Clinton iana bed at Iron Ridge Wisc. Wykoff Formation 14. Artus bed at Spring Valley Minn. Artus occidentalis Leptaena micranta typical Phynchonella antecrenosis. (30 ft) 13. Leptaena bed, West of Wykoff Minn. Artus antegradata (10 aler) (30 ft) Plectambrites recedens Sand 14 aler Phynchonella palamellera =Willmington Del. fauna. 12 Certocerias bed, Ironwood Co. 5 mo. Certus emacerata (25 ft) Wurdwaria milleri Aterdenta calvini Clas disjunctus sp. Artus ceras Cyrsceras Diplograpthus Artus Kauka Kaurasi Artus incarsulpta Artus antegradata Strig. micra trilobita 11 aler =Flexuosa Ordbyrgy. 11 11. Diplograpthus bed, Orange Minn. Oraphtus 3 species. Pelleroplene lobatus Artulites oratus Crundaria Diplograpthus Gryphula. Last two, 11 + 12 = Magneskata Formation. 10. Triplea bed, Scales Mound, Ill. Tripleura ulrichi (30 ft) Plectambrites praecoxa Artus antegradata Artus Kaukaurasi. 9. Machnera bed Machnera conneeta, (35 1/ft) 8. Hyngelclas iana bed. (Spr 5) Syngdelasma galeneves (30-35 ft) " burkharti Plectambrites gibba, 7 Camarella bed. Strigelmere trilobita finm 30 ft) lure up, zagrapta ulchami' 6. Artus iama bed. (40 ft) Artusiina americana. Plectambites annucenturus. 5. Fucoid bed 18 ft) Chaetetes lyciferum Prasopra armingera Plectambrites sericea Artus orba squata Phynchonella or subrecto viaequivalve, Prasspina