Fig. 1. COCCOLITHS... 
Fig. 2. RHABDOLITHS 
Figs. 3 to5. RADIOLAR 
Figs. 10 to 14, 16. Undetermined 
Fig. 15. Fragment of tooth of fish 
Fig. 33. PULVINULINA 
PLATE. E. 
PAGE. 
Perey Dee eva A ATEN SYST aV day okelarelnietetatstoie te okelsreholevs cvardvesetelaeleteversYorstoreLercieastemetateKsveratenctetetetererreiacte 49 
Saeco nonin cone UbnnO GoD OtoE oftcnsenodasoUddnnd cauTonoobanmdonahoannaeaenao none 49 
TAC MANN esotacand Ml llin Oi Steves ncmcue che apecses th eeutain ohaetelcio asic ora ieeiersrete 50 
Figs. 6 to 9. RADIOLARIA. Minnesota and Nebraska. ........-.-..0-+e+se cscs cece eee eee ee cence ee 50 
RAR An Uh ENE Ra eRe GR Pochh sara nd Homo oEa ADO mae aoe CSUS 51 
CPs MMM SC Ett acd Un Sg See ct ane, Re So RARE meee eS ae Re 51 
Figs. 17 to 22. Sponge spicules. Nebraska. ...........-..22 25 s0e 2 cee ceee eee ee tec eee e eter eee 51 
Figs. 23 to 29. Sponge spicules. Minnesota .....-. ...-..: 00s ee seee eee eee cee terete ee cece ee eee es 51 
Figs. 30 to 32. SparaNneus (Echinodermata) spicules. Nebraska........-... 22. .... sees sees eee 51 
MENARDII @’Orbigny. Nebraska. Inferior aspect.........................- 45 
Fig. 34. PuLVINULINA HAUERI d’Orbigny. Minmesota............20.-- 002s cece ee ee cece tee ete e ee 44 
Figs. 35 and 36. NONIONINA SCAPHA Fichtel and Moll, sp. Calumet, TMWinOis: jeenincesn doesn cs 48 
Figs. 37 tc 389. OPERCULINA COMPLANATA Defrance..........-. 5s. sees e cette ee tees eee e nee ne nees 45 
Fig. 38. OPERCULINA COMPLANATA, Var. GRANULOSA Leymerie 
