References
- Geol. Mag. , iv 241 – 241 . dec. 2
- Geol. Mag. , i 302 – 302 . dec. 2
- Der Jura, Atlas , 48 f. 6.
- Hayden's Final Report on Nebraska , 9 f. 11, f, g.
- Geol. Mag. , iv 242 – 242 . dec. 2
- Iron Ores Gt. Brit. , 221 – 221 . pt. 3
- Brit. Pal. Foss , 512 – 512 .
- 1876 . l. Theil , 44 f. 13, c.
- Brit. Pal. Foss. , 512 – 512 .