170 THE DEVONIAN OF MISSOURI. 



Feet. 

 9. Limestones and calcareo-argillaceous shales with profusion of corals and 



brachiopods 75 



8. Soft calcareous shales * * very rich in Leptaena rhomboidalis 20 



7. Compact limestone beds overlying the eruptive; contains corals and other 



fossils 7 



Volcanic boss * * near the middle of which lies a 

 6. detached mass of hardened and glazed calcareous shale * * 30 feet 



in transverse thickness, 15 feet in height * * This mass contains corals 



and brachiopods 30 



5. Compacted gray blocky limestone 10 



4. Coarse conglomeratic ash bed 12 



3. Hard blocky yellowish gray argillaceous limestone 40 



2 Gray to yellowish hard calcareous shales with thin beds of limestone 125 



1. Calcareous shale with Sieberella pseudogaleata, Leptaena rhomboidalis and 



in the lowest stratum corals * * No contact metamorphism 30 



Volcanic boss * * overlain by" 



