SECTION A 



151 



3. Phacops rana Green. 



4. Cryphxus boothi Green. 



8. Primitiopsis punctulifera (Hall). 



12. Goniatites cf. uniangularis Conrad. 



Orthoceras sp. 



19. lentaculites attenuatus Hall, var. 



40. Aviculopecten princeps (Conrad). 



60. Stropheodonta concava Hall. 



61. Stroph. demissa (Conrad). 



62. Stroph. inequistriata f (Conrad). 



64. Pholidostrophia iowaensis (Owen^. 



65. Leptostrophia perplana (Conrad). 



68. Orthothetes arctostriata Hall. 



69. 0. perversa Hall. 



71. Chonetes lepida Hall. 



81. Pentamerella papillionensis Hall. 



87. Leiorhynchus laura (Bill.). 



97. Atrypa reticularis (Linn.). 

 105. Spirifer mucronatus var. thedfordensis 



S. and G. 

 107. S. cf. consobrinus d'Orbigny. 

 118. Athyris fultonensis (Swallow). 



137. Paleschara f sp. 



138. Streblotrypa hamiltonensis (Nich.). 

 155. Fistulipora utriculus Rominger. 



206. Ceratopora intermedia (Nicholson). 



207. C. nobilis (Billings). 



Figure 1. — Section A— One Side of Railroad Cut near Thedford. 

 Figures as in text. For scale see figure 4. 



8 and 7. Gray calcareous shale full of Spirifer mucronatus var. thedfordensis, 

 which appears to be mostly confined to a stratum 4 feet thick 

 in the lower bed 8 ; (8a) 10 feet 



The following species were found on the talus slope, and probably 

 belong to beds 7 and 8 : 



8. Primitiopsis punctulifera (Hall). 71. Chonetes lepida Hall. 



10. Barychilina walcotti Jones. 87. Leiorhynchus laura Bill. 



36. Pleurotomaria cf. arkonensis Whiteaves. 105. Spirifer mucronatus var. thedford- 



60. Stropheodonta concava Hall. ensis S. and G. 



