There are 15 matches
| Collection | Authorizer | Collection name | Reference |
|---|---|---|---|
| 23436 | S. Holland | Grand Detour Formation Echinoderms, Upper Mississippi Valley Blackriveran - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23445 | S. Holland | Nachusa Formation Echinoderms, Upper Mississippi Valley Blackriveran - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23449 | S. Holland | Quimbys Mill Formation Echinoderms, Upper Mississippi Valley Blackriveran - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23457 | S. Holland | Guttenberg Formation Echinoderms, Upper Mississippi Valley Rocklandian/Kirkfieldian - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23460 | S. Holland | Ion Formarion, Buckhorn Member Echinoderms, Upper MIssissippi Valley Kirkfieldian - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23465 | S. Holland | Ion Formation, St. James Member Echinoderms, Upper Mississippi Valley Kirkfieldian - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23472 | S. Holland | Dunleith Formation, Mortimer Member Echinoderms, Upper Mississippi Valley Shermanian - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23477 | S. Holland | Dunleith Formation, Sherwood Member Echinoderms, Upper Mississippi Valley Shermanian - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23481 | S. Holland | Dunleith Formation, Wall Member Echinoderms, Upper Mississippi Valley Shermanian - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23486 | S. Holland | Dunleith Formation, Wyota Member Echinoderms, Upper Mississippi Valley Shermanian - Ordovician 4-5 - Illinois, Iowa | Kolata et al. (1987) |
| 23490 | S. Holland | Wise Lake Formation, Sinsinawa Member Echinoderms, Upper Mississippi Valley Edenian - Ordovician 5 - Illinois, Iowa | Kolata et al. (1987) |
| 23492 | S. Holland | Wise Lake Formation, Rifle Hill Formation Echinoderms, Upper Mississippi Valle Edenian - Ordovician 5 - Illinois, Iowa | Kolata et al. (1987) |
| 23521 | S. Holland | Scales Shale, Elgin Member Echinoderms, Upper Mississippi Valley (Illinois Iowa) Edenian/Maysvillian - Ordovician 5 - Illinois, Iowa | Kolata et al. (1987) |
| 23522 | S. Holland | Scales Shale, Clermont Member Echinoderms, Upper Mississippi Valley (IL, IA) Maysvillian - Ordovician 5 - Illinois, Iowa | Kolata et al. (1987) |
| 23524 | S. Holland | Fort Atkinson Limestone Echinoderms, Upper Mississippi Valley (Illinois, Iowa) Maysvillian - Ordovician 5 - Illinois, Iowa | Kolata et al. (1987) |