PLIENSBACHIAN (LOWER JURASSIC) BIOSTRATIGRAPHY AND ...

Figures 1-4. M etaderoceras sp. cf. M . m outerdei (Frebold, 1970)
1. Figured specimen GSC 83078, la, lateral view of latex cast; lb, lateral view of whorl
fragment; lc, ventral view of whorl fragment. Joan Formation. GSC loc. C-90843
(locality 3, this report).
2. Figured specimen GSC 83079, 2a, lateral view of latex cast; 2b, lateral view of whorl
fragment; 2c, ventral view of whorl fragment. Joan Formation. GSC loc. C-103307
(locality 25, this report).
3. Figured specimen GSC 83080, lateral view. Cold Fish volcanics. GSC loc. C-l 17206
(locality 98, this report).
4. Figured specimen GSC 83081 (latex cast), lateral view. Joan Formation. GSC loc.
C-103309 (locality 7, this report).
Figures 5, 6. M etaderoceras evolutum (Fucini, 1921)
5. Hypotype GSC 83076, lateral view. Cold Fish volcanics. GSC loc. C-81970 (locality 96,
this report).
6. Hypotype GSC 83077, 6a, lateral view; 6b, ventral view. Cold Fish volcanics. GSC loc.
C-81970 (locality 96, this report).