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A TREATISE ON GEOLOGY.
CHAP. VI.
| Hamites. Turrilites. | Cretaceous System. | |||
| Megalosaurus. | Plesiosaurus. Ichtyosaurus. Ammonites. Belemnites. Trigona. Stellerida. Cidaris. |
Wealden Formation. | Spirifera. | Clypeus. Apiocrinus. |
| Upper Oolite Formation. | ||||
| Middle Oolite Formation. | ||||
| Lower Oolite Formation. | ||||
| Lias Formation. |
1. Gryphæ dilatata. Sowerby. From the Kelloway rock and Oxford clay.
2. Gryphæ incurva. Sowerby (G. arcuata, Schlotheim.) From the lias.
3. Glyphia rostrata. Phillips. From the lias, lower oolite, and middle oolite formations.
4. Nucleolites clunicularis. Llwyd. From the lower and middle oolite formations.
5. Cardium truncation. Sowerby. From the marlstone beds in the lias formation.
