198 



STRATIGRAPHICAL GEOLOGY 



The following are some of the most characteristic fossils of each 

 division as found in England, France, and Belgium. 



Fossils of the Lower Devonian 



Adinozoa. Pleurodictyum problematicnm, Zaphrentis oolitica. 



Echinoderma. Cyathocrinus megastylus, Ctenocrinus decadactylus. 



Brachiopoda. Spirifer primsevus, S. auriculatns, S. cultrijugatus, 



S. paradoxus, S. hystericus, Orthis arcuata, Chonetes 

 dilatata, C. sarcinnlata, Rensellieria crassicosta, 

 Leptena laticosta, Rhynehonella daleidensis. 



Fig. 63. GROUP OF UPPER DEVONIAN FOSSILS. 



b. Rhynchonella Partridgise. 



c. Ptychopteria damnoniensis. 



e. Cucultea unilateralis. 

 /. Curtonotus elegans. 



Lamellibranchia. Pteria anisota, Pteria spinosa, Pterinsea costata, Pt. 



(Kochia) capuliformis, Ctenodonta Krachtse. 

 Crustacea. Homalonotus armatus, H. Champernowni, H. gigas, 



Dalmanites laciniatus. 

 Gastropoda. Bellerophon trilobatus, Platyceras fecundus, Macrochi- 



lina elongata. 

 Pisces. Drepanaspis gemundensis, Coccosteus angustus, Pter- 



aspis. 



Fossils of the Middle Devonian 



Hydrozoa. Stromatopora concentrica, Actinostroma stellulatuin, 



Amphipora ramosa. 



Actinozoa. Pachypora cristata, Phillipsastreea pengellyi, Meso- 



phyllum damnoniense, Cyathophyllum caespitosum, 

 C. obtortum, C. hexagonum, Cystiphyllum vesicu- 

 losum, Alveoli tes suborbicularis, Calceola saudalina, 

 Heliolites porosus. 



