XXV1 THE PALEONTOLOGY OF MINNESOTA. 
Grayish buff-colored magnesian limestone, with numerous casts of fossils. Thickness not given. 
Ash-colored argillaceous hydraulic limestone, sometimes with conchoidal fracture. No fossils 
observed. Thickness 5 feet. 
3. Ash-colored limestone, clouded with blue, full of fossils. Contains about 65 per cent. carbonate 
of lime. Thickness, 15 feet. 
Nw = 
In the appendix, Article III, p. 598, is a short discussion of the tables showing the 
distribution of the fossils collected by Dr. Owen’s survey. The following thirty-seven 
‘‘may be referred to species distributed through the Trenton limestone, Utica slate and 
Hudson River group of New York, as follows: 
Chetetes lycoperdon. Leptzna alternata. 
Conularia trentonensis. Lepteena sericea. 
Ambonychia undata. Leptzna deltoidea. 
Ambonychia amygdalina. Atrypa hemiplicata. 
Nucula levata. Atrypa modesta. 
Bellerophon bilobatus. Atrypa capax. 
Pleurotomaria lenticularis. Spirifer biforatus. 
Pleurotomaria subconica. Orthis testudinaria. 
Pleurotomaria umbilicata. Orthis tricenaria. 
Subulites elongata. Lingula quadrata. 
Murchisonia subfusiformis. Echino-Encrinites anatiformis. 
Murchisonia bellicincta. Heterocrinus heterodactylus. 
Murchisonia tricarinata. Calymene senaria. 
Cyrtoceras macrostomum. Tsotelus gigas. 
Orthoceras vertebrata. Hilenus crassicauda. 
Orthoceras laqueatum. Ceraurus pleurexanthemus. 
Orthoceras junceum. Phacops callicephalus. 
Leptzena planumbona. Lichas trentouensis. 
“One species, Gonioceras anceps, is peculiar to the Black River limestone; one, the Orthoceras 
multicameratum, to the Birdseye limestone; and Maclurea magna, to the Chazy limestone.” 
In addition to the foregoing his tables also contain the following, referred to the 
“Shell beds” or Trenton limestone. 
Asaphus iowensis. Orthoceras undulostriatum. 
Illeenurus ovalis. Campulites arcuatus (?) 
Bumastus barriensis. Endoceras proteiforme. 
Lituites undatus. Endoceras subcentrale. 
Lituites convolvans. Trocholites ammonius. 
Cyrtolites ornatus. Orthis subsequata. 
Cyrtolites compressus. Orthis subquadrata. 
Ambonychia orbicularis. Orthis occidentalis (?) 
Orthis bellarugosa. Leptzna deflecta (?) 
Orthis sinuata. Leptzna recta. 
Orthis disparilis (?) Leptena trilobata. 
Orthis perveta. Selenoides iowensis. 
The following are referred to the age of the Utica slate: 
Asaphus iowensis. Bellerophon bilobatus. 
Cyrtoceras conicum. Ambonychia obtusa. 
Campulites ventricosum. Spirifer lynx. 
Trocholites ammonius. Spirifer lynx, var. biforatus. 
Maclurea magna. Orthis testudinaria. 
Pleurotomaria lenticularis. Leptena alternata. 
Murchisonia bellicincta. Leptzna sericea. 
Murchisonia abbreviata. Atrypa hemiplicata. 
Murchisonia subfusiformis. Atrypa capax. 
Murghisonia tricarinata. Lingula quadrata. 
The following are referred to the age of the Hudson River group. 
Calymene senaria. Endoceras cuvieri. 
Cyrtoceras macrostomum. Pleurotomaria subconica. 
Orthoceras vertebrale. Pleurotomaria bilex. 
