Formation, Ohio, 420, 421 Indiana, 359 Wisconsin, 189 Bellepoint Member, Columbus Acrophyllum oneidaense, 287 Arikaree Group, Nebraska, 13, 14, Limestone, Ohio, 396 Adams County, Ohio, 420, 431 15, 25, 28 Belleview Valley, Missouri, 160 Adams County, Wisconsin, 183 Arikareean age, Nebraska, 3 Bellevue Limestone, Indiana, 366, Admire Group, Nebraska, 37 arthropods 367 Aglaspis, 83 Iowa, 83 Bennett Member, Red Eagle Ainsworth Table, Nebraska, 5 Missouri, 137 Formation, Nebraska, 37 Alexander County, Illinois, 247, 257 Ash Hollow Creek, Nebraska, 31 Benton County, Indiana, 344 algae Ash Hollow Formation, Nebraska, 1, Benzie County, Michigan, 303 Indian, 333 2, 5, 26, 29 Berea Sandstone, Ohio, 404, 405, Michigan, 282 Ash Hollow State Historical Park, 406, 427, 428 Missouri, 137 Nebraska, 29 Berne Conglomerate, Logan Ohio, 428 asphalt, Illinois, 211 Formation, Ohio, 411, 412, 413 Alger County, Michigan, 277 Asphalting, 246 Bethany Falls Limestone Member, Algonquin age, Michigan, 286, 287 Asterobillingsa, 114 Swope Formation, Missouri, Allamakee County, Iowa, 81, 83, 84 Astrohippus, 26 135, 138 Allegheny Group, Ohio, 407 Atherton Formation, Indiana, 352 Bethany Falls Limestone, Iowa, 123 Allen County, Indiana, 328, 329, 330 athyrids, Iowa, 111 Betula, 401 Allensville
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