SECTION D 



155 



5. Calcareous shales and shaly blue limestones containing Phacops rana. . 6 feet 



4. Argillaceous limestone 1 foot 



3. "Coral layer," a shaly and somewhat calcareous rock, full of fossils, 



among which Heliophyllum and Cystiphyllum predominate 3£ feet 



Figure 4.— Section D—Wall of Rock Glen, near Arkona. 

 Figures as in text. 



