203 
SILURIAN IN NORTH WALES. 
1. 
Fig. 2.—Section near Gelligrin, South of Bala Lake. 
Fine shales passing up into barren shales. 
Ormoceras?, Leptena sericea, Orthis ele- 
gantula, 
Coarse sand: Orthis calligramma (large), 
O. Actonie, Strophomena depressa, St. de- 
pressa, var. undata, Lingula ovata, Pa- 
learca( Modiolopsis)modiolaris, Modiolopsis 
pyrus, Discina sp., Conularia Sowerbyi, 
Favosites (Stenopora) fibrosus. 
Crystalline Limestone with fossils, 18 feet 
to 20 feet. 
Same character and fossils as no. 2. 
Sandy shales, with Asaphus Powisii (com- 
mon), Homalonotus Cybele, Calymene, Pha- 
ISLET | fe a ~~. 
WHEL 's1) 
| Vif RNS ENS 
Ls [fpf AWN NNZ 
Ly ANAM 
7 
cops apiculatus, Encrinurus,Lichas laxatus, 
Trinucleus concentricus, Orthis Actonie, 
O. calligramma, O. elegantula, Bellerophon 
bilobatus, Rhaphistoma, Leptena sericea, 
Crania divaricata, Beyrichia complicata. 
6. Sandy limestone (=bed at Garnedd, =bed 
described by D.C. Davies, Quart. Journ. 
Geol. Soc., Aug. 1875) : Orthis spirifer cides 
(common), O. vespertilio (common), O. ele- 
gantula, Leptena sericea, L. tranversalis, 
Strophomena depressa, St. expansa, Orthis 
biforata, O. Actonie, Cyclonema crebristria, 
Nebulipora lens, Trinucleus concentricus, 
Tentaculites anglicus. 
7. Fossiliferous ash-bed. 
8. Fine shales: Orthis elegantula, O. calli- 
gramma, O. flabellulum (scarce), Stropho- 
mena expansa, St. depressa, Lingula ovata, 
Leptena sericea, Ctenodonta obliqua?, 
Palearea obscura, Beyrichia complicata. 
9. Caleareous ash-bed: Leptena sericea 
(abundant), Strophomena expansa, Orthis 
elegantula, O. calligramma (small), 0. 
vespertilio, Enerinite-stems, Zrinucleus 
concentricus. 
10. Fossiliferous shales. 
