SECTION E 



159 



212. Cladopora frondosa (Bill.). 227. 



213. Cladopora roemeri (Bill.). 229. 



214. Striatopora linneana Billings. 230. 



216. Roemeria ramosa Whiteaves. ' 231. 



217. Favosites digitata Rominger. 233. 



218. F. placenta Rom. 



219. F. clausa Rom. 237. 



220. F. turbinate, Bill. 238. 



221. F. billingsi Rom. 241. 



225. Zaphrentis prolifica Billings. 



226. Cyathophyllum cf. zenkeri Bill. 



Cyathophyllum conatum Hall. 



Heliophyllum exiguum Bill. 



H. halli E. and H. 



H. tenuiseptatum Bill. 



Craspedophyllum subcsespitosum Nich- 

 olson. 



Cystiphyllum vesiculosum Goldfuss. 



C. conifolle Hall. 



Astrseospongia hamiltonensis M. and 

 W. 



In the Encrinal limestone Spirifer sculptilis Hall and Favosites turbinata 

 Billings were found. 



The following list of species was obtained from the lowest beds in this 

 section : 



3. Phacops rana Green. 74. 



12. Goniatites uniangularis Conrad. 87. 



13. Bactrites obliqueseptatus var. arkonense 104. 



Whiteaves. 



19. Tentaculites attenuatus Hall (var.). 111. 



24. Platyceras bucculentum. 



27. PL arkonense S. and G. 163. 



32. Diaphorostoma lineata (Conrad). 196. 



61. Stropheodonta demissa (Conrad). 



64. Pholidostrophia iowaensis (Owen). 223. 



Chonetes scitula Hall. 



Leiorhynchus laura Bill. 



Spirifer mucronatus var. arkonensis 

 S. and G. 



Cyrtina. hamiltonensis Hall. 



Crinoidal joints. 



Hederella canadensis (Nich.). 



Arthroacantha punctobrachiata Wil- 

 liams. 



Microcyclus discus M. and W. 



were found in the talus, and probably came from the 



The following 

 coral layer : 



1. Aspidychthus notabilis Whiteaves. 112. 



3. Phacops rana Green. 118. 



52. Paracyclas lyrata (Conrad), probably 148. 

 from the lower shales. 



79. Rhipidomella penelope Hall. 206. 



80. Rhipidomella vanuxemi Hall. 217. 

 85. Camarotcechia horsfordi Hall. 225. 

 97. Atrypa reticularis (Linn.). 231. 



105. Spirifer mucronatus var. thedfordensis 237. 

 S. and G. 



Cyrtina hamiltonensis var. recta Hall. 

 Athyris fultonensis (Swallow). 

 Polypora arkonensis S. A. Miller. 

 Fistulipora sp. 



Ceratopora intermedia (Nich.). 

 Favosites digitata Rom. 

 Zaphrentis prolifica Bill. 

 Heliophyllum tenuiseptatum Billings. 

 Cystiphyllum vesiculosum Goldfuss. 



Discussion and Correlation 

 discussion 



Calvin in 1888 called attention to the three-fold division of the Ham- 

 ilton beds in the Thedford region. He considered the thickness of the 

 beds accessible to observation to be 200 or 250 feet, and noted the fact 



